system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
Which of the following intravenous anaesthetic causes increase in cerebral O2 tension.
assistant
The correct answer is  Ketamine increases cerebral oxygen consumption, cerebral blood flow and intracranial pressure - thus avoided in head injury patient Ketamine administration may be associated with lacrimation and salivation which can be attenuated by premedication with an anticholinergic agent such as glycopyrrolate. Etomidate, propofol, and thiopentone decrease CMRO2, CBF, and ICP.