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The association between decrease in cerebral oxygen saturation during cardiac surgery and postoperative cognitive dysfunction: secondary analysis of a randomised trial

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BACKGROUND: Postoperative cognitive dysfunction (POCD) occurs commonly after cardiac surgery. Near-infrared spectroscopy (NIRS) has been used to monitor regional cerebral oxygen saturation (rScO2) in order to minimise the occurrence of POCD by applying dedicated interventions when rScO2 decreases. However, the association between rScO2 intraoperatively and POCD has not been clarified.

METHODS: This is a secondary analysis of a randomised trial with physician-blinded NIRS monitoring and cognitive testing at discharge from hospital and at 3 months after surgery. The association between intraoperative rScO2 values and POCD at discharge from hospital and at 3 months after surgery was investigated. The prespecified candidate predictive variable of interest was cumulative time during surgery with rScO2 ≥10% below its preoperative value.

RESULTS: One hundred and fifty-three patients had complete NIRS data and neurocognitive assessments at discharge, and 44 of these patients (29%) had POCD. At 3 months, 148 patients had complete data, and 12 (8%) of these patients had POCD. The median time with rScO2 >10% below preoperative values did not differ for patients with and without POCD at discharge (difference=0.0 min; Hodges-Lehmann 95% confidence interval, -3.11-1.47, P=0.88). Other rScO2 time thresholds that were assessed were also not significantly different between those with and without POCD at discharge. This applied both to absolute rScO2 values and relative changes from preoperative values. Similar results were found in relation to POCD at 3 months.

CONCLUSIONS: No significant association was found between intraoperative rScO2 values and POCD. These findings bring into question the rationale for attempting to avoid decreases in rScO2 if the motivation is to prevent POCD.

CLINICAL TRIAL REGISTRATION: NCT02185885.

Original languageEnglish
JournalBritish Journal of Anaesthesia
ISSN0007-0912
DOIs
Publication statusPublished - 2019

ID: 57348548