Plasma Orexin Levels Investigated for Correlation with Emergence Delirium in Elderly Patients

Emergence delirium (ED) is a common and distressing complication following general anesthesia, particularly in elderly patients. It manifests as acute confusion, agitation, and disorientation upon waking, increasing the risk of self-injury, prolonged hospital stays, and cognitive decline. Current diagnostic methods often rely on subjective clinical assessment. The orexin system (also known as hypocretin) plays a crucial role in regulating arousal, sleep-wake cycles, and cognitive function. Dysregulation of orexin has been implicated in various neurological and psychiatric conditions, suggesting it could be a biomarker for postoperative cognitive dysfunction like ED. Identifying an objective, measurable biomarker like plasma orexin could significantly improve early diagnosis and management strategies for ED.

This single-center, prospective, observational cohort study enrolled elderly patients undergoing general anesthesia. The primary objective was to explore the correlation between plasma orexin levels measured during the recovery period and the subsequent occurrence of emergence delirium. Researchers also aimed to evaluate the sensitivity and specificity of plasma orexin levels as an objective diagnostic indicator for ED. The study design focused on observing natural variations in orexin levels and their association with clinical outcomes, without any specific intervention.

The abstract title indicates this study aimed to explore a correlation between plasma orexin levels and emergence delirium, and to evaluate diagnostic utility. However, specific findings, statistical results, or quantitative data, such as correlation coefficients, p-values, or sensitivity/specificity metrics, are not provided in the available abstract. Therefore, no concrete results regarding the identified correlation or the diagnostic performance of orexin levels can be reported at this time.