The relationship between sleep quality and surgical recovery has gained new urgency as populations age and surgical volumes increase. Poor preoperative sleep may be modifiable risk factor that significantly amplifies cognitive complications following major surgery in older adults, potentially offering a targeted intervention window.
This prospective analysis of 535 patients aged 60 and older revealed that those with disturbed sleep patterns before surgery experienced substantially elevated rates of postoperative cognitive dysfunction across all measured timepoints. Patients with Pittsburgh Sleep Quality Index scores above 7 demonstrated 44% higher cognitive impairment rates at one week, climbing to 75% higher rates at six months post-surgery. The sleep-disrupted group also faced 43% increased delirium risk and markedly diminished recovery quality scores. Most concerning, over one-third maintained persistent insomnia at six months, suggesting a self-perpetuating cycle of cognitive and sleep dysfunction.
These findings challenge the traditional view of preoperative sleep disturbance as merely a comfort issue, repositioning it as a critical risk stratification tool. The dose-response relationship between sleep quality scores and cognitive outcomes suggests potentially reversible pathophysiology. Poor sleep likely compromises neural resilience through inflammatory pathways, oxidative stress, and impaired glymphatic clearance—mechanisms that become increasingly vulnerable with advancing age. The persistence of cognitive effects through six months indicates this represents more than transient surgical stress. For surgical programs serving aging populations, preoperative sleep assessment and intervention may prove as essential as cardiac or pulmonary optimization. However, this observational study cannot establish whether treating sleep disturbances would prevent cognitive decline, making randomized intervention trials the critical next step.