The emergency department (ED) is a critical source of care for opioid-addicted patients, and emergency physicians are in a unique position to treat addiction. Patients in the control group had a median 2 ED revisits (range 0-9), 0 rehospitalizations (0-8), and 0 overdoses (0-2), versus median 2 ED revisits (0-8), 0 rehospitalizations (0-4), and 0 overdoses (0-6). Conclusion: Our finding that pericarditis accounts for 2.1% of ED cardiac chest pain visits is not consistent with previous reports that acute pericarditis accounts for 5% of ED cardiac chest pain visits. Results: Of 84,567 patients visiting the ED with the chief complaint of chest pain, 8169 (9.7%) were seen for cardiac chest pain, and 168 (0.20%) were diagnosed with pericarditis; of those, 29 (17.3%) were found to have recurrent pericarditis.