Postoperative delirium, a common complication in the elderly, can occur following any type of surgery and is associated with increased morbidity and mortality; it may also be associated with subsequent cognitive problems. Effective therapy for postoperative delirium remains elusive because the causative factors of delirium are likely multiple and varied.
Patients ≥ 65 years old undergoing elective knee arthroplasty were prospectively evaluated for postoperative Diagnostic and Statistical Manual of Mental Disorders-IV delirium. Exclusion criteria included dementia, mini-mental state exam score<24, delirium, clinically significant CNS/neurological disorder, current alcoholism, or any serious psychiatric disorder. Delirium was assessed on postoperative days 2 and 3 using standardized scales. Patients’ pre-existing medical conditions were obtained from medical charts. The occurrence of obstructive sleep apnea (OSA) was confirmed by contacting patients to check their polysomnography records. Data were analyzed using Pearson Chi-Square or Wilcoxon Rank Sum tests and multiple logistic regressions adjusted for effects of covariates.
Of 106 enrolled patients, 27 (25%) developed postoperative delirium. Of the 15 patients with obstructive sleep apnea, 8 (53%) experienced postoperative delirium, compared to 19 (20%) of the patients without obstructive sleep apnea (p=0.0123, OR: 4.3). Obstructive sleep apnea was the only statistically significant predictor of postoperative delirium in multivariate analyses.
This is the first prospective study employing validated measures of delirium to identify an association between pre-existing obstructive sleep apnea and postoperative delirium.