[Hemodynamic Management of a Patient at Risk for Stroke Using Regional Cerebral Oxygen Saturation Monitoring and an...

An 88-year-old man, 155 cm in height and 45 kg in weight, was scheduled for total stomach extirpation. Partial cerebral infarction and cerebral arterial stenosis were diagnosed 20 days before the operation. The patient's mean arterial pressure was 80 mmHg. Regional brain 0₂ saturation (rSO₂) obtained via non- invasive monitoring using the INVOS™ system was above 65% on both sides, and these were used as con- trol values before anesthesia induction. Anesthesia was induced with propofol 50 mg and rocuronium 40 mg intravenously after thoracic epidural catheter placement. Throughout the operation, mean blood pressure was over 70% of the control value. Stroke volume variation (SVV) was tracked during the operation by arterial pressure-based continuous cardiac output monitoring (FloTrac™); SVV values under 13 were maintained using vasopressors and fluid loading. The rS0₂ levels were consistently above control values on both sides. The operation was completed as a gas- tric-bypass surgery and the patient was discharged from the hospital without complications. Using the INVOS™ and FloTraTM systems to maintain mean pressure over 70% of the control value may have prevented a new cerebral ischemic event This potentially useful application of the INVOS™ and FloTrac™ systems should be validated in future stud- ies.