NCT05095857

The Anaesthetic Ketamine as Treatment for Patients With Severe Acute Brain Injury

S-ketamine for Cortical Spreading Depolarisation in Patients With Severe Acute Brain Injury

• Status: Recruiting
• Phase: Phase 4
• Study type: Interventional
• Enrollment: 400 (estimated)
• Sponsor: Rigshospitalet, Denmark · Academic / Other
• Sex: All
• Age: 18 Years
• Healthy volunteers: Not accepted

Summary

Cortical spreading depolarisations are pathological depolarisation waves that occur frequently after severe acute brain injury and has been associated with poor outcome. S-ketamine has been shown to inhibit cortical spreading depolarisations. The aim of the present study is to examine the efficacy and safety of using S-ketamine for treatment of patients with severe acute brain injury, as well as the feasibility of the trial design.

Detailed description

Severe acute brain injury caused by traumatic brain injury (TBI), aneurysmal subarachnoid haemorrhage (aSAH) or intracerebral haemorrhage (ICH) carries a high morbidity and mortality. In all these conditions, clinical neurological deterioration may occur as a consequence of so-called secondary brain injury, which reduces the chance of a good outcome. Thus, neurological deterioration after the initial injury is generally associated with a worse outcome. Cortical spreading depolarisations (SDs) are pathological depolarisation waves that occur frequently after both TBI, SAH, and ICH and have been related to poor outcome. The SDs, which can be detected by electrocorticography (ECoG, using electrodes placed directly on the brain cortex), propagate across the cerebral cortex and are followed by an excessive upregulation of cerebral metabolism and decrease in cerebral blood flow. In vulnerable brain tissue such as in patients after acute primary brain injury, this combination of hypermetabolism and hypoperfusion is thought to increase the risk of ischaemia and infarction. The anaesthetic drug ketamine, which is an NMDA-receptor antagonist, appears to inhibit SDs both in vitro and in patient series. The present trial is a randomised, blinded, placebo-controlled, parallel-group pilot and feasibility trial, where participants with clustered SD despite physiological optimisation are allocated 1:1 to infusion of S-ketamine versus matching placebo. In the present trial, participants admitted to the neurointensive care unit with TBI, aSAH or ICH and undergoing craniotomy or craniectomy (for clipping of an aneurysm or removal of a space-occupying haematoma). Patients are monitored at the neurointensive care unit, Rigshospitalet and sedated using standard sedatives. Patients will be monitored both with ECoG, intracranial pressure (ICP), brain tissue oxygen tension (PbtO2), and microdialysis. Patients in whom SDs occur will be subjected to a protocol of physiological optimisation targeting ICP, PbtO2, blood glucose and core temperature following clinical guidelines. If clustered SDs occur despite optimisation, patients are randomly allocated to infusion of either S-ketamine or matching placebo (isotonic saline) at a 1:1 allocation ratio with full blinding of the treatment allocation. The present trial will continue until 160 participants have been randomised. Since only participants with clustered SDs are randomised, the investigators expect to include no more than 400 participants for ECoG monitoring. The present trial aims to examine the efficacy of S-ketamine on SDs, the safety, and the feasibility of the trial design. Furthermore, surviving patients will be followed up until six months after the injury, and functional outcome will be recorded by the modified Rankin Scale (mRS).

Conditions

• Subarachnoid Hemorrhage, Aneurysmal
• Intracerebral Hemorrhage
• Traumatic Brain Injury

Interventions

Type	Name	Description
DRUG	S-ketamine	S-ketamines is an NMDA-receptor antagonist with sedative and analgesic properties. It will in the present trial be given in sedative doses (2-3 mg/kg/hour) in case of clustered SDs following a dosing algorithm according to SD occurrence.
OTHER	Isotonic saline (placebo)	Isotonic saline has the same appearance as S-ketamine with both being clear liquids with no bubbles or other distinguishing features.

Timeline

• Start date: 2023-09-15
• Primary completion: 2028-09-15
• Completion: 2028-09-15
• First posted: 2021-10-27
• Last updated: 2024-06-26

Locations

1 site across 1 country: Denmark