Postoperative Delirium Clinical Trial
Official title:
Association of Plasma Biomarkers for Neurological Injury and Postoperative Delirium After Cardiac Surgery
Delirium is one of the most common complications after cardiac surgeries, incidence of which is 20~70%. Causes and pathophysiology of delirium has not been elucidated yet, however, inflammatory response of the nervous system, imbalance of neurotransmitters and ischemia-reperfusion injury of brain tissue are thought to play a big role. 'Neurofilament light (Nfl)' and 'Tau' are proteins that comprise neurons, which are released into blood during acute brain injury. Increased serum concentrations of these markers are acknowledged to be associated with worse clinical outcomes in patients with acute brain injury. These proteins are also closely linked to degenerative changes in the nervous system and cognitive decline in Alzheimer's disease. Therefore, the increase in blood levels of 'Nfl' and 'Tau' may be related to the development of delirium. The aim of this study is to investigate the association between 'Nfl' and 'Tau', serum markers of damage of the nervous system, and the development of delirium after cardiac surgery.
1. Assessment of cognitive function and delirium Before the day before surgery, K-MMSE (Korean version of Mini-Mental State Exam) is conducted to check the subjects' baseline cognitive function. From the postoperative day 0 to 7, CAM-ICU (Confusion Assessment Method for the Intensive Care Unit) for mechanically ventilated patients, or 3D-CAM (3-minute diagnostic assessment for delirium using the Confusion Assessment Method) for extubated patients is performed twice a day to assess whether delirium occurs. Records of the nurses are also checked. 2. Measurement of the serum levels of Nfl and Tau Serum concentrations of Nfl and Tau are measured after anesthetic induction, and at postoperative 6 hours ;
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