261 Sleep and Frailty: Examining the Effects of Frailty on Sleep Disturbance in Hospitalised Older Adults

Background Sleep disturbance is common in hospital, potentially resulting in poor clinical outcomes. Frailty is similarly prevalent and associated with multiple adverse events. Despite this, little is known about the interaction between frailty and sleep among older hospital inpatients. Methods Consecutive, non-critically ill patients aged ≥70, admitted medically through a large university hospital emergency department (ED) during the preceding 24 hours, were evaluated with measures assessing overnight sleep quality (Richards Campbell Sleep Questionnaire/RCSQ), baseline sleep (Pittsburgh Sleep Quality Index/PSQI) and insomnia (Insomnia Severity Index/ISI). Additional variables included medications, frailty (PRISMA-7 scores ≥3 and Clinical Frailty Scale/CFS scores ≥5), functional and cognitive status, and night-time noise levels. Patients were reassessed 48 hours later. Results Over four weeks, 152 patients, mean age 80 (±6.8) years were included; 61% were male (n=92). In all, 43% were frail (mean CFS score 4.23±1.6), median PRISMA-7 score 4±4; a further 24% were pre-frail. The median Charlson Comorbidity Index score was 6±2. The majority, 72% (110/152), reported impaired baseline sleep quality (PSQI ≥5) and 13% (20/152) had clinical insomnia (ISI ≥15). The median time spent in ED was 23±13 hours, median duration asleep was only one hour (range 0-8). After adjusting for possible confounders, frailty status was significantly associated with lower PSQI (p<0.001) but not ISI (p=0.07) and RCSQ (p=0.07) scores. Frail patients were twice as likely to report poor baseline sleep OR 2, (95% CI:1.3-3.2). Baseline and overnight sleep disturbance were not associated with prolonged length of stay (LOS) or 30-day readmission rates. Conclusion The prevalence of sleep disturbance and clinical insomnia among older adults admitted through ED is high and overnight sleep quality low, although these did not impact on LOS or 30-day re-admission rates. Frail patients reported significantly poorer baseline sleep but did not have higher rates of insomnia or experience worse overnight sleep.