"My hope for all my patients is that they feel comforted and supported when they come to see me."

EDUCATION

Undergraduate School
  • Queen's University
Medical Degree
  • McMaster Medical School , Hamilton, ON , CANADA

Internship

  • Johns Hopkins Hospital , Baltimore , MD

Graduate Degree

  • Johns Hopkins Hospital , Baltimore , MD

Fellowship

Pediatric Cardiology
  • Boston Children's Hospital , Boston , MA

Fellowship

Senior - Electrophysiology
  • Boston Children's Hospital , Boston , MA

When patients come to Boston Children’s Hospital, they are seeking our help, often at a frightening or vulnerable time in their lives.

Being evaluated for a heart condition, even if you ultimately come up with a clean bill of health, can be an incredibly stressful experience.  My hope for all my patients is that they feel comforted and supported when they come to see me - that they feel we are partners in this together, walking side-by-side, step-by-step through the highs and lows that inevitably come with any medical issue.

PROFESSIONAL HISTORY

Dr. Mah completed medical school at McMaster University and his pediatric residency training at Johns Hopkins in Baltimore, Maryland.  He then completed his cardiology fellowship at Boston Children’s Hospital, followed by a senior fellowship in pediatric and congenital electrophysiology.  Dr. Mah is currently a member of the Electrophysiology Division at Boston Children’s Hospital, and is Director of the Pacemaker and Defibrillator program.  Dr. Mah sees patients with heart rhythm disorders, both in the inpatient and outpatient setting, while also performing complex arrhythmia ablations and pacemaker/defibrillator implants in our state-of-the-art catheterization and device labs.  His research is focused on the use of cardiac resynchronization devices and the creation a pacemaker/defibrillator registry to optimize patient care and follow-up in the New England area.

PUBLICATIONS

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  1. Meziab O, Abrams DJ, Alexander ME, Bevilacqua L, Bezzerides V, Mah DY, Walsh EP, Triedman JK. Utility of incomplete right bundle branch block as an isolated ECG finding in children undergoing initial cardiac evaluation. Congenit Heart Dis. 2018 Feb 12. View abstract
  2. Chambers KD, Beausejour Ladouceur V, Alexander ME, Hylind RJ, Bevilacqua L, Mah DY, Bezzerides V, Triedman JK, Walsh EP, Abrams DJ. Cardiac Events During Competitive, Recreational, and Daily Activities in Children and Adolescents With Long QT Syndrome. J Am Heart Assoc. 2017 Sep 21; 6(9). View abstract
  3. Chandler SF, Fynn-Thompson F, Mah DY. Role of cardiac pacing in congenital complete heart block. Expert Rev Cardiovasc Ther. 2017 Nov; 15(11):853-861. View abstract
  4. DeWitt E, Callahan R, Blume E, Marshall A, Mah D. Trans-Fontan baffle placement of an endocardial systemic ventricular pacing lead. HeartRhythm Case Rep. 2017 Feb; 3(2):129-132. View abstract
  5. Mah DY, Shakti D, Gauvreau K, Colan SD, Alexander ME, Abrams DJ, Brown DW. Relation of Left Atrial Size to Atrial Fibrillation in Patients Aged =22 Years. Am J Cardiol. 2017 Jan 01; 119(1):52-56. View abstract
  6. O'Leary E, Alexander ME, Fynn-Thompson F, Mah D. Transvenous approach to pacemaker lead implantation for sinus node dysfunction after extracardiac lateral tunnel Fontan conduit placement. HeartRhythm Case Rep. 2016 Nov; 2(6):495-498. View abstract
  7. Behar J, Zhu T, Oster J, Niksch A, Mah DY, Chun T, Greenberg J, Tanner C, Harrop J, Sameni R, Ward J, Wolfberg AJ, Clifford GD. Evaluation of the fetal QT interval using non-invasive fetal ECG technology. Physiol Meas. 2016 Sep; 37(9):1392-403. View abstract
  8. Mah DY, Cheng H, Alexander ME, Sleeper L, Newburger JW, Del Nido PJ, Thiagarajan RR, Rajagopal SK. Heart block following stage 1 palliation of hypoplastic left heart syndrome. J Thorac Cardiovasc Surg. 2016 Jul; 152(1):189-94. View abstract
  9. Hofferberth SC, Alexander ME, Mah DY, Bautista-Hernandez V, del Nido PJ, Fynn-Thompson F. Impact of pacing on systemic ventricular function in L-transposition of the great arteries. J Thorac Cardiovasc Surg. 2016 Jan; 151(1):131-8. View abstract
  10. Correa R, Sherwin ED, Kovach J, Mah DY, Alexander ME, Cecchin F, Walsh EP, Triedman JK, Abrams DJ. Mechanism and ablation of arrhythmia following total cavopulmonary connection. Circ Arrhythm Electrophysiol. 2015 Apr; 8(2):318-25. View abstract
  11. DeWitt ES, Triedman JK, Cecchin F, Mah DY, Abrams DJ, Walsh EP, Gauvreau K, Alexander ME. Time dependence of risks and benefits in pediatric primary prevention implantable cardioverter-defibrillator therapy. Circ Arrhythm Electrophysiol. 2014 Dec; 7(6):1057-63. View abstract
  12. Escobar-Diaz MC, Tworetzky W, Friedman K, Lafranchi T, Fynn-Thompson F, Alexander ME, Mah DY. Perinatal outcome in fetuses with heterotaxy syndrome and atrioventricular block or bradycardia. Pediatr Cardiol. 2014 Aug; 35(6):906-13. View abstract
  13. Shivapour JK, Sherwin ED, Alexander ME, Cecchin F, Mah DY, Triedman JK, Marx GR, del Nido PJ, Walsh EP. Utility of preoperative electrophysiologic studies in patients with Ebstein's anomaly undergoing the Cone procedure. Heart Rhythm. 2014 Feb; 11(2):182-6. View abstract
  14. Mah DY, Porras D, Bergersen L, Marshall AC, Walsh EP, Triedman JK. Incidence of and risk factors for catheterization-induced complete heart block in the pediatric cardiac catheterization laboratory. Circ Arrhythm Electrophysiol. 2014 Feb; 7(1):127-33. View abstract
  15. Miyake CY, Teele SA, Chen L, Motonaga KS, Dubin AM, Balasubramanian S, Balise RR, Rosenthal DN, Alexander ME, Walsh EP, Mah DY. In-hospital arrhythmia development and outcomes in pediatric patients with acute myocarditis. Am J Cardiol. 2014 Feb 01; 113(3):535-40. View abstract
  16. Correa R, Walsh EP, Alexander ME, Mah DY, Cecchin F, Abrams DJ, Triedman JK. Transbaffle mapping and ablation for atrial tachycardias after mustard, senning, or Fontan operations. J Am Heart Assoc. 2013 Sep 19; 2(5):e000325. View abstract
  17. Mah DY, Alexander ME, Banka P, Abrams DJ, Triedman JK, Walsh EP, Fynn-Thompson F, Mayer JE, Cecchin F. The role of cardiac resynchronization therapy for arterial switch operations complicated by complete heart block. Ann Thorac Surg. 2013 Sep; 96(3):904-9. View abstract
  18. Mah DY, Miyake CY, Sherwin ED, Walsh A, Anderson MJ, Western K, Abrams DJ, Alexander ME, Cecchin F, Walsh EP, Triedman JK. The use of an integrated electroanatomic mapping system and intracardiac echocardiography to reduce radiation exposure in children and young adults undergoing ablation of supraventricular tachycardia. Europace. 2014 Feb; 16(2):277-83. View abstract
  19. Mah DY, Sherwin ED, Alexander ME, Cecchin F, Abrams DJ, Walsh EP, Triedman JK. The electrophysiological characteristics of accessory pathways in pediatric patients with intermittent preexcitation. Pacing Clin Electrophysiol. 2013 Sep; 36(9):1117-22. View abstract
  20. Czosek RJ, Bonney WJ, Cassedy A, Mah DY, Tanel RE, Imundo JR, Singh AK, Cohen MI, Miyake CY, Fawley K, Marino BS. Impact of cardiac devices on the quality of life in pediatric patients. Circ Arrhythm Electrophysiol. 2012 Dec; 5(6):1064-72. View abstract
  21. Mah D, Wang A, Wu A, Alexander ME, Walsh EP. Marked QT prolongation and ventricular tachycardia of a transient nature in young children with cardiomyopathy. Pacing Clin Electrophysiol. 2012 Aug; 35(8):e247-50. View abstract
  22. Mah DY, Alexander ME, Cecchin F, Walsh EP, Triedman JK. The electroanatomic mechanisms of atrial tachycardia in patients with tetralogy of Fallot and double outlet right ventricle. J Cardiovasc Electrophysiol. 2011 Sep; 22(9):1013-7. View abstract
  23. Miyake CY, Mah DY, Atallah J, Oikle HP, Melgar ML, Alexander ME, Berul CI, Cecchin F, Walsh EP, Triedman JK. Nonfluoroscopic imaging systems reduce radiation exposure in children undergoing ablation of supraventricular tachycardia. Heart Rhythm. 2011 Apr; 8(4):519-25. View abstract
  24. Mah D, Triedman JK. The risk of ionizing radiation in electrophysiology studies and ablations. Pacing Clin Electrophysiol. 2011 Mar; 34(3):261-3. View abstract
  25. Mah D, Miyake C, Clegg R, Collins KK, Cecchin F, Triedman JK, Mayer J, Walsh EP. Epicardial left atrial appendage and biatrial appendage accessory pathways. Heart Rhythm. 2010 Dec; 7(12):1740-5. View abstract
  26. Kuo HC, Mah D, Chuang KS, Wu A, Hong L, Yaparpalvi R, Spierer M, Kalnicki S. A method incorporating 4DCT data for evaluating the dosimetric effects of respiratory motion in single-arc IMAT. Phys Med Biol. 2010 Jun 21; 55(12):3479-97. View abstract
  27. Mah D, Singh TP, Thiagarajan RR, Gauvreau K, Piercey GE, Blume ED, Fynn-Thompson F, Almond CS. Incidence and risk factors for mortality in infants awaiting heart transplantation in the USA. J Heart Lung Transplant. 2009 Dec; 28(12):1292-8. View abstract
  28. Mah VK, Zamakhshary M, Mah DY, Cameron B, Bass J, Bohn D, Scott L, Himidan S, Walker M, Kim PC. Absolute vs relative improvements in congenital diaphragmatic hernia survival: what happened to "hidden mortality". J Pediatr Surg. 2009 May; 44(5):877-82. View abstract
  29. Zamakhshary M, Mah K, Mah D, Cameron B, Bohn D, Bass J, Scott L, Kim PC. Physiologic predictors for the need for patch closure in neonatal congenital diaphragmatic hernia. Pediatr Surg Int. 2008 Jun; 24(6):667-70. View abstract
  30. Mah D, Wales P, Njere I, Kortan P, Masiakos P, Kim PC. Management of suspected common bile duct stones in children: role of selective intraoperative cholangiogram and endoscopic retrograde cholangiopancreatography. J Pediatr Surg. 2004 Jun; 39(6):808-12; discussion 808-12. View abstract