Posts filed under Neurology

Management of Myasthenia Crisis in the ED

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Written by: 
Kumar Ghandi, MD (NUEM PGY-3) Edited by: Arthur Moore, MD (NUEM Alum ‘18) Expert commentary by: Luke Rosiere, MD (NUEM Alum ‘12)


What do I need to know about myasthenia gravis?

Myasthenia gravis is the most common disorder of neuromuscular transmission. The disease can manifest as a combination of weakness in ocular, bulbar, and most importantly respiratory muscles. Myasthenia gravis is disease of the neuromuscular junction, in which autoantibodies are directed against nicotinic acetylcholine receptors (AChR) located on the postsynaptic end plate. These autoantibodies not only induce complement mediated destruction of receptors, but compete with acetylcholine for binding at the remaining receptors [1]. 

 
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In over 50% of cases myasthenic patients present with ocular symptoms including blurred vision, ptosis, diplopia. 15% of patients present with bulbar symptoms including ptosis, dysarthria, dysphagia, and fatigue when chewing [2]. Isolated respiratory failure is a rare sign. It is important to remember that myasthenic patients will often present specific muscle complaints and not a generalized muscle fatigue [2].

What is myasthenic crisis?

Acute myasthenic Crisis is defined as acquired myasthenia gravis severe enough to require intubation and mechanical ventilation [3]. Typically, between 10-20% of myasthenia gravis patients will experience an episode of myasthenic crisis, most commonly within the first two years [4].

 

Myasthenic Crisis vs. Cholinergic Crisis

Though cholinergic crisis is a quite rare it is important to differentiate cholinergic crisis from myasthenic crisis in the early evaluation of these patients. Cholinergic crisis is precipitated by excess use of cholinesterase inhibitors. This can manifest as both nicotinic and muscarinic toxicity. Nicotinic symptoms include weakness and fasciculations, while muscarinic symptoms include diaphoresis, tearing, increased oral secretions, diarrhea, and bradycardia [4].

 

What can trigger myasthenic crisis?

Common triggers for myasthenic crisis include infection, surgical intervention (thymectomy), pregnancy, childbirth, or tapering of immunosuppressive medications [5]. Medications are another large source of triggers for myasthenic crisis [1] [3] [6]. 50% of patients who receive treatment with high dose corticosteroids develop an early exacerbation and 10% will go on to require mechanical ventilation [6].

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What are the priorities of management of myasthenic crisis in the ED?

The tried and true emergency medicine axiom of Airway, Airway, Airway is critical for the management of myasthenic patients. Recognition of impending respiratory arrest, early intubation, and placement of a definitive airway has reduced mortality from 40% in the 1960’s to less than 5% today [7]. Evaluation of respiratory function and airway management for patients in myasthenic crisis presents multiple unique challenges in the ED.

 

How do I best assess respiratory function in the emergency department?  

Signs and Symptoms

Patients may describe dyspnea when laying flat. This is thought to be secondary loss of diaphragmatic excursion due to increased dependence of gravity during a myasthenic crisis [4]. Patients may also demonstrate severe dysphagia, with weak cough and inability to clear secretions. Other signs respiratory weakness includes, pausing mid-sentence to take a breath, use of accessory muscles, and tachypnea with shallow breathing [3]. A simple bedside evaluation includes having a patient take a deep breath and count out loud to twenty-five. If they are unable to reach five without pausing for a breath the patient may be bordering on respiratory failure [7].

Forced Vital Capacity

  • Assesses function of both inspiratory and expiratory muscle function.

  • Assess in both supine and sitting position as respiratory function tends to decline when supine.

  • Elective intubation should be considered for FVC <15 [1]. 

Maximal Inspiratory Pressure/Negative Inspiratory Force

  • Patient maximally inhales against a closed valve and force at the mouth is recorded.

  • Inspiration is a negative generating force, thus the more negative the value the stronger the inspiratory effort.

  • NIF of 0 to -30 cm H20 indicates profound respiratory muscle weakness.

  • Elective intubation should be considered for those with a NIF in the range of 0 to -30 [3].

Use of these tools are best utilized both in combination and serially with repeat assessment every two hours to assess for progressive respiratory failure. This data allows for objective assessment of respiratory function and assessment for the necessity of a well-controlled elective intubation.


What do I need to consider before intubating?  

Neuromuscular Blockers in Myasthenia Gravis:

Due to the pathophysiology of the disease, myasthenic patients due to mechanism of disease are typically resistant to neuromuscular blockade with depolarizing neuromuscular blocking agents such as succinylcholine. Due to the decreased number of receptors myasthenic patients typically require 2.6 times the dose [8]. In addition, use of cholinesterase inhibitors typically used to treat myasthenia gravis can prolong the effect of succinylcholine.

Though succinylcholine is still considered a safe agent, higher doses and inhibition of metabolism can lead to an unpredictable and lengthy paralysis. Typically, a non-depolarizing agent such as rocuronium is the preferred paralytic drug of choice. Myasthenic patients can be sensitive to non-depolarizing agents, starting at 0.1 to 0.2 mg/kg can often provide sufficient neuromuscular blockade [8].

Ventilator Settings:

Initial setting on the ventilator include:

  • AC/VC mode

  • Tidal volumes of 8-10 cc/kg of ideal body weight

  • PEEP 8-15cm H20 to prevent atelectasis and minimize work of breathing [4].

Can I use NIPPV to prevent intubation in myasthenic crisis?

Noninvasive ventilation has previously been shown to prevent intubation in patients in myasthenic crisis. Up to 20% of patients with myasthenic crisis could potentially be managed with non-invasive ventilation. Given the propensity for difficulty swallowing, these patients must be able to protect their airway and manage their secretions in order for NPPV to be a safe alternative. Early NIV has been shown to be associated with reduction in days of ventilator support, length of stay in the ICU, and rate of reintubation [9].

 

Disposition and Post Emergency Department Care

It is critical to alert Neurology early in the course of a possible myasthenic crisis. Often, myasthenic patients are well known to the department of Neurology, as these patients often frequent the hospital for mild exacerbations of myasthenic symptoms. Myasthenic crisis patients often require close observation in an ICU given their high risk for respiratory failure or need for ventilator management. Treatment options once leaving the ED often include, plasma exchange (PLEX) or intravenous immunoglobulin (IVIG). The table below serves as an excellent comparison for PLEX vs IVIG, knowing the modality of choice from the Emergency Department can help determine the vascular access needed to perform each modality [4]. 

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Expert Commentary

Myasthenic crisis is such a great topic.  I can't think of another case that employs such a breadth of expertise.  

While it is most exciting to talk about how to manage a patient in crisis, it can't be understated how critical we are in preventing such a crisis.  Look closely at that list of precipitating medications.  At least half of those are on my Top 20 most common prescription list.  Myasthenia is like prolonged QT.  If you don't think twice about your therapies, you can put this patient in a heap of trouble and plant them in the ICU for 2 weeks.  So, first thing I can say is, if you ever see myasthenia gravis on a PMH, whether they're there for a UTI or a hang-nail, think twice and three times about every medication you write for (including IV contrast).

When it comes to the recognition and management of a crisis, the above description is great.  

As you would suspect by the word "crisis," this won't be subtle.   

I'll add the following bullets:

1)  Great patient to monitor with continous capnography.  It will be your quickest indicator of deteriorating ventilation.

2)  Keep myasthenia in your differential for any undifferentiated hypercarbic respiratory failure.  Before you paralyze and intubate, try and get a brief history and physical to assess for intermittent weakness, bulbar nerve palsies, etc.  Otherwise, this potential diagnosis may be missed for days until they can get this patient off the vent

3)  Non-invasive ventilation sounds great, but probably won't help that much.  These crises last for days, and you can't keep a mask on for that long.  These patients often have dysphagia, so will aspirate.  Many patients have excess secretions that are better managed through an endotracheal tube.  If they need positive pressure, you're best off securing the airway before it's full of vomit.

4)  Succinylcholine 2 mg/kg or rocuronium 0.6 mg/kg.  Anesthesia literature often recommends puny doses (if any at all) of NMBAs.  They're expecting to extubate that patient in 3 hours and fear prolonged paralysis.  We are expecting them to be on the vent for days.  You need to ensure you have adequate intubating conditions, and paralytics will help.  Don't forget to keep your patient well-sedated if you think they're still paralyzed.

5)  We're not expected to decide how to cure this crisis.  Call neurology and they'll tell you their preference.  You'll probably start steroids and they'll decide if they want IVIg or plasma exchange.  None are going to work in 5 minutes anyway, so they can deliberate a little.

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Luke Rosiere, MD

Northwestern University Emergency Medicine Class of 2012; Attending Physician at Northwestern Medicine Central DuPage Hospital


How To Cite This Post

[Peer-Reviewed, Web Publication]  Ghandi K, Moore A (2018, November 5). Management of Myasthenia Crisis in the ED.  [NUEM Blog. Expert Commentary by Rosiere L]. Retrieved from http://www.nuemblog.com/blog/myasthenia


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Resources

  1. Adams, James, and Erik D. Barton. Emergency medicine: clinical essentials. Philadelphia: Elsevier Saunders, 2013. Print.

  2. Clinical Manifestations of Myasthenia Gravis . (n.d.). Retrieved April 19, 2017, from https://www.uptodate.com/contents/clinical-manifestations-of-myasthenia-gravis

  3. Myasthenic Crisis . (n.d.). Retrieved April 21, 2017, from http://www.uptodate.com/contents/myasthenic-crisis

  4. Wendell LC, Levine JM. Myasthenic crisis. Neurohospitalist 2011; 1:16.

  5. Berrouschot J, Baumann I, Kalischewski P, et al. Therapy of myasthenic crisis. Crit Care Med 1997; 25:1228.

  6. EM:RAP. (2015, September). Retrieved April 20, 2017, from https://www.emrap.org/episode/september/drugsnottousein

  7. EM:RAP. (2006, January). Retrieved April 21, 2017, from https://www.emrap.org/episode/january2006/myasthenia

  8. Anesthesia for the patient with myasthenia gravis. (n.d.). Retrieved April 19, 2017, from http://www.uptodate.com/contents/anesthesia-for-the-patient-with-myasthenia-gravis

  9. Seneviratne J, Mandrekar J, Wijdicks EF, Rabinstein AA. Noninvasive ventilation in myasthenic crisis. Arch Neurol. 2008;65:54–58 

 

Posted on November 5, 2018 and filed under Neurology.

The PATCH Trial

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Written by:  Andrew Berg, MD (NUEM PGY-3) Edited by: Ryan Huebinger, MD, (NUEM Grad 2017) Expert commentary by:  Stephen Trevick, MD


Intro:

Hemorrhagic strokes, while accounting for less than 20% of incident strokes, contribute to half of all stroke-related deaths and long-term disability, totaling up to 47 million life-years lost [1]. Unlike ischemic strokes which have the potential to be intervened upon, non-surgical treatment of hemorrhagic stroke is limited. Hemorrhagic stroke associated with the use of non-reversible antiplatelet agents can be problematic, and the goal should be to try to limit the extent of the hemorrhage. In this day and age of increasing myocardial ischemia, percutaneous coronary intervention, and ischemic stroke leading to increasing antiplatelet usage, the attempted reversal of antiplatelet agents with platelet transfusion seems like a logical step. However, it is unclear if this is efficacious (both in the short and long-term) or if there are potential harms as studies are limited. The PATCH Trial looked at the use of platelet transfusion after acute spontaneous intracerebral hemorrhage in people taking antiplatelet therapy to determine if there was any impact on long-term functional outcomes.


The Study:

Baharoglu, M. Irem, et al. "Platelet transfusion versus standard care after acute stroke due to spontaneous cerebral haemorrhage associated with antiplatelet therapy (PATCH): a randomised, open-label, phase 3 trial." The Lancet 387.10038 (2016): 2605-2613. 


Study Design:

This was a 6-year multicenter (60 hospitals in Europe), parallel-group trial that randomized 190 patients with non-traumatic supratentorial intracerebral hemorrhage while on antiplatelet therapy to standard care or standard care plus platelet transfusion and performed both an intention-to-treat and as-treated analysis of the outcomes.


Population: 

Inclusion criteria:

  1. 18 years or older with non-traumatic supratentorial intracerebral hemorrhage confirmed by brain imaging
  2. Glasgow Coma Scale ≥ 8
  3. Platelet transfusion could potentially be initiated within 6 hours of symptom onset and within 90 minutes of brain imaging
  4.  On antiplatelet therapy with either a COX inhibitor (aspirin or carbasalate), ADP receptor inhibitor (clopidogrel) or an adenosine-reuptake inhibitor (dipyridamole) for at least 7 days prior to the ICH.
  5. Pre-ICH mRS (modified Rankin Score) score of 0 or 1 only, suggesting no prior disability.

Exclusion criteria:

  1. Imaging findings suggestive of epidural or subdural hematoma or those needing surgery within the next 24 hrs of admission
  2.  Imaging suggesting underlying aneurysm or AVM
  3.  Prior adverse reaction to platelets
  4.  Use of a vitamin K antagonist
  5.  Known coagulopathy
  6. Imminent death

 

Patient selection flow chart: 

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Intervention protocol: 

The patients were randomized to either standard care or standard care plus platelet transfusion. Both groups had a repeat brain imaging 24 hours after intervention.

Standard care was not defined in the protocol, but was assumed to be given according to contemporary European and national guidelines.

Platelet transfusions were initiated within 6hrs of intracerebral hemorrhage symptom onset and within 90 min of diagnostic brain imaging.  Those patients on clopidogrel received 2 units of platelets, all others received one unit as determined by in-vitro experiments. 

Outcome Measures

The primary endpoint was difference in functional outcome at 3 months after randomization scored with the mRS, as was done for the inclusion criteria, which was scored by a physician or nurse not involved with the medical treatment. Secondary clinical endpoints further stratified these outcomes into survival, poor outcome defined as mRS of 4-6 and poor outcome defined as mRS of 3-6. Another secondary outcome was median absolute intracerebral hemorrhage growth in mL after 24 hours on brain imaging. Safety outcomes and other serious adverse events were also recorded.

Results

For the primary endpoint of functional outcome difference at 3 months, there was an increase in odds toward death or dependence at 3 months in those that received platelet transfusions, both adjusted and unadjusted (adjusted common OR 2.05, CI 1.18-3.56, p=0.0114). Secondary analysis and serious adverse events are listed in the following graphs:


Interpretation

For the primary outcome, there was increased odds of a poorer functional outcome after 3 months among those who received platelet transfusions compared to those who just received standard care. In the secondary analysis (which stratifies these functional outcomes further into smaller categories), showed there was a significant poorer outcome at 3 months within the mRS 4-6 category (higher disability) for those that received platelets. All the other subcategories were insignificant. Median ICH growth did not differ significantly between the two groups at 24 hours. Among the serious adverse events, the only minimally significant difference was an increased odds of an adverse event due to ICH as a whole in the platelet transfusion group, though this may be explained by differences in the baseline characteristics of the different arms of the study.

Strengths

  • While there was some crossover between the two study arms, there was an intention-to-treat analysis as well as an as-treated analysis.
  • Follow-up was strong without attrition.
  • The physician/nurse that performed the mRS after 3 months was blinded to randomization.
  • Their intended inclusion/exclusion criteria were strong.

Weaknesses

  • Looking at the baseline characteristics, there were several patients included in the trial that should have been excluded by criteria (GCS <8, infratentorial ICH location, etc).  
  • Even though the paper states that the baseline patient characteristics were balanced between the two arms, it appeared that as a whole, the patients who were randomized to receive platelets were sicker (lower GCS, more patients with ICH volume >30mL, both the infratentorial ICH patients).
  • The majority of patients were on a COX inhibitor (>90% of patients), with very little representation of the other antiplatelet agents
  • This study could have been strengthened with platelet function testing to evaluate for modified treatment effect.

Internal/external validity

External validity could be questioned as this study presumably included only European patients (although race was not specifically mentioned). This study also likely cannot be generalized to non-COX inhibitors given how few patients were on ADP inhibitors, such as clopidogrel.

Internal validity is questioned with the inclusion of patients who met exclusion criteria and should have been excluded. The authors comment on this being an issue for several emergency-department studies given situational urgency.

Future Directions

Given the high prevalence in use of Plavix or Ticagrelor, there should be a study that includes more ADP inhibitors.


Summary: 

  • This was a European multi-center randomized trial comparing the functional outcomes of patients with spontaneous intracerebral hemorrhage on antiplatelet therapy, when they received either standard care or standard care plus platelet transfusion.
  •  The study included 190 patients from either Netherlands, UK or France.
  •  Their results indicated that platelet transfusion did not benefit patients from a functional outcome after 3 months, and in fact, may be associated with worse outcomes. Although there were several weaknesses in the study’s execution, these results seem to be significant enough to have some validity.
  • There was no difference in reported/observed immediate (<24 hour) outcomes on imaging between the two groups

Expert Commentary:

ICH is a devastating disease, and often one which we often must watch powerlessly, despite the acuity of presentation.  One of the first goals in ICH management is to prevent further bleeding.  Platelets for aspirin reversal seemed promising, since it has been documented that patients on aspirin have more hematoma expansion and worse outcomes, as well as clear anecdotal evidence from surgeons that platelet infusion in aspirin users makes an overt difference intra-op.  So why should PATCH have been negative?

Given the complexity of factors leading to hematoma expansion and subsequent hospitalization, it is hard to drive outcomes with any one intervention.  However, even the rate of hematoma expansion was unchanged.  Even though the irreversible binding of Aspirin usually takes many days to wash out, serum half-life is about 15-20 minutes (with active metabolites lingering a few hours).  One thing to remember is that transfused platelets themselves can have time-limited efficacy due to immune-related consumption and inactivation.  While even a temporarily effective transfusion can help stop brief bleeding such as in the OR or during acute stabilization, it is unlikely to prevent the stuttering hematomal expansion of ICH.

Platelets, unlike other blood products, must be stored at room temperature.  Therefore, platelet transfusions are associated with high risks of transfusion reactions.  It is theorized that some platelets may become activated prior to transfusion and can therefore also be associated with a risk of pathological clotting.  These factors could blunt any potential benefit of treatment.

Intracerebral hemorrhage is a rarer and more heterogenous illness than stroke or MI.  This trial is as high of quality as we are likely to obtain on the topic.  When applying the results of the PATCH trial, it is important to remember that no patients with platelet counts below 100k were enrolled, so transfusions to meet that goal may still be performed.  Also, it is still acceptable to transfuse for procedures or surgery.  The study did not explore any sort of functional assays, namely Platelet Function Assay (PFA) or Platelet Aspirin Assay (PAA). 

 

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Stephen Trevick, MD

Neurocritical Care Fellow, NUEM

 


How to cite this post

[Peer-Reviewed, Web Publication]  Berg A,   Huebinger A  (2018, May 14 ). The PATCH Trial.  [NUEM Blog. Expert Commentary by Trevick, S]. Retrieved from http://www.nuemblog.com/blog/PATCH


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Resources

1. Feigin VL, Krishnamurthi RV, Parmar P, et al. Update on the global burden of ischemic and hemorrhagic stroke in 1990–2013:the GBD 2013 Study. Neuroepidemiology 2015; 45: 161–76.

Posted on May 14, 2018 and filed under Neurology.

The Migraine Cocktail: Emergency Department Management of Headaches

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Written by: Vidya Eswaran, MD (NUEM PGY-2) Edited by: Danielle Miller, MD, (NUEM PGY-3) Expert commentary by:  Seth Trueger, MD, MPH


Expert Commentary

Thanks for this great overview over ED headache management. Our approach to headaches has matured in recent years, largely because of a bunch of great studies by Ben Friedman’s group at Montefiore (COI: his brother and I were residency classmates); see Headache guidelines (he’s the first et al in the Orr paper cited above, REF); his Annals Expert Clinical Management paper [REF]; and his FOAM post at ALiEM.

My general approach to headaches:

First: Is there a dangerous cause?

Is the headache similar to their prior headaches in character, location, magnitude, timing, associated symptoms? Are there concerning features (exertional, vomiting, personal or family history of aneurysms)? Was it maximal at onset (or sudden/severe)? I find it helpful to ask: “what were you doing when it started?”; “how bad was it when it started?”; “when was it the worst?”; and only after listening for a while, I backdoor into whether it is typical for them (e.g. “it’s usually on that side and you’re nauseated when you get a headache like this…?”). I’ve gotten myself in trouble by asking up front if it’s the same as usual or “worst headache of your life” – even if they don’t mean to, patients sometimes seem like they are trying to validate why they came to the ED (to us or to themselves). Of course, none of these questions are black and white and there’s a lot of room for clinical judgment; one minor deviation from typical headache does not mandate imaging. Patients come to see us for our expertise and often find it reassuring that we’ve listened and examined them and aren’t concerned.

Second: Symptom management

Turn off the lights

Even migraines without frank photophobia often feel better in a darker room. I usually turn off the lights as soon as I walk in. No reason to wait.

Metoclopramide

Any of the dopaminergic antiemetics are effective; I generally use whichever is typically used in my ED (and doesn’t have to come from pharmacy). IM works fine if the patient doesn’t have an IV – most headache patients don’t need labs or IV fluids so no reason to start one routinely and a lot of even severe headaches are suitable for fast track. But they just don’t seem to work PO.

APAP/NSAIDs

I make sure the patient is up to their appropriate daily dosing of acetaminophen or ibuprofen; with appropriate consideration of contraindications, they might make a difference so why not? PO ibuprofen is likely as effective as ketorolac, and getting a shot doesn’t seem to have a placebo effect (if nothing else, this study is worth reading for the amazing design [REF]; summarized in an accompanying editorial on placebos [REF]).

Steroids

Steroids don’t fix the headache today but they decrease recurrence in some patients. I don’t give them to everyone, but for patients who get headaches in groups, have been having headaches for a while, or are just miserable enough, I give 10mg of dexamethasone.

No diphenhydramine

Diphenhydramine doesn’t work for headaches [208 patient RCT, REF].

Diphenhydramine doesn’t prevent metoclopramide-associated akathisia [REF; REF] (which in my experience, is much less common than the literature describes). Midazolam has some effect for prophylaxis [REF], but the rate of akathisia is low enough that I don’t think it’s worth the risks (or extending LOS due to zonking out the patient). [n.b. the same for avoiding prophylaxis for ketamine sedations; REF] If the patient gets akathisia [or an emergence reaction], then I give midaz.

I’ve heard people suggest diphenhydramine works by knocking out the patient and as any migraine sufferer knows, the best treatment is probably sleep, but the evidence suggests that diphenhydramine just doesn’t add much.

That being said, I pick my battles and I don’t knock it our of nurses hands or reprimand the residents every time or even fight with patients if they really think it helps. But never push IV Benadryl – it gets you high [REF].

No fluid

Unless the patient has been vomiting a lot or has another reason to be volume down, there is little reason to give IV fluids [REF], and in my experience, it locks the patient’s LOS into at least however long the bag takes to drip in, and of course patients who need fluids the least are most likely to have the most positional IVs….

Triptans

I’ll be honest, I don’t give triptans, except in the rare cases where patients know they work for them. Usually the patient’s already taken their home dose, and it seems like most patients have missed the window for effectiveness by the time they’re seeing me. I admit that I’m behind the science and this probably has more to do with practice patterns during my training. I’m open to being convinced.

Sleep

If the patient falls asleep and my ED has the bandwidth, I rarely wake them up. Seems worth giving up the room for a few hours for what’s essentially curative therapy for a miserable condition.

Occipital Nerve Block

If the headache is occipital and radiates forward at all, it could be occipital neuralgia, which often responds quite well to occipital nerve blocks. The diagnosis is not very scientific, but the potential treatment is very simple and, if nothing else, just takes a few minutes of my time and a little pain for the patient, which might provide them hours of relief. I recommen a bupivicaine occipital nerve block to any patient who I think could have occipital neuralgia, review the anatomy, make sure I'm not in the artery, and put in a nice dose of bupivicaine.

No opioids

Opioids don’t work for headache. I never* give opioids for headache. Don’t give opioids for headache.

That being said, the evidence base is surprisingly weak (see REF). My personal experience resonates here; I’ve had a handful of classic migraines, and some were when I was studying abroad in Australia where codeine is OTC. It made me sleepy-ish but didn’t help the headache at all, for whatever that’s worth.

*Rarely, if I see a patient with a pain contract that includes opioids for headaches from a reputable source, I don’t die on that hill.

2nd round: magnesium + (metoclopramide or haloperidol)

If the patient need a second round (or if their headache was terrible to begin with) I throw some IV mag at them. The evidence is weak at best, but it might help and is pretty safe, so why not.

I usually re-dose metoclopramide at this point, but if their current or prior headaches are generally refractory, I often switch to haloperidol (2.5mg IV or IM).

Dispo

Key points in communicating with the patient and evaluating them for discharge:

I don’t have a silver bullet to fix their headache. My goal is to make sure we’re not worried that there is something dangerous going on (“good news! we’re not”) – it’s safe to go home and we have a good, safe plan for follow up (we’re not just kicking them out). While I can’t make the headache go away completely, “my other goal is to get you to the point where you can be miserable here or miserable at home” and we can safely discharge with return instructions and follow-up; I consider Neuro or headache specialist referral if it seems appropriate.

I really think that articulating a lot of these steps is helpful. Much of what we do implicitly is not clear to the patient – our across-the-room gestalt, our assessment and thought processes. Patients want to be listened to, they want to know what to expect, they want to know what to do, and they want a doctor who cares.

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Seth Trueger, MD, MPH

Assistant Professor, Northwestern Emergency Medicine

 


How to cite this post

[Peer-Reviewed, Web Publication]  Eswaran V,   Miller D  (2018, April 30 ). The Migraine Cocktail: Emergency Department Management of Headaches.  [NUEM Blog. Expert Commentary by Trueger, S ]. Retrieved from http://www.nuemblog.com/blog/headache


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Posted on April 30, 2018 and filed under Neurology.

Emergency Guide to Neuroimaging: Part 1

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Written by: Justin Seltzer, MD (NUEM PGY-1) Edited by: Andrew Cunningham, MD, (NUEM PGY-3) Expert commentary by:  David Rusinak, MD


Neuroimaging, mainly using CT, has become an indispensable part of our emergency diagnostic process, but, all too often we rely on radiologists to interpret what we ordered. The goal of this multi-part blog is as follows:

  • To cover the basics of how to look at a CT brain and quickly identify life threat
  • Review the literature supporting the major ED indications
  • Discuss special considerations, such as when to use contrast, angiography, or MRI instead.

Systematic Reading of a CT Brain

The first portion of this blog will focus on how to read a CT brain quickly with a focus on life threats.

The classic mnemonic, “Blood Can Be Very Bad,” is a pathology oriented, step-wise method to look for blood, cistern changes, and alterations to the brain parenchyma, ventricle appearance, and bony anatomy.  Applying this approach to each image cut individually can help reveal subtle findings that would otherwise be easily missed by quick scrolling.

Blood:

Blood can collect both intra-axially (parenchymal) and extra-axially (outside the parenchyma).

Figure 1

  • Classically, spontaneous intra-axial bleeding originates in deep structures such as the basal ganglia and thalamus (Figure 1).
    • In the setting of trauma, intra-axial bleeding is often ipsilateral or directly contralateral to the injury site (coup-contrecoup) but can be anywhere
    • Inferior frontal and anterior temporal lobes are high risk for traumatic contusions due to close proximity to bone (Figure 2)

 

 

Figure 2

 
  • Extra-axial bleeding is defined by location: mainly subdural, epidural, subarachnoid, and intraventricular hemorrhages. The patterns for these are well known and readily identified, however below are some key points on extra-axial bleeding.
    • Finding chronic subdural hematomas can be difficult as older blood and grey matter are similar appearing
    • Mass effect, abnormal appearing brain folds on that side, and use of coronal reconstructions can help identify
    • Subarachnoid hemorrhage becomes difficult to see within hours to days but acutely is often observed well in the cisterns (see below)
    • Be careful not to mistake choroid or pineal calcifications for hemorrhage
    • Don’t forget about scalp hematomas

 

Cisterns:

The cisterns are not ventricles but rather outpouchings of the subarachnoid space. When evaluating a CT brain the following, certain cisterns have clinical relevance for potential herniation syndromes, layering of subarachnoid blood, and/or the significant structures that run through them. Figures 3-5 show the locations of the major cisterns described below.

Figure 3

Figure 4

  •  Suprasellar: Located in the area of the sella turcica, forms a pentagon/star shape
    • Classic location of subarachnoid hemorrhage due to proximity to circle of Willis
    •  Obliteration associated with downward transtentorial (i.e. uncal) herniation or due to severe elevated ICP
  • Perimesencephalic cistern: A group of interconnected basal cisterns surrounding the midbrain (mesencephalon), important location of subarachnoid hemorrhage, may see effacement (reduction or loss) with tonsillar herniation
    • Interpeduncular: Located in the area of the cerebral peduncles
    • Quadrigeminal: Classically forms a W shape, obliteration associated with upward herniation
    • Ambient and crural: Connections between quadrigeminal and interpeduncular cisterns
  • Cerebellopontine: Located between anterior cerebellum and lateral pons, synonymous with area of cerebellopontine angle
  • Cisterna magna: Located between the cerebellum and medulla, receives fourth ventricular CSF outflow (Figure 4)
  • Prepontine: Located at the anterior aspect of the pons

Figure 5

Brain parenchyma:

CT allows for gross evaluation of the major structures as well as a differentiation of grey and white matter by Hounsfield units. The focus here is major parenchymal disruptions.

  • Mass lesions, mass effect, midline shift: Because of the fixed nature of the skull, mass lesions of any type easily exert pressure on the surrounding tissue (mass effect) that can result in increased ICP, midline shift, and herniation.
    •  Midline shift is measured in millimeters of displacement of the septum pellucidum at the level of the foramen of Monro from the midline of the skull
  • Ischemic changes: depending on the size of the involved territory and duration, may be subtle or obvious density or architectural changes.
    • Early signs of infarction: reduced grey-white matter distinction and loss of insular hyperdensity

Ventricles:

The ventricular system is where CSF is produced and the route by which it travels into the subarachnoid space. The lateral ventricles drain via the foramina of Monro to the third ventricle, which then drains via the cerebral aqueduct (aqueduct of Sylvius) to the fourth ventricle and then to the cisterna magna and the rest of the subarachnoid space via the median and lateral apertures (foramina of Magendie and Lushka, respectively). Figures 3-5 also show the locations of the major ventricles.

  • Interruption of ventricular CSF flow will cause proximal ventricular dilation that helps localize the level of obstruction
  •  If unsure between hydrocephalus and atrophy, dilation of temporal horns of the lateral ventricles can be helpful as it occurs in hydrocephalus involving the lateral ventricles but not with hydrocephalus ex vacuo

 

Bones:

Intimate knowledge of bony anatomy is not essential fracture evaluation. However, it is crucial that the bony anatomy be viewed with a dedicated bone window. Skull and facial fractures can be subtle and the presence of blood, especially an epidural hematoma, may help localize them. As noted above, soft tissue findings such as scalp hematomas are important to rule out as well.

 


Key Learning Points and Conclusions

  • A systematic approach is essential to avoid missing significant findings, especially with complex neuroimaging—remember “Blood Can Be Very Bad”
  • Immediately look for: blood anywhere (don’t forget the scalp!), effacement of major cisterns, mass effect/midline shift, enlarged ventricles (temporal horns), skull fractures
  • Older blood, such as a chronic subdural hematoma, can be hard to find and may require different cuts or inference from mass effect or effaced sulci
  • Signs of infarction may be subtle (more on this later)

 

In the next installation, we will discuss the major indications for CT brain and the utility of CT for these indications.


Expert Commentary

Overall, this is a very nice approach to head CT interpretation.  The classic mnemonic, “Blood Can Be Very Bad,” is not something I’ve heard of before, but it works.  Let’s take each search item in turn.

 

Blood

A helpful way to think about intracranial hemorrhage is to consider the causes of hemorrhage and the most common location for each pathology.  Common causes include trauma, stroke (hypertensive or hemorrhagic conversion of a venous or arterial infarct), neoplasm (primary or secondary), vascular (aneurysm, AVM, dural AV fistula), and spontaneous (anticoagulation, amyloid angiopathy, vasculitis).  If you consider the location of each of these pathologies, the hemorrhage will typically be primarily in this location.  A tumor, for example, will cause a parenchymal bleed, a ruptured aneurysm will cause subarachnoid hemorrhage, an AVM will result in a parenchymal bleed, etc.  Often with parenchymal bleeds additional imaging, vascular and MRI, as well as follow up imaging will be necessary to determine the underlying cause.

A correction is that subacute hemorrhage, not chronic, has a density similar to gray matter.  Chronic subdural hemorrhages are usually very hypodense and easy to detect on CT. So, from a practical perspective, a patient experiencing headaches from subarachnoid hemorrhage that is greater than 3 or 4 days old may be occult by CT.  This underscores the role of lumbar puncture and vascular imaging in working up patients with headaches.

Another important concept to keep in mind is window and level when interpreting CTs. Different substances (air, metal, bone, blood, fat, etc) have different and defined densities.  The pathologies associated with each of these substances (fractures, edema in the setting of stroke, etc) can be better seen by adjusting the window and level settings.  This can be done manually or, typically, PACS viewers have preset brain, bone, lung and soft tissue windows that can be displayed by pressing different numbers on the keypad.  Subtle subdural hemorrhages are often only seen with the appropriate window and level that allows distinction of the hemorrhage from the overlying calvarium.

 

Cisterns

The blood vessels course through the cisterns, so these must be scrutinized for the presence of hemorrhage secondary to a ruptured aneurysm in a patient presenting with an atraumatic headache.  The cisterns are also effaced in the setting of mass effect. Mass effect may be from a space occupying lesion; such as a tumor, abscess, or hemorrhage; or from diffuse cerebral edema with generalized brain swelling.  Often the absence of something (i.e. patent basal cisterns) can be harder to detect than the presence of something, like hemorrhage.  It is, therefore, important to examine the basal cisterns on each case to get comfortable with their normal variation of appearance so that their absence, such as in diffuse cerebral edema, is not missed.

 

Brain parenchyma

Subtle changes in parenchymal density can be difficult to detect.  It is important to get acquainted with ideal window and level settings to uncover subtle parenchymal changes.  Also comparison with prior imaging, if available, is necessary to determine the chronicity of parenchymal findings.  Understanding where a physical exam finding localizes intracranially can also be very useful- aphasia or left upper extremity weakness localize to very different locations, for example.  Lastly, always look at the vessels in the subarachnoid space to identify hyperdense thrombus in the setting of a suspected stroke.

 

Ventricles

Distinguishing volume loss from ventricular dilatation takes experience to understand the variation of normal across the entire age spectrum.  If hydrocephalus is suspected, determining if it is obstructive or communicating can help to understand the underlying cause. The temporal horns are the most elastic portion of the ventricles and dilate first in the setting of hydrocephalus. 

 

Bones

Depressed skull fractures and easy to see on routine bone windows.  Things get complicated when subtle non-displaced fractures mimic normal sutures or if the fracture involves the skull base/temporal bones.  It is probably not within the normal ED physician’s scope of practice to have a detailed knowledge of skull base anatomy, but if a skull base fracture is suspected (loss of hearing, hemorrhage in the external auditory canal, facial nerve paralysis, etc) it is important or order the proper test for further evaluation, like a temporal bone CT.  A helpful tip is to look for subtle foci of intracranial air and soft tissue swelling which may direct you to a subtle fracture.    

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David Rusinak, MD

Assistant Professor of Radiology, Northwestern Medicine


 How to cite this post

[Peer-Reviewed, Web Publication]  Whipple T,   Gappmeier V (2018, April 23 ). Demystifying the Hand Exam.  [NUEM Blog. Expert Commentary by Rusinak D ]. Retrieved from http://www.nuemblog.com/blog/neuroimaging


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References

1. Shaw AS, Prokop M. Computed Tomography. In Grainger & Allison's Diagnostic Radiology, 6th Edition (2016).

2. McKetty MH. The AAPM/RSNA physics tutorial for residents. X-ray attenuation. RadioGraphics, 1998; 18(1):151-163

3. Cadogan M. CT Head Scan. Life in the Fast Lane. Retrieved from https://lifeinthefastlane.com/investigations/ct-head-scan/.

4. Nadgir R, Yousem DM. Approach and Pitfalls in Neuroimaging. In Neuroradiology: The Requisites, 4th Edition (2017).

5. Mehta A, Jones BP. Neurovascular Diseases. In Grainger & Allison's Diagnostic Radiology, 6th Edition (2016). Chapter 62, 1456-1496.

6. Jones J. Subarachnoid Cisterns. Radiopaedia. Retrieved from https://radiopaedia.org/articles/subarachnoid-cisterns.

7. Nadgir R, Yousem DM. Cranial Anatomy. In Neuroradiology: The Requisites, 4th Edition (2017).

8. Skalski M, Dawes L. Cerebral herniation. Radiopaedia. Retrieved from  https://radiopaedia.org/articles/cerebral-herniation.

9. Baron EM, Jallo JI. TBI: Pathology, Pathophysiology, Acute Care and Surgical Management, Critical Care Principles, and Outcomes. In Brain Injury Medicine: Principles and Practice, 2nd Edition (2012). Chapter 18: 265-282.

10. Nadgir R, Yousem DM. Head Trauma. In Neuroradiology: The Requisites, 4th Edition (2017).

11. Waxman SG. Ventricles and Coverings of the Brain. In Clinical Neuroanatomy, 28th Edition (2013).

12. Nadgir R, Yousem DM. Neurodegenerative Diseases and Hydrocephalus. In Neuroradiology: The Requisites, 4th Edition (2017).

13. Galliard F, Jones J. Intraventricular haemorrhage. Radiopaedia. Retrieved from https://radiopaedia.org/articles/intraventricular-haemorrhage

 

Vertigo: A hint on the HiNTs exam

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Written by: William LaPlant, MD (NUEM PGY-2) Edited by: Mitali Parmar, MD, (NUEM PGY-4) Expert
review by:  Phillip Chang, MD


What is the HiNTs Exam?

The HiNTs Exam is a screening tool for distinguishing a central cause of vertigo from an acute peripheral vestibulopathy (APV), such as benign paroxysmal positional vertigo or vestibular neuritis. The reason for stratifying is obvious (early intervention for central processes, prevention of adverse outcomes), but the degree of difficulty in correctly stratifying a patient is not.  

 

Why is this important?

A normal neurological exam cannot accurately exclude a central process; 10% of patients with a cerebellar infarct, usually in the medial branch of the PICA, will have isolated vertigo without other associated deficit. [1] In the HiNTs exam derivation paper, only 51% of those with a central process causing vertigo had a neurological sign on exam.  [2] While risk factors, including age, can be helpful in risk stratification, there is again no definitive cutoff that can eliminate the risk of a central process.


How to perform the HiNTs exam:

Notably, it can only be used if the patient is currently symptomatic, and is meant for continuous, not intermittent, symptoms.

It is comprised of three components: head impulse, nystagmus and skew

Head Impulse:

How to correctly perform the head impulse test with demonstrations of a negative (A) and positive (B) finding [1].

Ask the patient to relax his/her head and maintain his/her gaze on your nose. Gently move the patient’s head to one side, then rapidly move it back to the neutral position. The patient may have a small corrective saccade. The head impulse test is positive (consistent with peripheral vertigo) if there is a significant lag with corrective saccades. If you can see the correction, it is abnormal. Compare this to the contralateral side; a difference in the speed of correction should be noted. Video for Good Technique

 

The horizontal head impulse test is consistent with peripheral vertigo if it is positive in one direction only. If there is a lag in corrective saccades in both directions, it may be concerning for central vertigo. This test can also be performed in the vertical plane.  A lag in corrective saccades in the vertical plane is always suspicious for a central etiology for vertigo.

 

Pitfalls: The patient must be awake and cooperative. This is essentially an awake “doll’s eye” that requires conscious fixation on an object. Patients who are mentally impaired, unable to fixate, or sedated cannot do this maneuver. Likewise, anxious patients who are unable to relax their neck are unable to do this procedure adequately. False negatives often result from an inexperienced practitioner being too gentle with the head thrust due to fear of causing neck injury.

 

Contraindications: Any patient that has head trauma, neck trauma, an unstable spine, or neck pain concerning for arterial dissection. This maneuver may extend the injury. In addition, one should avoid this in patients with known severe carotid stenosis as it may embolize unstable plaque. An acceptable alternative is assessing for ocular dysmetria.

 

Nystagmus:

Note if it is present in primary gaze (i.e. looking straight ahead) and or in lateral gaze. What direction is the fast component? If the nystagmus is worse looking in one direction, with the fast component present in that same direction on contralateral gaze, it is unidirectional and reassuring for peripheral vertigo. If, for example, a patient has right-beating (fast direction to the right) nystagmus with rightward gaze and leftward gaze, this is unidirectional right-beating nystagmus. The most common peripheral nystagmus, BPPV, in the posterior semicircular canal consists of a unidirectional horizontal nystagmus with a torsional component.

Bidirectional nystagmus, I.E fast component to the right with rightward gaze and to the left with leftward gaze, is concerning for a central process, as is vertical nystagmus or pure torsional nystagmus.


Skew: 

Again have the patient maintain his/her gaze on your nose. Alternate covering each of the patient’s eyes. A positive result will be the deviation of one eye while it is being covered, followed by correction after uncovering it.


Interpretation:                    

If the HiNTs exam is entirely consistent with peripheral vertigo (positive head impulse test, unidirectional and horizontal nystagmus, negative test of skew), then, according to the derivation paper, it is 100% sensitive and 96% specific for a peripheral cause of vertigo. [2]  While this sounds appealing, there are some caveats:

  • ALL findings must be present for the HiNTs exam to be invoked. If, for example, the patient has horizontal rightward nystagmus with right gaze and no skew, but has no findings on impulse test, you cannot invoke the HiNTs exam to clear the patient
  • In the derivation study, it was performed by one practitioner who was a neuro-ophthalmologist using specialized equipment to measure skew.
  • The study has not yet been validated by a large external group, let alone a large external group of emergency medicine providers. We do not know the sensitivity of the test in this population. As such, while useful in stratifying patients and documenting low risk patients, it would be prudent to err on the side of caution with moderate risk patients given the limited evidence of the sensitivity and specificity of the HiNTs exam in the hands of emergency medicine providers.

Should l get imaging, and if so, what?

CT scan has low sensitivity (16%) for acute infarction in the posterior fossa, so unless you are only concerned for bleed (CT non con) or dissection (CTA), evaluating the patient with just a CT brain essentially commits the patient for an MR stroke rule out. [1] Notably, even initial MRI (48 hours from symptom onset) is falsely negative in 12%, so a patient with a concerning story and exam may require repeat imaging. [1]

As such, there are three possible pathways for these patients: no imaging in the lowest risk, CT vs CTA for patients with concern for bleed or dissection, or MRI +/- CT for ischemic stroke rule out.

Bonus Facts

In the HiNTs derivation paper, patients presenting with central vertigo were more likely to have headache or neck pain (38% vs 12%), a neurological sign on exam (51% vs 0%) including truncal instability (the inability to sit upright unassisted [34%]. [2]


Documentation

 Here is an example of one way to document the HiNTs exam. As a default, a negative exam is used. Please feel free to use and adapt it.

Head impulse test: loss of fixation with corrective saccades when head turned to the ***

Nystagmus: unidirectional, horizontal ***-beating nystagmus

Skew deviation: grossly absent


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How to cite this post

[Peer-Reviewed, Web Publication]  LaPlant W, Parmar M  (2018, Jan 15). Vertigo: A hint on the HiNTS exam. [NUEM Blog. Expert Review By Chang P]. Retrieved from http://www.nuemblog.com/blog/hints. 


References

1.        Nelson J a, Viirre E. The clinical differentiation of cerebellar infarction from common vertigo syndromes. West J Emerg Med. 2009;10(4):273-277.

2.        Kattah JC, Talkad A V., Wang DZ, Hsieh YH, Newman-Toker DE. HINTS to diagnose stroke in the acute vestibular syndrome: Three-step bedside oculomotor examination more sensitive than early MRI diffusion-weighted imaging. Stroke. 2009;40(11):3504-3510. doi:10.1161/STROKEAHA.109.551234.

 

The ATACH-2 Trial: Blood Pressure Control in ICH

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Written by: Jessica Bode, MD (NUEM PGY-3) Edited by: Michael Macias, MD,  (NUEM class of 2017) Expert Commentary by: Andrew Naidech, MD, MSPH


Introduction

Hemorrhagic stroke is the second-leading cause of strokes (behind ischemic strokes). The 30-day mortality from intracerebral hemorrhage (ICH) ranges from 35 to 52 percent, with one-half of these deaths occurring within the first two days[1]. A 2010 systematic review estimated that only between 12 and 39 percent of patients go on to achieve independent function[2]. Somewhat intuitively it has long been thought that aggressive blood pressure (BP) control may improve outcomes by limited hemorrhage expansion.

The INTERACT2 study examined the efficacy of intensive systolic blood pressure (SBP) reduction to a goal of <140 mmHg over the course of 1 hour and within a 6 hour window of symptom onset as measured by death and disability. While initially touted as a positive study further examination of the methodology revealed significant differences in the two arms only with ordinal analysis. When comparing this aggressive intervention to the standard treatment SBP goal of <180, the 2013 study found no significant difference between treatment arms. [3]

The 2016 ATACH-2 study sought to reexamine this question: Does aggressively lowering blood pressure lead to decreased death or disability at 90 days?


Study

Qureshi AI et al. Intensive blood-pressure lowering in patients with acute cerebral hemorrhage (ATACH-2 Trial). NEJM 2016. PMID: 2726234


Study Design

  • Randomized, multicenter, two-group, open-label trial (took place in 110 sites in the US, Japan, China, Taiwan, South Korea and Germany)

Population

  • Age 18-90
  • Intracerebral hemorrhage (< 60 cm3) seen on CT scan with NIHSS score 4 or greater
  •  GCS ≥5 
  •  Presenting within 4.5 hours of symptom onset (initially within 3 hours but later extended)
  • At least one reading of SBP of 180 mmHg or more between symptom onset and the initiation of intravenous antihypertensive treatment

Exclusion Criteria

  • Time of symptom onset not reliably established
  • Previously known AVM, neoplasm or aneurysm
  •  Intracerebral hematoma considered to be related to trauma.
  • lCH located in infratentorial regions such as pons or cerebellum
  •  IVH associated with intraparenchymal hemorrhage and blood completely fills one lateral ventricle or more than half of both ventricles
  • Subject is considered a candidate for immediate surgical intervention by the neurosurgery service
  • Pregnancy or parturition within previous 30 days or active lactation
  •  Any history of bleeding diathesis or coagulopathy
  • Use of warfarin within the last 5 day
  • A platelet count less than 50,000/mm3
  • Known sensitivity to nicardipine
  • Pre-morbid mRS of 4 or greater
  • Subject’s living will precludes aggressive ICU management

Ultimately 8532 patients were screened, 1000 were randomized


Intervention Protocol

Patients were assigned to aggressive (SBP goal <140) or standard (SBP goal <180) arms with BP control achieved via nicardipine or, alternatively, via labetalol or diltiazem. Strict control within these parameters was maintained for 24 hours.

Outcome Measures

Primary

  • Modified Rankin scale of 4-6 (death or disability) at 3 months after randomization

Secondary

  • European Quality of Life–5 Dimensions (EQ-5D) scores at 3 months
  • Visual-analogue scale (VAS) at 3 months
  • Proportion of patients with 33% or more expansion in volume of hematoma on 24h delta scan
  • Safety outcomes (fall in GCS by 2 or increase of NIH Stroke Score by 4)
  • Incidence of serious adverse events within 72 hours

Results

“In conclusion, our results do not support the notion that acute reduction to a target systolic blood pressure of 110 to 139 mmHg in patients with intracerebral hemorrhage is more effective in improving functional outcomes than a reduction to a target systolic blood pressure of 140 to 179 mm Hg.”
 
 

Aggressive SBP reduction to a target of 110-139 mmHg did not result in lower rate of death or disability compared to the standard treatment goal of 140-179 mmHg. There was no difference between groups in mRS of 4-6 at 3 months (38.7% in intervention arm, 37.7% in control arm).


Interpretation

 Strengths

  •   Multi-centered trial
  •  Clinically meaningful outcomes

 Weaknesses

  • During the trial, ATACH-2 expanded enrollment from patients who presented within 3 hours to those who presented within 4.5 hours. As the authors acknowledge in the paper, this could mask a time-dependent loss of benefit but they deem this unlikely as subgroup analyses of INTERACT2 data did not demonstrate this phenomenon.
  • Intracerebral hemorrhage grouped as a single entity
  • Primary treatment failure (inability to achieve target BP within 2 hours) was seen in 12.2% of patients in the intensive-treatment group vs just 0.8% in the standard-treatment group. It’s difficult to interpret its impact on treatment effect.
  • 56.2% of patients were Asian making it difficult to generalize to primarily European populations though when subgroups extracted out again no clinically significant benefit to aggressive therapy was found.

The Bottom Line

As mentioned above, ATACH-2 serves as a rebuttal to the purported positive results of the INTERACT2 trial. On further analysis, the interpretation of INTERACT2 results was somewhat flawed and many experts have ultimately come to view it as a negative trial, consistent with ATACH-2. Dr. Rory Spiegel discusses this in more depth here.

As it stands, decisions should be made in conjunction with neurology and neurosurgery at your institution, but the literature at present does not support aggressive BP control and in fact this practice may lead to harm in the form of decreased cerebral perfusion. Standard SBP target of <180 mmHg should probably be maintained.


Expert Commentary

Intracerebral hemorrhage (ICH) is the most deadly form of stroke and has no FDA approved treatment . This is not to say nothing can be done, and the lack of specific therapies has heightened the importance of optimizing the management. Protocols to improve diagnosis, obtain appropriate imaging, obtain subspecialty care, screen for dysphagia, ensure rehabilitation assessments and accredit Stroke Centers are important. Within these broad strokes, hypotheses about which specific management strategies are likely to improve biomarkers and, subsequently, patient outcomes, can be rigorously tested.

Severe hypertension is both a risk factor and a cause of ICH. Hypertension is plausibly linked to growth of the hematoma, a proximate cause of worse patient outcomes. Thus, it is reasonable to test the hypothesis that lowering blood pressure reduces hematoma growth and, subsequently, improves patient outcomes.

INTERACT2 was negative for its primary endpoint of improved odds of good outcome with a dichotomous ordinal scale, while statistically significant for ordinal regression (a method to determine if there is a shift along the score) and health-related quality of life (HRQoL). ATACH-2 found no evidence of overall benefit to rapid blood pressure lowering, and an increased rate of renal failure. There was no evidence that rapid lowering of blood pressure reduced hematoma growth, which makes the potential mechanism of improved outcomes conjectural.

These studies highlight another problem: Outcomes assessment in clinical trials may be too crude to show meaningful differences between groups. Since INTERACT2 and ATACH-2 were designed, NIH has created, normed, and distributed new benchmarks for HRQoL, the Patient Reported Outcomes Measurement Information System (PROMIS) and Neuro-QOL. We have previously validated PROMIS and Neuro-QOL against ordinal scales, and found they highlight facets of HRQoL that are important, but not as well measured by ordinal scales while being more statistically powerful [4].  They are now generally accepted as pivotal outcomes for clinical research [5]. 

Aggressive blood pressure lowering is likely to be of some benefit; a target of 140 – 160 mm Hg systolic is reasonable for patients with systolic blood pressure <220 mm Hg pending the next update of evidence based guidelines. Going forward, accurate assessment of patient outcomes with sensitive, powerful scales will make clinical trials more meaningful, and more likely to be positive.

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Andrew Naidech, MD, MSPH

Professor of Neurology (Stroke and Neurocritical Care), Anesthesiology, Medical School Sciences, Neurological Surgery, and Preventive Medicine (Health and Biomedical Informatics), Northwestern University

 

 



References

  1. Flaherty ML, Haverbusch M, Sekar P, et al. Long-term mortality after intracerebral hemorrhage. Neurology 2006; 66:1182.
  2. van Asch CJ, Luitse MJ, Rinkel GJ, et al. Incidence, case fatality, and functional outcome of intracerebral haemorrhage over time, according to age, sex, and ethnic origin: a systematic review and meta-analysis. Lancet Neurol 2010; 9:167.
  3. Anderson CS, Heeley E, Huang Y, et al. Rapid blood-pressure lowering in patients with acute intracerebral hemorrhage. N Engl J Med 2013; 368:2355.
  4. Naidech AM, Beaumont JL, Berman M, Francis B, Liotta E, Maas MB, Prabhakaran S, Holl J, Cella D.Dichotomous "Good Outcome" Indicates Mobility More Than Cognitive or Social Quality of Life.  Crit Care Med. 2015 Aug;43(8):1654-9. doi: 10.1097/CCM.000000000000108
  5. Salinas J, Sprinkhuizen SM, Ackerson T, Bernhardt J, Davie C, George MG, Gething S, Kelly AG, Lindsay P, Liu L, Martins SC, Morgan L, Norrving B, Ribbers GM, Silver FL, Smith EE, Williams LS, Schwamm LH.An International Standard Set of Patient-Centered Outcome Measures After Stroke.  Stroke. 2016 Jan;47(1):180-6. doi: 10.1161/STROKEAHA.115.010898. Epub 2015 Nov 24.

Posted on October 16, 2017 and filed under Neurology.

Cerebral Venous Sinus Thrombosis: The Forgotten Headache

Cerebral venous sinus thrombosis (CVT) is becoming recognized as a more common and treatable disorder in young patients. Unfortunately, headaches are overwhelmingly common complaints in the emergency department (ED), so CVT can be easy to miss since it has confusing clinical and imaging findings. This week we discuss this clinical entity, when to suspect it and what to order. 

Understanding An Enigma: Lumbar Puncture After A Negative CT in SAH

Acute headache is a common emergency department complaint, and in the right clinical setting, subarachnoid hemorrhage can often be high on the differential.  We review an article that delves into the data on whether patients with a negative head CT still need an LP. The jury may still be out.

The ED Approach To The Comatose Patient

Approximately 3% of all ED patients arrive in some sort of altered mental state. In this post we dive into the emergency department evaluation of these patients and highlights key components of the physical examination and initial evaluation to help you narrow your differential diagnosis. 

Posted on August 29, 2016 and filed under Neurology.