Pilot Study of Ketamine Sedation for Aneurysmal Subarachnoid Hemorrhage

Study Results

Results pending

The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.

Basic Information

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Recruitment Status

WITHDRAWN

Clinical Phase

PHASE2/PHASE3

Study Classification

INTERVENTIONAL

Study Start Date

2023-04-27

Study Completion Date

2023-04-27

Brief Summary

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Aneurysmal subarachnoid hemorrhage (aSAH) is bleeding into the space between the brain and the tissues that surround the brain as a result of a ruptured aneurysm and is a type of stroke associated with high morbidity and mortality. Those that survive the initial bleed are critically ill and require prolonged intensive care unit stays since they are at risk for a multitude of secondary insults that can further worsen functional outcomes. An especially feared secondary insult is delayed cerebral ischemia (DCI), which is a lack of blood flow to a particular portion of the brain that can result in an ischemic stroke and produce profound neurologic deficits. How DCI develops in some people after aSAH and not others is unknown, but many have hypothesized various mechanisms such as 1) cerebral vasospasm, a focal anatomic narrowing of the blood vessels in the brain that could decrease downstream blood flow, 2) abnormal electrical activity, and 3) microthrombi, or the formation of small blood clots.

It is vitally important to identify a therapy that could protect the brain from these secondary insults that happen days after the initial brain bleed. Ketamine is a drug used in the majority of hospitals around the world for various indications, including general anesthesia, sedation, and for pain. Ketamine blocks a specific receptor that is present within the brain and in doing so could play a critical protective role against these secondary insults after aSAH by blocking the flow of dangerous chemicals. Ketamine may provide the following beneficial properties after aSAH: 1) pain control, 2) seizure prevention, 3) blood pressure support, 4) dilation of the brain blood vessels, 5) sedation, 6) anti-depressant, and 7) anti-inflammatory. This project is designed to test whether ketamine sedation in the intensive care unit after aneurysm repair provides better outcomes than the currently used sedation regimen.

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Detailed Description

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Aneurysmal subarachnoid hemorrhage (aSAH) is a devastating form of hemorrhagic stroke associated with high morbidity and mortality, which has been linked to the development of cerebral vasospasm (CV) and delayed cerebral ischemia (DCI). Two prominent mechanisms by which CV and DCI have been proposed to occur include cortical spreading depolarizations (CSDs) and neuroinflammation. Ketamine is a NMDA receptor antagonist that is in widespread and common clinical use as a general anesthetic, sedative, analgesic and anti-depressant, among other indications. The investigators hypothesize that early initiation of ketamine sedation following aneurysm securement in lieu of the usual propofol-based sedation regimen will improve aSAH outcomes via a multifactorial mechanism. Many potential mechanisms exist by which ketamine could be beneficial following aSAH, including but not limited to: 1) direct cerebrovasodilation, 2) inhibiting the development of and terminating ongoing CSDs, 3) reducing neuronal hyperexcitability and glutamate-mediated excitotoxicity, 4) positively modulating a plethora of neuroinflammatory cascades, and 5) reduced vasopressor requirements owing to intrinsic sympathomimetic properties. This study is a prospective randomized single-blind pilot and feasibility study to begin investigating whether early ketamine administration after aSAH attenuates CV, DCI, DCI-associated infarctions, and improves functional outcomes.

Conditions

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Subarachnoid Hemorrhage, Aneurysmal

Study Design

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Allocation Method

RANDOMIZED

Intervention Model

PARALLEL

Primary Study Purpose

PREVENTION

Blinding Strategy

SINGLE

Participants

Study Groups

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Ketamine

Intravenous ketamine will be initiated following aneurysm securement at 0.5mg/kg/h and will be titratable by 0.2mg/kg/h every 20min to a Richmond Agitation Sedation Scale (RASS) goal of 0 to -1 (or as otherwise clinically indicated). Ketamine boluses will be available at 0.5mg/kg every 1hr as needed for inadequate sedation or breakthrough agitation. An additional 0.5mg/kg bolus may be utilized prior to initiating the ketamine infusion, or as needed at the discretion of the clinician. The maximum ketamine infusion dose will be limited to 4mg/kg/h. A fixed-dose propofol infusion at 10mcg/kg/min will simultaneously be administered to minimize the potential psychomimetic side effects of ketamine. This sedation paradigm will continue for up to 10 days post-bleed or until the study participant no longer requires sedation, whichever occurs earlier. If the RASS goal is not met with this sedation regimen, additional agents will be at the discretion of the intensivist.

Group Type EXPERIMENTAL

Ketamine Hydrochloride

Intervention Type DRUG

Titratable ketamine infusion + low fixed-dose propofol.

Standard of Care

Intravenous titratable propofol will be initiated as needed per current standard of care, which generally consists of initiating the infusion at 10-20mcg/kg/min with titration parameters of 5-10mcg/kg/min every 5-10min for a RASS goal of 0 to -1 (or as otherwise clinically indicated). Propofol boluses are available at 10-20mg (or higher dosages if clinically required) every 15min as needed for inadequate sedation or breakthrough agitation. The maximum infusion dose is generally limited to 50mcg/kg/min. If the RASS goal is not met with this sedation regimen, additional agents will be at the discretion of the intensivist.

Group Type ACTIVE_COMPARATOR

Propofol

Intervention Type DRUG

Standard of care titratable propofol infusion.

Interventions

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Ketamine Hydrochloride

Titratable ketamine infusion + low fixed-dose propofol.

Intervention Type DRUG

Propofol

Standard of care titratable propofol infusion.

Intervention Type DRUG

Other Intervention Names

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Ketalar Diprivan

Eligibility Criteria

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Inclusion Criteria

1. Male or female 18 to 80 years old
2. Diagnosis of ruptured saccular aneurysm confirmed by cerebral angiography or computed tomography angiography (CTA)
3. Aneurysm securement via open neurosurgical clipping or endovascular coiling
4. Modified fisher grade 3 or 4 on admission cranial computed tomography scan
5. External ventricular drain placed as part of routine care
6. Mechanical ventilation requiring sedation
7. Ability to enroll within 72h following bleed
8. Informed consent

Exclusion Criteria

1. Subarachnoid hemorrhage due to causes other than a saccular aneurysm (e.g. non-aneurysmal, traumatic, rupture of a fusiform or mycotic aneurysm)
2. Pregnancy or currently breast-feeding an infant
3. Forensic patient
4. Known significant baseline neurologic deficit
5. Glasgow coma scale 3 with fixed and dilated pupils or other signs of imminent death
6. Increased intracranial pressure \>30mmHg in sedated patients lasting \>4 hours anytime since the initial bleed
7. Presence of systemic or CNS infection
8. Cardiopulmonary resuscitation after the initial bleed
9. Angiographic vasospasm prior to aneurysm repair, as documented by cerebral angiography or CTA
10. Surgical complication including but not limited to massive intraoperative hemorrhage, vascular occlusion, or inability to secure the ruptured aneurysm
11. Severe coronary artery disease (e.g. obstructive disease with stenosis \>50% of any vessel on coronary angiography), angina, symptoms or evidence of myocardial ischemia, myocardial infarction within 3 months of study enrollment
12. Heart failure or cardiomyopathy with ejection fracture \<35%, symptoms or evidence of decompensated heart failure on admission or within preceding 6 months
13. Tachyarrhythmia (e.g. history or evidence of any symptomatic ventricular tachycardia, ventricular fibrillation, atrial fibrillation or flutter with rapid ventricular rate, or any supraventricular tachycardia)
14. Active psychotic symptoms, history of primary psychotic disorder (e.g. schizophrenia or schizoaffective disorder), or mania
15. History of ketamine dependence or abuse
16. Hypersensitivity to ketamine or any component of the formulation
17. Increased intraocular pressure or history of glaucoma
18. Known or suspected cirrhosis or evidence of moderate-severe liver dysfunction on laboratory evaluation (e.g. ALT and AST\>3x upper limit of normal, alkaline phosphatase and gamma-glutamyl transferase\>2.5x upper limit of normal, and/or bilirubin\>1.5x upper limit of normal)
19. Severe kidney disease (e.g. plasma creatinine ≥2.5 mg/dL)

Minimum Eligible Age

18 Years

Maximum Eligible Age

80 Years

Eligible Sex

ALL

Accepts Healthy Volunteers

No