Prehospital Opioid Dosing and Downstream Outcomes in Older Adults

Key Takeaways

• Older adults who received EMS-administered opioid analgesics before arrival were evaluated in a retrospective cohort study.
• Emergency department and hospital outcomes after that prehospital exposure were assessed, including specific safety-related endpoints.
• Higher opioid doses were associated with increased risk of altered responsiveness and delirium, while some outcomes showed no difference between dose groups.

Opioid doses were classified as low, therapeutic, or high based on maximum single and cumulative weight-based dosing.

Safety-related outcomes were also part of the analysis, including altered responsiveness, delirium, hypoxia, 30-day mortality, and emergency department length of stay. The study centered on how opioid treatment during EMS care related to what followed after patients reached the ED, with adjusted analyses accounting for patient and clinical characteristics. The emphasis remained on the acute-care trajectory across emergency and hospital settings rather than on any single endpoint or treatment comparison.

Indexed in an emergency medicine journal, the study focused on older adults receiving EMS-administered opioid analgesics before ED arrival. The exposure occurred in the field, and outcome assessment extended into subsequent emergency and hospital care. A total of 6406 patients were included, with 11.7% receiving high doses, 57.2% therapeutic doses, and 31.2% low doses. Outcomes were compared using regression models with adjusted risk ratios.

Emergency department and hospital outcomes were the main domains assessed after prehospital opioid administration in older adults. Receipt of a high opioid dose was associated with increased risk of altered responsiveness (adjusted risk ratio approximately 1.28) and delirium (adjusted risk ratio approximately 2.4 to 2.65) compared with low or therapeutic doses. There was no difference between dose groups in hypoxia, death within 30 days, or emergency department length of stay.

Safety remained part of the study question, with specific adverse events identified and analyzed. The reported associations reflect observational findings and do not establish causality.

Overall, the study supports associations between higher prehospital opioid dosing and certain adverse outcomes in older adults, while showing no differences in other measured endpoints.