[Transcranial Doppler sonography and hemodynamics].
13 patients without cerebral or cerebrovascular diseases were investigated by transcranial Doppler sonography during Swan-Ganz catheterisation for cardiologic purposes. Massive increases of mean arterial pressure, heart rate and cardiac index were observed during exercise; flow velocities in the middle cerebral artery increased only to the same extent as the endexpiratory carbon dioxide rose. However, the pulsatility index increased significantly (p less than 0.01) although a decrease should have been expected due to carbon dioxide accumulation. These results are indicative of a functioning autoregulation independent of carbon dioxide; they are relevant for interpretation of TCD results in patients with disturbed autoregulation.
Schregel
W
W
Abteilung für Anästhesie und operative Intensivtherapie, Knappschafts-Krankenhaus Bochum-Langendreer, Ruhr-Universität Bochum.
Sihle-Wissel
M
M
Machraoui
A
A
Reier
W
W
D000328:Adult; D001783:Blood Flow Velocity; D002545:Brain Ischemia / Q000175:diagnosis*; D002245:Carbon Dioxide / Q000097:blood; D006328:Cardiac Catheterization; D002560:Cerebrovascular Circulation; D003327:Coronary Disease / Q000150:complications; D004453:Echoencephalography / Q000379:methods*; D005260:Female; D006439:Hemodynamics; D006706:Homeostasis; D006801:Humans; D008297:Male; D008875:Middle Aged; D009203:Myocardial Infarction / Q000150:complications
D002245:Carbon Dioxide
Transkranielle Dopplersonographie und Hämodynamik.