Comparison of different metrics of cerebral autoregulation in association with major morbidity and mortality after cardiac surgery

Cardiac surgery studies have established the clinical relevance of personalised arterial blood pressure management based on cerebral autoregulation. However, variabilities exist in autoregulation evaluation. We compared the association of several cerebral autoregulation metrics, calculated using dif...

Full description

Saved in:
Bibliographic Details
Published inBritish journal of anaesthesia : BJA Vol. 129; no. 1; pp. 22 - 32
Main Authors Liu, Xiuyun, Donnelly, Joseph, Brady, Ken M., Akiyoshi, Kei, Bush, Brian, Koehler, Raymond C., Lee, Jennifer K., Hogue, Charles W., Czosnyka, Marek, Smielewski, Peter, Brown, Charles H.
Format Journal Article
LanguageEnglish
Published England Elsevier Ltd 01.07.2022
Elsevier
Subjects
Online AccessGet full text

Cover

Loading…
More Information
Summary:Cardiac surgery studies have established the clinical relevance of personalised arterial blood pressure management based on cerebral autoregulation. However, variabilities exist in autoregulation evaluation. We compared the association of several cerebral autoregulation metrics, calculated using different methods, with outcomes after cardiac surgery. Autoregulation was measured during cardiac surgery in 240 patients. Mean flow index and cerebral oximetry index were calculated as Pearson's correlations between mean arterial pressure (MAP) and transcranial Doppler blood flow velocity or near-infrared spectroscopy signals. The lower limit of autoregulation and optimal mean arterial pressure were identified using mean flow index and cerebral oximetry index. Regression models were used to examine associations of area under curve and duration of mean arterial pressure below thresholds with stroke, acute kidney injury (AKI), and major morbidity and mortality. Both mean flow index and cerebral oximetry index identified the cerebral lower limit of autoregulation below which MAP was associated with a higher incidence of AKI and major morbidity and mortality. Based on magnitude and significance of the estimates in adjusted models, the area under curve of MAP < lower limit of autoregulation had the strongest association with AKI and major morbidity and mortality. The odds ratio for area under the curve of MAP < lower limit of autoregulation was 1.05 (95% confidence interval, 1.01–1.09), meaning every 1 mm Hg h increase of area under the curve was associated with an average increase in the odds of AKI by 5%. For cardiac surgery patients, area under curve of MAP < lower limit of autoregulation using mean flow index or cerebral oximetry index had the strongest association with AKI and major morbidity and mortality. Trials are necessary to evaluate this target for MAP management.
Bibliography:ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:0007-0912
1471-6771
DOI:10.1016/j.bja.2022.03.029