Cerebral haemodynamics during proximal aortic cross-clamping

EurJ VascSurg5, 27-31 (1991)

Cerebral Haemodynamics During Proximal Aortic Cross-clamping* Petter Aadahl, 1 0 l a D. S~ether, 2 Roar Stenseth, 1 Roar Juul a and Hans O. Myhre 2

Departments of 1Anaesthesiology,

2Surgeryand 3Neurosurgery,

Trondheim University Clinic, N-7006 Trondheim, Norway

This study was carried out to examine cerebral bloodflozo, including the microcirculation and intracranial pressure during crossclamping (XC) of Ne Noracic aorta in pigs. Bloodflow in the internal carotid artery was measured by electromagneticflowmetry. Cerebral microcirculation was studied by the laser Doppler technique, and intracran&l pressure measured by applying a fibre optic pressure monitoring catheter in the same craniotomy. Maximal and mean bloodflow velocity of the middle cerebral artery was recorded using a transcranial Doppler and cardiac output measured bj! thermodilution. The thoracicaorta was cross-clamped distal to the left subclavian artery for 30 min. During aortic XC the internal carotid artery bloodflozo increased 191% (p