The correlation of cerebral tissue oxygenation index and mean blood pressure in moyamoya patients

Moyamoya patients underwent cerebral revascularization surgery had higher risk for postoperative complications. Cerebral autoregulation impaired may be the main mechanism for postoperative complications. In our study, we used correlation coefficient r between cerebral tissue oxygenation index (TOI) and mean arterial blood pressure (MAP) to assessing of cerebral autoregulation. Total 30 moyamoya patients measured MAP and TOI. Spearman rank correlation coefficient r was calculated between MAP and TOI. 8 (26.67%) patients had postoperative neurological deterioration. The absolute value of r above 0.414 was adopted as diagnostic standard to predict postoperative neurological deterioration. Its sensitivity was 0.875, and specificity was 0.864. Correlation coefficients r was best predictors of postoperative neurological deterioration in our study. The meaning of correlation coefficient r need further study in a larger sample.