Prehospital Chest Pain Management: Disparity Based on Homeless Status.

Background: People experiencing homelessness may utilize emergency medical services to access health care. We sought to examine the relationship between homelessness and prehospital evaluation and treatment of chest pain. Methods: We obtained 2019 data of all EMS activations from a single 9-1-1 provider in San Francisco, CA with a clinician's primary impression of chest pain. Using chart review, we categorized patients as experiencing homelessness or not and determined treatment rates between the two groups based on local chest pain/acute coronary syndrome protocol. We then stratified the two groups based on primary impression subcategories: 'chest pain - not cardiac' and 'chest-pain - cardiac/STEMI'. Results: 601 chest pain calls were analyzed after excluding non-transports and pediatric patients. 120 incidents (20%) involved patients experiencing homelessness. Across all chest pain impressions, people experiencing homelessness were less likely to receive aspirin (35% vs. 53%; p  < 0.001), intravenous access (38% vs. 62%; p  < 0.001), and nitroglycerin (21% vs. 39%; p  < 0.001). No patients experiencing homelessness received analgesic medication, though only 4% of other patients received this intervention (0% vs 4%; p  = 0.020). People experiencing homelessness were more likely to receive a clinical impression of 'chest pain - not cardiac' compared to 'chest pain - cardiac/STEMI' (68% vs. 32%; p  < 0.001). Results were less significant in most fields when adjusted for impression sub categorizations: 'chest pain - not cardiac' vs 'chest pain - cardiac/STEMI'. Greater than 97% of all patients received 12 lead electrocardiograms. Conclusions: Significant disparities were observed between patients experiencing and not experiencing homelessness in the prehospital treatment of chest pain. Larger scale evaluations are needed to further assess potential disparities in care for people experiencing homelessness in the prehospital setting. Using prehospital clinician impression as a proxy for acuity may mask existing bias and disparity; however, 12-lead ECG acquisition, the key diagnostic tool, was appropriately performed in more than 97% of all chest pain patients.