Nicolas Leth Madsen, MD $$

Pediatric Cardiologist

Professor at UT Southwestern Medical Center
Division Director at Children's Health

Languages Spoken:


UT Southwestern Pediatric Group

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Nicolas Madsen, M.D., is the Co-Director of The Heart Center and Chief of Cardiology at Children’s Health℠. He is also a Professor of Cardiology at UT Southwestern. As a pediatric cardiologist, he cares for children who have congenital and acquired heart conditions and adult patients who have congenital heart disease. 

He earned his medical degree at University of Washington School of Medicine, where he also completed his residency training in pediatrics and his fellowship training in pediatric cardiology. Prior to his arrival at Children’s Health, Dr. Madsen was the Medical Director of the Heart Institute at Cincinnati Children’s Hospital.

I can think of no greater profession than pediatric cardiology.
Dr. Madsen

“I can think of no greater profession than pediatric cardiology. The opportunities for positive and lasting impact are evident everywhere and across the lifespan. It is a privilege to provide the most advanced clinical care for the benefit of newborns with congenital heart disease. It is inspiring to assist patients and families as they navigate the complex journey from child to adult. It is with deep gratitude that I recognize the privilege of being a pediatric cardiologist.”

Dr. Madsen is a nationally recognized leader and researcher who works to improve the quality of life for children with congenital heart disease. He co-founded the Pediatric Acute Care Cardiology Collaborative (PAC3) and serves as Executive Director. The goal of this organization is to help children hospitalized with heart conditions achieve better outcomes through traditional research and quality improvement science. His dedication to children’s heart health has previously earned him the Heart Hero Award from the advocacy group Conquering Congenital Heart Disease and the Clinical Care Award from Cincinnati Children’s Hospital.

Dr. Madsen enjoys spending time with his family, discovering new trails, and searching for the world’s best breakfast burrito. In addition to English, he speaks Danish.

Education and Training

Medical School
University of Washington School of Medicine (2005)
University of Washington (2008), Pediatrics
University of Washington (2012), Pediatric Cardiology
Graduate School
University of Washington School of Public Health (2011)
Board Certification
American Board of Pediatrics/Pediatric Cardiology


Departments and Programs

  • Research Interests

    • Pediatric acute care cardiology
    • Long-term outcomes in congenital heart disease
    • Quality improvement science
  • Publications

    • Reduction in myocardial strain is evident in adolescents and young adults with obesity and type 2 diabetes. Haley JE, Zhiqian G, Philip KR, Nicolas ML, Thomas KR, Lawrence DM, Elaine UM, Pediatric diabetes 2020 03 21 2 243-250
    • The Pediatric Heart Network Residual Lesion Score Study: Design and objectives. Nathan M, Trachtenberg FL, Van Rompay MI, Gaynor W, Kanter K, Ohye R, Bacha EA, Tweddell J, Schwartz SM, Minich LL, Mery CM, Colan SD, Levine J, Lambert LM, Newburger JW, The Journal of thoracic and cardiovascular surgery 2020 07 160 1 218-223.e1
    • Center Variation in Chest Tube Duration and Length of Stay After Congenital Heart Surgery. Bates KE, Madsen NL, Khadr L, Gao Z, Crawford K, Gaies M, Graupe M, Hanke SP, Hlavacek AM, Morell E, Pasquali SK, Russell JL, Schachtner SK, Tanel RE, Ware AL, Kipps AK, The Annals of thoracic surgery 2020 07 110 1 221-227
    • Time series evaluation of improvement interventions to reduce alarm notifications in a paediatric hospital. Pater CM, Sosa TK, Boyer J, Cable R, Egan M, Knilans TK, Schondelmeyer AC, Schuler CL, Madsen NL, BMJ quality & safety 2020 09 29 9 717-726
    • Intensive Care Unit and Acute Care Unit Length of Stay After Congenital Heart Surgery. Hart SA, Tanel RE, Kipps AK, Hoerst AK, Graupe MA, Cassidy SC, Hlavacek AM, Clabby ML, Bush LB, Zhang W, Banerjee MM, Pasquali SK, Gaies M, Madsen N, The Annals of thoracic surgery 2020 10 110 4 1396-1403
    • Comparison of Economic Self-Sufficiency and Educational Attainment in Adults With Congenital Heart Disease Versus Siblings Without Heart Disease and to General Population. Madsen NL, Marino BS, Woo JG, Olsen M, The American journal of cardiology 2020 11 135 135-142
    • Congenital Heart Disease and Risk of Central Nervous System Infections: A Nationwide Cohort Study. Bagge CN, Smit J, Madsen NL, Olsen M, Pediatric cardiology 2020 Jun 41 5 869-876
    • Health literacy and caregiver understanding in the CHD population. Rodts ME, Unaka NI, Statile CJ, Madsen NL, Cardiology in the young 2020 Oct 30 10 1439-1444
  • Professional Activities

    • American Academy of Pediatrics
    • American College of Cardiology
    • American Heart Association
    • Dallas County Medical Society
    • Pediatric Cardiac Critical Care Consortium
    • Pediatric Congenital Heart Association
    • Pediatric Heart Network
  • Awards and Honors

    • Cincinnati Top Doctors 2020
    • Top Abstract (CVDY) 2019, American Heart Association Scientific Sessions
    • Cincinnati Top Doctors 2019
    • Patient Education Advocacy Award 2018, Home Care for Heart Health
    • Clinical Care Achievement Award 2017, Cincinnati Children’s Hospital
    • Heart Hero Award 2017, Pediatric Congenital Heart Association
    • Make a Difference Award 2016, Cincinnati Children’s Hospital
    • Early Bird Career (Specialty Focus) Best Poster 2015, American Heart Association Scientific Sessions
    • Advocacy Day Training Scholarship Award 2015, AAP Section on Cardiology and Cardiac Surgery
    • Third Place Abstract 2014, 24th Annual Symposium on the Adult with Congenital Heart Disease
    • Outstanding Fellow Teaching Award 2012, Seattle Children’s Hospital
    • Young Investigator Award Finalist 2011, AAP Section on Cardiology and Cardiac Surgery
    • Education Travel Grant Recipient 2011, AAP Section on Cardiology and Cardiac Surgery
    • Corkey Travel Award 2011, Seattle Children’s Hospital, University of Washington School of Medicine
    • Fellow’s Teaching Award 2011, Seattle Children’s Hospital
    • Cardiology Outstanding Investigator Award 2010, Children’s Hospital of Philadelphia
    • Young Investigator’s Travel Award 2010, Pediatric Academic Society Annual Meeting
    • Loan Repayment Program Recipient 2009-2011, National Institute of Health
    • Outstanding Clinical Research Award 2010-2012, Seattle Children’s Fellow’s College Research Day
    • Travel Grant 2009, Department of Clinical Epidemiology, University of Aarhus, Denmark

Where I Provide Care: