Clinical trial NCT05032118: Pilot Study of Ketamine Sedation for Aneurysmal Subarachnoid Hemorrhage
Official title: A Pilot Study of Ketamine Sedation Initiated Early After Aneurysmal Subarachnoid Hemorrhage: Effect on Vasospasm, Delayed Cerebral Ischemia, and Functional Outcomes
Study type: INTERVENTIONAL
Overall status: WITHDRAWN
Phase: PHASE2
PHASE3
Conditions: Subarachnoid Hemorrhage, Aneurysmal
Keywords: Ketamine
Vasospasm
Ischemic stroke
Delayed cerebral ischemia
Delayed neurological deficits
Cortical spreading depolarization
Lead sponsor: Oregon Health and Science University
Sponsor class: OTHER
First posted: 2021-09-02
Enrollment: 0
Sex: ALL
Minimum age (years): 18
Maximum age (years): 80
Standard ages: ADULT
OLDER_ADULT
Accepts healthy volunteers: no
Allocation: RANDOMIZED
Intervention model: PARALLEL
Primary purpose: PREVENTION

Brief summary: 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.

Detailed description: 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.

Eligibility criteria: 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)

Primary outcomes:
measure: Incidence of moderate and severe radiographic cerebral vasospasm (CV)
timeFrame: Days 4-12 post-bleed
Secondary outcomes:
measure: Lindegaard ratio (LR)
timeFrame: Days 4-12 post-bleed
measure: Incidence of delayed cerebral ischemia (DCI)
timeFrame: Days 4-12 post-bleed
measure: Incidence of CV/DCI-related Infarction
timeFrame: Days 4-14 post-bleed
measure: Functional outcomes
timeFrame: Hospital discharge (on average days 14-21 post-bleed), and 3 and 6 months post-bleed
Other outcomes:
measure: Vasopressor requirements
timeFrame: Within 12 days post-bleed
measure: Incidence of acute kidney injury
timeFrame: Within 12 days post-bleed
measure: Incidence of moderate to severe drug-induced liver injury
timeFrame: Within 14 days post-bleed
measure: Physiologic parameters: heart rate
timeFrame: Days 3-10 post-bleed
measure: Physiologic parameters: blood pressure
timeFrame: Days 3-10 post-bleed
measure: Physiologic parameters: intracranial pressure
timeFrame: Days 3-10 post-bleed
measure: Physiologic parameters: cerebral perfusion pressure
timeFrame: Days 3-10 post-bleed
Locations:
Study officials:
affiliation: Oregon Health and Science University
name: Jenna L Leclerc, MD, PhD
role: PRINCIPAL_INVESTIGATOR
References:
citation: Carlson AP, Abbas M, Alunday RL, Qeadan F, Shuttleworth CW. Spreading depolarization in acute brain injury inhibited by ketamine: a prospective, randomized, multiple crossover trial. J Neurosurg. 2018 May 25;130(5):1513-1519. doi: 10.3171/2017.12.JNS171665. Print 2019 May 1.
citation: Sakowitz OW, Kiening KL, Krajewski KL, Sarrafzadeh AS, Fabricius M, Strong AJ, Unterberg AW, Dreier JP. Preliminary evidence that ketamine inhibits spreading depolarizations in acute human brain injury. Stroke. 2009 Aug;40(8):e519-22. doi: 10.1161/STROKEAHA.109.549303. Epub 2009 Jun 11.
citation: Groetzinger LM, Rivosecchi RM, Bain W, Bahr M, Chin K, McVerry BJ, Barbash I. Ketamine Infusion for Adjunct Sedation in Mechanically Ventilated Adults. Pharmacotherapy. 2018 Feb;38(2):181-188. doi: 10.1002/phar.2065. Epub 2018 Jan 10.
citation: Schiefecker AJ, Beer R, Pfausler B, Lackner P, Broessner G, Unterberger I, Sohm F, Mulino M, Thome C, Humpel C, Schmutzhard E, Helbok R. Clusters of cortical spreading depolarizations in a patient with intracerebral hemorrhage: a multimodal neuromonitoring study. Neurocrit Care. 2015 Apr;22(2):293-8. doi: 10.1007/s12028-014-0050-4.
citation: Hertle DN, Dreier JP, Woitzik J, Hartings JA, Bullock R, Okonkwo DO, Shutter LA, Vidgeon S, Strong AJ, Kowoll C, Dohmen C, Diedler J, Veltkamp R, Bruckner T, Unterberg AW, Sakowitz OW; Cooperative Study of Brain Injury Depolarizations (COSBID). Effect of analgesics and sedatives on the occurrence of spreading depolarizations accompanying acute brain injury. Brain. 2012 Aug;135(Pt 8):2390-8. doi: 10.1093/brain/aws152. Epub 2012 Jun 19.
citation: Santos E, Olivares-Rivera A, Major S, Sanchez-Porras R, Uhlmann L, Kunzmann K, Zerelles R, Kentar M, Kola V, Aguilera AH, Herrera MG, Lemale CL, Woitzik J, Hartings JA, Sakowitz OW, Unterberg AW, Dreier JP. Lasting s-ketamine block of spreading depolarizations in subarachnoid hemorrhage: a retrospective cohort study. Crit Care. 2019 Dec 30;23(1):427. doi: 10.1186/s13054-019-2711-3.
citation: Wanchoo S, Khazanehdari S, Patel A, Lin A, Rebeiz T, DeMatteo C, Ullman J, Ledoux D. Ketamine for empiric treatment of cortical spreading depolarization after subdural hematoma evacuation. Clin Neurol Neurosurg. 2021 Jan;200:106318. doi: 10.1016/j.clineuro.2020.106318. Epub 2020 Oct 17.
citation: Von der Brelie C, Seifert M, Rot S, Tittel A, Sanft C, Meier U, Lemcke J. Sedation of Patients with Acute Aneurysmal Subarachnoid Hemorrhage with Ketamine Is Safe and Might Influence the Occurrence of Cerebral Infarctions Associated with Delayed Cerebral Ischemia. World Neurosurg. 2017 Jan;97:374-382. doi: 10.1016/j.wneu.2016.09.121. Epub 2016 Oct 11.