Ryan Callahan, MD
Assistant Professor of Pediatrics (Cardiology) at the Children's Hospital of Philadelphia
Attending Physician, Division of Cardiology, Children's Hospital of Philadelphia
Director, Pulmonary Vein Stenosis Program, Children's Hospital of Philadelphia
Department: Pediatrics
Contact information
Children's Hospital of Philadelphia
3401 Civic Center Blvd
Philadelphia, PA 19104
3401 Civic Center Blvd
Philadelphia, PA 19104
Education:
BS (Biology; Minor in Psychology)
Pennsylvania State University, 2004.
MD
Drexel University College of Medicine, 2008.
Permanent linkBS (Biology; Minor in Psychology)
Pennsylvania State University, 2004.
MD
Drexel University College of Medicine, 2008.
Description of Clinical Expertise
Pulmonary Vein Stenosis, Congenital Interventional CardiologyDescription of Research Expertise
Pulmonary Vein Stenosis, Congenital Interventional CardiologySelected Publications
Callahan R, Gauvreau K, O’Byrne ML, Tang J, Keochakian M, Esch JJ, Porras D, Beroukhim R, Farias M, Harrild DM, Ireland CM, Kwatra N, Jenkins KJ: Predicting Outcome in Pediatric Pulmonary Vein Stenosis Using a Comprehensive Standardized Catheterization Assessment: Validation of the Invasive Pulmonary Vein Score (iPVS). J Soc Cardiovasc Angiogr Interv 2026.Asher M, O’Byrne ML, Callahan R, Mavroudis CD: Patients as a Limited Resource? Ethical Dilemmas in Pediatric Pulmonary Vein Stenosis. J Clin Ethics 2026.
Thatte N, Hammer PH, Marx G, Beroukhim R, Gauvreau K, Callahan R, Emani S, Hoganson D, del Nido P, Ghelani S: Biventricular Pressure-Volume Area Ratio: A Novel Predictor of Left Ventricular Preparedness for Double Switch Operation. JACC: Adv. 2026.
Naeem M, Rogers LS, O’Byrne ML, Giglia TM, Callahan R: Transcatheter Management of Native Aortic Root Thrombus Post-Fontan Palliation in a Pediatric Patient with COVID-19. JACC: Case Reports 2026.
Faraji E, Maeda K, Gupta M, Tang J, Smith CL, O’Byrne ML, Dori Y, Rome JJ, Gillespie MJ, Callahan R: Transcatheter Brachial Arteriovenous Fistula Creation in Stage 2 Palliated Single Ventricle Patients with Cyanosis. J Soc Cardiovasc Angiogr Interv 2026.
Kamsheh AM, Canter MW, Huecker J, Allam H, Aggarwal M, Callahan R, Miller, JR, Mokshagundam D, Berger JH, Canter CE, Hahn LG, Scheel J, Ybarra AM, Zanaboni DB, Balzer DT, O’Byrne ML, Glatz AC: Pulmonary Vein Stenosis in Pediatric Heart Transplant: Prevalence, Risk Factors and Outcome. J Heart Lung Transplant 2026.
Choi C, Callahan R: Transcatheter Management of Pulmonary Vein Stenosis in Children. Pediatr Cardiol December 2025.
Meluskey H, Blowey B, O’Brien AB, O’Byrne ML, Rome JJ, Frank DB, Avitabile CM, Gupta M, Tang J, Bulter KL, Mavroudis CD, Fuller S, Callahan R: Systemic Sirolimus Monitoring in Pediatric Pulmonary Vein Stenosis. Pediatr Cardiol Page: doi: 10.1007, Oct 2025 Notes: epub ahead of print.
O’Byrne ML, Kennedy KF, Callahan R, Dori Y, Rome JJ, Smith CL, Tang J, Gillespie MJ, Janson CM: Evaluating Racial Disparities in Access to Common Pediatric/Congenital Transcatheter Interventions. JACC: Adv 11(1): 102158, Sep 2025.
Dori Y, Pinto E, Biroc L, Gillespie MJ, Callahan R, Tang J, O’Byrne ML, Ford B, Vaiyani D, DeWitt AG, Merrill D, Shinde D, Faville E, Shustak R, Escobar FA, Krishnamurthy G, Srinivasan A, Rome JJ, Smith CL: Percutaneous Thoracic Duct Externalization and Autotransfusion in Patients with Lymphatic Failure due to Elevated Central Venous Pressure Circ Cardiovasc Interv 4(1): e015336, Sep 2025.