Vasomotor Waves during Cardiopulmonary Bypass

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Abstract
Vasomotor waves (VMW) were observed in 9 cardiac patients during cardiopulmonary bypass. The period and amplitude of the waves were described together with their consistency and other pertinent data. Effects of several pharmacologic agents [morphine, ketamine, diazepam, droperidol and fentanyl] on these waves were tested. These VMW are likely to be caused by spontaneous oscillation of presso-regulatory feedback systems. Cerebral ischemic response is suspected to be the most likely candidate. No patients showed any gross neurological symptoms in the postoperative period.

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