Effect of the knee-chest position on cerebral blood flow in patients undergoing lumbar spinal surgery.
The cerebral haemodynamic effect of the knee-chest position was evaluated in 15 anaesthetised patients undergoing elective lumbar disc surgery and divided into a control group (n = 8) where cerebral blood flow (CBF) was measured twice in the supine position and an experimental group (n = 7) where the first CBF was measured in the supine position and the second in the knee-chest position. CBF was measured by a modified intravenous 133xenon washout technique. Mean global CBF did not change in control group (56.1, SD 9.2 versus 52.8, SD 10.8 units) and was not significantly modified by the knee-chest posture, 51.8, SD 8.8 units versus 53.9, SD 7.4 units in the supine position. The results indicate that mean global CBF in the knee-chest position is not different from CBF in the supine position in healthy patients.
Pittet
J F
JF
Department of Anaesthesiology, University Hospital of Geneva, Switzerland.
Ramadan
A
A
Morel
D R
DR
Forster
A
A
D000328:Adult; D002245:Carbon Dioxide / Q000097:blood; D002560:Cerebrovascular Circulation / Q000502:physiology; D006801:Humans; D007405:Intervertebral Disc Displacement / Q000601:surgery*; D008159:Lumbar Vertebrae / Q000601:surgery*; D008176:Lung Volume Measurements; D008875:Middle Aged; D010100:Oxygen / Q000097:blood; D011187:Posture; D016032:Randomized Controlled Trials as Topic
D002245:Carbon Dioxide; D010100:Oxygen