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

Официальное название

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

Обзор

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.

Подробное описание

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).

Вмешательства

• Препарат 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.
• Другое Isotonic saline (placebo)
  Isotonic saline has the same appearance as S-ketamine with both being clear liquids with no bubbles or other distinguishing features.

Первичные конечные точки

• Occurrence of SDs after randomisation [Срок оценки: From randomisation to end of ECoG monitoring, expected to be a maximum of 14 days]

Вторичные конечные точки (2)

• Rate of adverse events and adverse reactions [Срок оценки: During treatment with S-ketamine or placebo, a maximum of 14 days]
• Functional outcome at 6 months after randomisation [Срок оценки: 6 months after randomisation]

Критерии участия

Критерии включения

• Age ≥ 18 years.
• Admitted to the NICU with a diagnosis of traumatic brain injury (TBI), aneurysmal subarachnoid haemorrhage (aSAH) or spontaneous intracerebral haemorrhage (ICH).
• Planned for surgery with a supratentorial craniotomy or craniectomy.
• Expected to continue sedation and mechanical ventilation after surgery.

Критерии исключения

• Neither patient or next of kin understand Danish or English.
• Known allergy to S-ketamine (the active pharmaceutical ingredient or the excipients).
• Wake-up call to occur immediately after surgery.
• Pregnancy (all female participants aged ≤ 50 years will have a urine or blood hCG taken to control for pregnancy).
• Active anti-psychotic treatment before admission.
• Current abuse of ketamine.
• Decision to withdraw active treatment.
• ICH secondary to a known brain tumour at the time of inclusion.

Since this is an emergency trial informed consent will be obtained from a trial guardian before inclusion of the participant, and informed consent will be sought from next of kin as soon as possible.

Критерии приведены из реестра в оригинале (на английском). Окончательную оценку соответствия проводит исследовательский центр.

Здоровые добровольцы: Нет

Дизайн исследования

Распределение

Рандомизированное

Модель

Параллельные группы

Маскирование

Четверное слепое

Основная цель

Лечение

Центры проведения

Дания · 1 центр

• Rigshospitalet — Copenhagen

Публикации

• Macdonald RL, Schweizer TA. Spontaneous subarachnoid haemorrhage. Lancet. 2017 Feb 11;389(10069):655-666. doi: 10.1016/S0140-6736(16)30668-7. Epub 2016 Sep 13. PMID 27637674
• Nieuwkamp DJ, Setz LE, Algra A, Linn FH, de Rooij NK, Rinkel GJ. Changes in case fatality of aneurysmal subarachnoid haemorrhage over time, according to age, sex, and region: a meta-analysis. Lancet Neurol. 2009 Jul;8(7):635-42. doi: 10.1016/S1474-4422(09)70126-7. Epub 2009 Jun 6. PMID 19501022
• Zhou YT, Tong DM, Wang SD, Ye S, Xu BW, Yang CX. Acute spontaneous intracerebral hemorrhage and traumatic brain injury are the most common causes of critical illness in the ICU and have high early mortality. BMC Neurol. 2018 Aug 27;18(1):127. doi: 10.1186/s12883-018-1127-z. PMID 30149796
• Gross BA, Jankowitz BT, Friedlander RM. Cerebral Intraparenchymal Hemorrhage: A Review. JAMA. 2019 Apr 2;321(13):1295-1303. doi: 10.1001/jama.2019.2413. PMID 30938800
• Gruenbaum SE, Zlotnik A, Gruenbaum BF, Hersey D, Bilotta F. Pharmacologic Neuroprotection for Functional Outcomes After Traumatic Brain Injury: A Systematic Review of the Clinical Literature. CNS Drugs. 2016 Sep;30(9):791-806. doi: 10.1007/s40263-016-0355-2. PMID 27339615
• Gruenbaum SE, Bilotta F. Postoperative ICU management of patients after subarachnoid hemorrhage. Curr Opin Anaesthesiol. 2014 Oct;27(5):489-93. doi: 10.1097/ACO.0000000000000111. PMID 25115766
• Seder DB, Mayer SA. Critical care management of subarachnoid hemorrhage and ischemic stroke. Clin Chest Med. 2009 Mar;30(1):103-22, viii-ix. doi: 10.1016/j.ccm.2008.11.004. PMID 19186283
• Sheriff FG, Hinson HE. Pathophysiology and clinical management of moderate and severe traumatic brain injury in the ICU. Semin Neurol. 2015 Feb;35(1):42-9. doi: 10.1055/s-0035-1544238. Epub 2015 Feb 25. PMID 25714866

Идентификаторы

NCT: NCT05095857 · H-21056972 · 2021-003716-12

Первоисточники (государственные реестры)

• ClinicalTrials.gov (NIH, США)

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