[Transcranial Doppler sonography during pulsatile and non-pulsatile extracorporeal circulation].

Transcranial Doppler sonography (TCD) was used to determine the mean blood flow velocity of the middle cerebral artery (Vm-MCA) and pusatility (systolic/diastolic flow velocity=S/D) in 25 patients undergoing aortocoronary bypass grafting before, during, and after extracorporeal circulation (ECC)