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Anesth Analg 1987; 66:825-832
© 1987 International Anesthesia Research Society
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Cerebral Autoregulation and Flow/Metabolism Coupling during Cardiopulmonary Bypass

The Influence of Paco2

John M. Murkin, MD, FRCP, J. Keith Farrar, PhD, W. Arnold Tweed, MD, FRCP, F. Neil McKenzie, MB, CHB, FRCS(C), and Gerard Guiraudon, MD, FRCS(C)

Received from the Departments of Anaesthesia, Clinical and Neurological Sciences, and Cardiovascular and Thoracic Surgery, University Hospital, University of Western Ontario, London, Ontario, Canada.

Abstract

Measurement of 133Xe clearance and effluent cerebral venous blood sampling were used in 38 patients to determine the effects of cardiopulmonary bypass, and of maintaining temperature corrected or noncorrected PaCO2 at 40 mm Hg on regulation of cerebral blood flow (CBF) and flow/metabolism coupling. After induction of anesthesia with diazepam and fentanyl, mean CBF was 25 ml·100 g–1·min–1 and cerebral oxygen consumption, 1.67 ml·100 g–1·min–1. Cerebral oxygen consumption during nonpulsatile cardiopulmonary bypass at 26°C was reduced to 0.42 ml·100 g–1·min–1 in both groups. CBF was reduced to 14–15 ml·100 g–1·min–1 in the non-temperature-corrected group (n = 21), was independent of cerebral perfusion pressure over the range of 20–100 mm Hg, but correlated with cerebral oxygen consumption. In the temperature-corrected group (n = 17), CBF varied from 22 to 32 ml·100 g–1·min–1, and flow I metabolism coupling was not maintained (i.e., CBF and cerebral oxygen consumption varied independently). However, variation in CBF correlated significantly with cerebral perfusion pressure over the pressure range of 15–95 mm Hg. This study demonstrates a profound reduction in cerebral oxygen consumption during hypothermie non-pulsatile cardiopulmonary bypass. When a non-temperature-corrected PaCO2 of approximately 40 mm Hg was maintained, CBF was lower, and analysis of pooled data suggested that CBF regulation was better preserved, i.e., CBF was independent of pressure changes and dependent upon cerebral oxygen consumption.

Key Words: ANESTHESIA—cardiovascular. • BRAIN—blood flow, metabolism. • SURGERY—cardiac.




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