Journal «Angiology and Vascular Surgery» • 

1997 • VOLUME 3 • №1

CEREBRAL PERFUSION ASSESSMENT BY TRANSCRANIAL DOPPLER DURING OPEN HEART SURGERY

V.A. Sandrikov, N.G. Ambatiello, Ye.M. Miyerbekov, V.I. Sadovnikov, T.V. Bazyleva
Department of Clinical Physiology, Functional Diagnosis and Ultrasound, Department of Anesthesiology, Scientific Surgery Center, Russian Academy of Medical Sciences,
Moscow, Russia

The capabilities of transcranial Doppler ultra-sonography of the blood flow velocity in the middle cerebral artery have been assessed for studies of cerebral per-fusion in patients undergoing open heart surgery under normo- and hypothermic cardiopulmonary bypass (CPB). Fifteen patients aged 34 to 61 years with a diagnosis of coronary artery disease operated on under hypo-thermic (8 patients) and normothermic (7 patients) CPB were examined. All the patients underwent myocardial revasculariwtion. Cerebral perfusion was assessed by transcranial Doppler ultrasonography of the blood flow velocity in the middle cerebral artery, recorded continuously by the Biomed II (Russia) monitor. No qualitative but only quantitative differences were identified between patterns of the blood flow velocity in the middle cerebral artery. A number of advantages of the transcranial Doppler technique in cerebral perfusion studies of patients undergoing heart surgery under CPB were revealed (sim -plicity of the noninvasive measurement technique and compatibility of the device). The method permits acquisition of the quantitative characteristics of cerebral perfusion, which makes it objective and giving much information. Comparative studies of blood flow velocity measurements in patients undergoing two types of CPB (normothermic and hypothermic) showed the results obtained under normothermic CPB to be more significant. The data obtained provide evidence in favour of the protective effect of moderate hypothermia.

P. 21

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