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Cerebral vascular reactivity response to anaesthetic induction with propofol in patients with intracranial space-occupying lesions and vascular malformations

Published online by Cambridge University Press:  11 July 2005

K. Schmieder ,
W. Schregel ,
M. Engelhardt ,
A. Harders  and
G. Cunitz
K. Schmieder
Affiliation:
Ruhr-University Bochum, Department of Neurosurgery, Bochum, Germany
W. Schregel
Affiliation:
Ruhr-University Bochum, Department of Anaesthesiology, Bochum, Germany
M. Engelhardt
Affiliation:
Ruhr-University Bochum, Department of Neurosurgery, Bochum, Germany
A. Harders
Affiliation:
Ruhr-University Bochum, Department of Neurosurgery, Bochum, Germany
G. Cunitz
Affiliation:
St-Josef Hospital, Department of Anaesthesiology, Krefeld, Germany
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Extract

Summary

Background and objective: In clinical trials, autoregulation and carbon dioxide reactivity are preserved during propofol anaesthesia. Paradoxical increases of blood flow velocity during induction of anaesthesia could be demonstrated in patients with brain tumours. This study evaluates the effects of propofol on cerebral blood flow velocity in patients undergoing surgery for brain tumours and vascular malformations.

Methods: Changes in cerebral blood flow velocity after the administration of propofol were assessed using bilateral 2 MHz transcranial Doppler probes in 47 patients undergoing surgery for brain tumours and in 22 patients undergoing surgery for aneurysms and angiomas.

Results: Flow reduction after propofol was slightly less pronounced on the side of the tumour; in patients with cerebrovascular lesions, no difference between the two sides was detectable. After the administration of propofol a flow increase was present on the side of the tumour in 2 patients. In 3 patients with angiomas, the flow decrease after the administration of propofol was less pronounced on the side of the angioma. Neither observation gave statistical proof of abnormality.

Conclusions: The flow changes after propofol may give a hint of cerebrovascular reactivity. Further investigations should focus on combined measurements of cerebral autoregulation and carbon dioxide reactivity and should focus on patients with impaired consciousness to test for reliability.

Keywords

ANAESTHETICS, intravenous, propofolMONITORING, Doppler sonographySURGERY, neurological
Type
Original Article
Information
European Journal of Anaesthesiology , Volume 20 , Issue 6 , June 2003 , pp. 457 - 460
Copyright
© 2003 European Society of Anaesthesiology

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