Abstract WP134: Decreased Flow Velocities After General Anesthesia Before Carotid Endarterctomy Are Not Associated with Cerebral Hyperperfusion Syndrome or Perioperative Cerebral Infarction

Introduction: Cerebral Hyperperfusion Syndrome (CHS) is a life threatening complication in about 3% of patients following carotid endarterectomy (CEA). There is a concern that baseline flow velocities typically decrease after general anesthesia (GA) may predispose patients to CHS and other perioperative adverse events. Hypothesis: Patients with decreased flow velocity after GA are at increased risk for CHS using ultrasonographic and clinical diagnostic criteria. Methods: We retrospectively evaluated 920 patients who received CEA from 2006 to 2016 at a major hospital in China. Middle cerebral artery blood flow velocities were measured when patients were awake and after induction of the GA. Ultrasonographic diagnostic criterion of CHS was “100% increase in flow velocity by TCD from the baseline to post-CEA”. Patients were classified into two groups: NORMAL group if flow velocity decreased =30%. The occurrences of CHS by ultrasonongraphic and clinical criteria, perioperative ...