PMID: 9416717Jan 7, 1998Paper

Ketamine decreases intracranial pressure and electroencephalographic activity in traumatic brain injury patients during propofol sedation

Anesthesiology
Jacques AlbanèseC Martin

Abstract

The potential adverse effects of ketamine in neurosurgical anesthesia have been well established and involve increased intracranial pressure (ICP) and cerebral blood flow. However, reexamination of ketamine is warranted because data regarding the effects of ketamine on cerebral hemodynamics are conflicting. Eight patients with traumatic brain injury were studied. In all patients, ICP monitoring was instituted before the study. Control of ICP (less than 25 mmHg), hemodynamic values, and blood gas tension (partial pressure of carbon dioxide in arterial blood between 35-38 mmHg) was obtained with propofol infusion (3 mg x kg(-1) x h(-1)) and mechanical ventilation. The effects of three doses of ketamine, 1.5, 3, and 5 mg/kg, respectively, on ICP, cerebral perfusion pressure, jugular vein bulb oxygen saturation, middle cerebral artery blood flow velocity, and electric activity of the brain (EEG) were measured. The three doses were administered intravenously at 6-h intervals over 30 s through a central venous line. Systemic and cerebral hemodynamics and end-tidal carbon dioxide were continuously monitored and recorded at 1-min intervals throughout the 30-min study periods. Ketamine, in all three doses studied (1.5, 3, and 5 mg/kg) w...Continue Reading

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