Abstract
Despite increasing numbers of older adults undergoing surgery and the known risks of opioids, little is known about the potential association between opioid prescribing and serious falls and fall-related injuries after surgery. To determine the incidence and risk factors of serious falls and fall-related injuries after elective, outpatient surgery. Retrospective cohort study of 20% national sample of Medicare claims among beneficiaries ≥ 65years of age with Medicare Part D claims and who underwent elective outpatient surgery from January 1, 2009, through December 31, 2014. Opioid-naïve patients ≥ 65years undergoing elective, minor, outpatient surgical procedures. The exposure was opioid prescription fills in the perioperative period (i.e., 30days before up until 3days after surgery) converted to total oral morphine equivalents (OME) over a period 30days prior to and 30days after surgery. Serious falls and fall-related injuries within 30days after surgery, examined through Poisson regression analysis with reported fall and fall-related injury rates adjusted for potential confounders. Among 44,247 opioid-naïve surgical patients, 76.3% filled an opioid prescription in the perioperative period. Overall, 0.62% of patients suffered a serious fall or fall-related injury within 30days after surgery. Risk factors for serious falls or fall-related injuries after surgery included older age (80-84years: RR 1.64, 95% CI 1.12-2.40; 85years and older: RR 1.81, 95% CI 1.25-2.86), female sex (RR 3.04, 95% CI 2.29-4.05), Medicaid eligibility (RR 1.63, 95% CI 1.17-2.26), and higher amounts of opioids filled following surgery (≥ 225 OME: RR 2.29, 95% CI 1.72-3.07). Serious falls after elective, outpatient surgery are uncommon, but correlated with age, sex, Medicaid eligibility, and the amount of opioids filled in the perioperative period. Judicious prescribing of opioids after surgery is paramount and is an opportunity to improve the safety of surgical care among older individuals.
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