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Photo of  Richard J. Ryan, MD

Richard J. Ryan, MD

Professor of Clinical

Vice Chair, Operations

Emergency Medicine | College of Medicine

  • Residency: University of Cincinnati/University Hospital
  • Medical Degree: New York Medical College
  • Bachelor of Science : Boston College (Biology)
Board Certifications & Licenses

American Board of Emergency Medicine (Certification Date: 1995-06-30) - (Recertification Date: 2016-01-01)


Emergency Medicine

Contact Information

Clinical Interests

Emergency Medicine


Peer Reviewed Publications

Adler, David; Abar, Beau; Durham, Danielle D; Bastani, Aveh; Bernstein, Steven L; Baugh, Christopher W; Bischof, Jason J; Coyne, Christopher J; Grudzen, Corita R; Henning, Daniel J; Hudson, Matthew F; Klotz, Adam; Lyman, Gary H; Madsen, Troy E; Pallin, Daniel J; Reyes-Gibby, Cielito C; Rico, Juan Felipe; Ryan, Richard J; Shapiro, Nathan I; Swor, Robert; Thomas, Charles R; Venkat, Arvind; Wilson, Jason; Yeung, Sai-Ching Jim; Caterino, Jeffrey M 2019. Validation of the Emergency Severity Index (Version 4) for the Triage of Adult Emergency Department Patients With Active Cancer. The Journal of emergency medicine, 57 3, 354-361

Butler, Megan M; Ancona, Rachel M; Beauchamp, Gillian A; Yamin, Cyrus K; Winstanley, Erin L; Hart, Kimberly W; Ruffner, Andrew H; Ryan, Shawn W; Ryan, Richard J; Lindsell, Christopher J; Lyons, Michael S 2016. Emergency Department Prescription Opioids as an Initial Exposure Preceding Addiction. Annals of emergency medicine, 68 2, 202-8

Fertel, Baruch S; Hart, Kimberly W; Lindsell, Christopher J; Ryan, Richard J; Lyons, Michael S 2015. Patients who use multiple EDs: quantifying the degree of overlap between ED populations. The western journal of emergency medicine, 16 2, 229-33

Fertel, Baruch S; Hart, Kimberly W; Lindsell, Christopher J; Ryan, Richard J; Lyons, Michael S 2012. Toward understanding the difference between using patients or encounters in the accounting of emergency department utilization. Annals of emergency medicine, 60 6, 693-8

Ryan, Richard J; Lindsell, Christopher J; Hollander, Judd E; O'Neil, Brian; Jackson, Raymond; Schreiber, Donald; Christenson, Robert; Gibler, W Brian 2009. A multicenter randomized controlled trial comparing central laboratory and point-of-care cardiac marker testing strategies: the Disposition Impacted by Serial Point of Care Markers in Acute Coronary Syndromes (DISPO-ACS) trial. Annals of emergency medicine, 53 3, 321-8

Ryan, Richard J; Lindsell, Chris; Sheehan, Paul 2008. Fluoroquinolone resistance during 2000-2005: an observational study. BMC infectious diseases, 8 , 71

Han, Jin H; Lindsell, Christopher J; Ryan, Richard J; Gibler, W Brian 2005. Changes in cardiac troponin T measurements are associated with adverse cardiac events in patients with chronic kidney disease. The American journal of emergency medicine, 23 4, 468-73