Abstract:
BACKGROUND:The diagnosis of postoperative cognitive dysfunction (POCD) requires complicated neuropsychological testing and is often delayed. Possible biomarkers for early detection or prediction are essential for the prevention and treatment of POCD. Preoperative screening of salivary cortisol levels may help to identify patients at elevated risk for POCD. METHODS:One hundred twenty patients >60 years of age and undergoing major noncardiac surgery underwent neuropsychological testing 1 day before and 1 week after surgery. Saliva samples were collected in the morning and the evening 1 day before surgery. POCD was defined as a Z-score of ≤-1.96 on at least 2 different tests. The primary outcome was the presence of POCD. The primary objective of this study was to assess the relationship between the ratio of AM (morning) to PM (evening) salivary cortisol levels and the presence of POCD. The secondary objective was to assess the relationship between POCD and salivary cortisol absolute values in the morning or in the evening. RESULTS:POCD was observed in 17.02% (16 of 94; 95% confidence interval [CI], 9.28%-24.76%) of patients 1 week after the operation. A higher preoperative AM/PM salivary cortisol ratio predicted early POCD onset (odds ratio [OR], 1.56; 95% CI, 1.20-2.02; P = .001), even after adjusting for the Mini-Mental Sate Examination score (odds ratio, 1.55; 95% CI, 1.19-2.02; P = .001). The area under the receiver operating characteristic curve for the salivary cortisol AM/PM ratio in individuals with POCD was 0.72 (95% CI, 0.56-0.88; P = .006). The optimal cutoff value was 5.69, with a sensitivity of 50% and specificity of 91%. CONCLUSIONS:The preoperative salivary cortisol AM/PM ratio was significantly associated with the presence of early POCD. This biomarker may have potential utility for screening patients for an increased risk and also for further elucidating the etiology of POCD.
journal_name
Anesth Analgjournal_title
Anesthesia and analgesiaauthors
Han Y,Han L,Dong MM,Sun QC,Zhang ZF,Ding K,Zhang YD,Mannan A,Xu YF,Ou-Yang CL,Li ZY,Gao C,Cao JLdoi
10.1213/ANE.0000000000003740subject
Has Abstractpub_date
2019-02-01 00:00:00pages
349-357issue
2eissn
0003-2999issn
1526-7598journal_volume
128pub_type
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