Pilot Study of Ketamine Sedation for Aneurysmal Subarachnoid Hemorrhage

• Status: Not yet recruiting
• Trial end date: 2023-07-01
• Target enrollment: 0
• Participant gender: All

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.

• Phase: Phase 2/Phase 3
• Accepts Healthy Volunteers?: No

Details

• Lead Sponsor: Jenna L Leclerc MD, PhD
• Treatments: Ketamine; Propofol

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)