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Ciaran S. O’Brien, MD
General Surgery Resident

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Department of Surgery
4 Maloney
3400 Spruce Street
Philadelphia, PA 19104

Administrative Telephone: 215-662-6156

Contact Information (internal use only)



Ciaran is a PGY-1 general surgery resident at UPENN. Prior to UPENN he completed medical school at Columbia University College of Physicians and Surgeons, a post bacc program at Bryn Mawr College, and a BA at St. John’s College in Annapolis, MD. He is currently interested in trauma/intensive care surgery, general thoracic surgery and vascular surgery.

2016 - present Assistant Instructor in Surgery
2016 Columbia University College of Physicians and Surgeons
2010 - 2011 Bryn Mawr College, Bryn Mawr, Pennsylvania
Postbaccalaureate Premedical Program
2008 St. John's College, Annapolis, Maryland
Bachelor of Arts, Liberal Arts
2015 - 2016 Scholarly Projects Program
Clinical and Translational Research in Extracorporeal Mechanical Oxygenation with William Middlesworth, MD
September 2011 -
July 2012
NY Obesity Nutrition Research Center, St. Luke’s-Roosevelt, NYC
Research assistant, studied hormonal changes as relates to diabetes remission after bariatric surgery
  1. O’Brien C., Monteagudo J., Schad C., Cheung E., Middlesworth W., (2016) Centrifugal Pumps and Hemolysis in Pediatric Extra-Corporeal Membrane Oxygenation (ECMO) Patients: an Analysis of Extracorporeal Life Support Organization (ELSO) Registry Data. Accepted for Presentation at the Annual American Academy of Pediatrics, Section on Surgery. October 2016, San Francisco, CA.
  2. Bain J., Monteagudo J., Schad C., Fallon B., O’Brien C., Cheung E., Middlesworth W., Riviello J., McDonough T.. (2015). A 5-year retrospective study of EEG and neurological outcomes children undergoing ECMO at a quaternary care center Poster presented at: Annual Meeting of the American Epilepsy Society; Philadelphia, PA.
  3. Dutia R, Embrey M, O’Brien CS, et al. Temporal changes in bile acid levels and 12α-hydroxylation after Roux-en-Y gastric bypass surgery in type 2 diabetes. Int J Obes (Lond). 2015;39(5):806–13. doi:10.1038/ijo.2015.1.
  4. O’Brien CS, Wang G, McGinty J, et al. Effects of gastrogastric fistula repair on weight loss and gut hormone levels. Obes Surg. 2013;23(8):1294–301. doi:10.1007/s11695-013-0917- z.
  5. Bunker P., Johnson-Black P., Carpentier AC., Wang G., Agenor K., Paultre P., Embrey M., OBrien C., Colarusso A., Laferrère
B.. (2012). Prehepatic insulin secretion rate 3 years after GBP in patients with T2DM Presented at: 30th Annual meeting of the Obesity Society; San Antonio, TX.

Ciaran O'Brien

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