Parameters of Cerebral Perfusion
Parameters of Cerebral Perfusion
The purpose of this study is to determine whether cerebral blood flow and cerebral tissue
 oxygenation is most dependent on cardiac output or on mean arterial pressure in patients
 undergoing cardiac surgery with the use of cardiopulmonary bypass.
Inclusion Criteria:

 -  Undergoing cardiopulmonary bypass for CABG a

 -  having an appropriate temporal bone window for reliable TCD monitoring

 -  needing pharmacological intervention because of hypotension before going on CPB.

 Exclusion Criteria:

 -  requiring hypothermia during surgery

 -  requiring emergency surgery

 -  contraindication for phenylephrine,

 -  having known brain pathology (e.g. Cerebral Vascular Accident (CVA) or increased
 intracranial pressure

 -  having a history of severe carotid artery stenosis.