Resting-State Functional Connectivity and Cognition After Major Cardiac Surgery in Older Adults without Preoperative Cognitive Impairment: Preliminary Findings
| Autor: | Patrick Smith, Jeffrey N. Browndyke, John H. Alexander, Joseph P. Mathew, WD White, Todd B. Harshbarger, Mark F. Newman, Tiffany L. Bisanar, Miles Berger, Kathleen A. Welsh-Bohmer, Jeffrey G. Gaca |
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| Rok vydání: | 2016 |
| Předmět: |
Male
medicine.medical_specialty Rest 030204 cardiovascular system & hematology Neuropsychological Tests Article 03 medical and health sciences 0302 clinical medicine Physical medicine and rehabilitation Postoperative Complications Functional neuroimaging Medicine Humans Cognitive Dysfunction Default mode network Aged Academic Medical Centers Resting state fMRI medicine.diagnostic_test business.industry Cardiovascular Surgical Procedures Functional Neuroimaging Brain Cognition Perioperative medicine.disease Magnetic Resonance Imaging Posterior cingulate Case-Control Studies Physical therapy Female Geriatrics and Gerontology business Functional magnetic resonance imaging Postoperative cognitive dysfunction 030217 neurology & neurosurgery |
| Zdroj: | Journal of the American Geriatrics Society. 65(1) |
| ISSN: | 1532-5415 |
| Popis: | Objectives To look for changes in intrinsic functional brain connectivity associated with postoperative changes in cognition, a common complication in seniors undergoing major surgery, using resting-state functional magnetic resonance imaging. Design Objective cognitive testing and functional brain imaging were prospectively performed at preoperative baseline and 6 weeks after surgery and at the same time intervals in nonsurgical controls. Setting Academic medical center. Participants Older adults undergoing cardiac surgery (n = 12) and nonsurgical older adult controls with a history of coronary artery disease (n = 12); no participants had cognitive impairment at preoperative baseline (Mini-Mental State Examination score >27). Measurements Differences in resting-state functional connectivity (RSFC) and global cognitive change relationships were assessed using a voxel-wise intrinsic connectivity method, controlling for demographic factors and pre- and perioperative cerebral white matter disease volume. Analyses were corrected for multiple comparisons (false discovery rate P < .01). Results Global cognitive change after cardiac surgery was significantly associated with intrinsic RSFC changes in regions of the posterior cingulate cortex and right superior frontal gyrus—anatomical and functional locations of the brain's default mode network (DMN). No statistically significant relationships were found between global cognitive change and RSFC change in nonsurgical controls. Conclusion Clinicians have long known that some older adults develop postoperative cognitive dysfunction (POCD) after anesthesia and surgery, yet the neurobiological correlates of POCD are not well defined. The current results suggest that altered RSFC in specific DMN regions is positively correlated with global cognitive change 6 weeks after cardiac surgery, suggesting that DMN activity and connectivity could be important diagnostic markers of POCD or intervention targets for potential POCD treatment efforts. |
| Databáze: | OpenAIRE |
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