Associations between hyper-polypharmacy and potentially inappropriate prescribing with clinical and functional outcomes in older adults

Background: Hyper-polypharmacy and potentially inappropriate prescribing (PIP) are common among older inpatients. This study investigated associations between hyper-polypharmacy and PIP with clinical and functional outcomes in older adults at 3-months after hospital discharge. Research design and method: At discharge, prescribed medications were collected and PIPs, comprising potentially inappropriate medications (PIM) and potential prescribing omissions (PPO), were retrospectively identified using STOPP/START version 2. Outcomes were collected prospectively via telephone follow-up and audit. Results: Data for 232 patients (mean age 80 years) were analyzed. PIP prevalence at discharge was 73.7% (PIMs 62.5%, PPOs 36.6%). Exposure to at least 1 PIM was associated with an increased occurrence of unplanned hospital readmission (adjusted odds ratio (AOR) 5.09; 95% CI 2.38─10.85), emergency department presentation (AOR 4.69; 95% CI 1.55─14.21) and the composite outcome (AOR 6.83; 95% CI 3.20─14.57). The number rather than the presence of PIMs was significantly associated with increased dependency in at least 1 activity of daily living (ADL) (AOR 2.31; 95% CI 1.08─4.20). Increased PIP use was associated with mortality (AOR 1.45; 95% CI 1.05─1.99). Conclusion: PIPs overall, and PIMs specifically, were frequent in older adults at hospital discharge, and were associated with increased re-hospitalizations and dependence in ADLs at 3-months post-discharge.