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

MEDICAL SERVICES

Specialties

Departments

Programs

Languages

  • English

EDUCATION

Undergraduate Degree

  • Queen's University , 2001 , Kingston , Ontario, Canada

Medical School

  • McMaster Medical School , 2004 , Hamilton, Otario , Canada

Internship

  • Johns Hopkins Hospital , 2005 , Baltimore , MD

Residency

  • Johns Hopkins Hospital , 2007 , Baltimore , MD

Fellowship

Pediatric Cardiology
  • Boston Children's Hospital , 2010 , Boston , MA

Fellowship

Senior, Electrophysiology
  • Boston Children's Hospital , 2011 , Boston , MA

Philosophy of Care

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.

CERTIFICATIONS

  • American Board of Pediatrics, General Pediatrics
  • American Board of Pediatrics, Pediatric Cardiology

PUBLICATIONS

Publications powered by Harvard Catalyst Profiles

  1. Dionne A, Gauvreau K, O'Leary E, Mah DY, Abrams DJ, Alexander ME, DeWitt ES, Bezzerides VJ, Triedman JK, Walsh EP. Risk Factors for Early Recurrence following Ablation for Accessory Pathways: The Role of Consolidation Lesions. Circ Arrhythm Electrophysiol. 2020 Oct 05. View abstract
  2. Joyce J, O'Leary ET, Mah DY, Harrild DM, Rhodes J. Cardiac resynchronization therapy improves the ventricular function of patients with Fontan physiology. Am Heart J. 2020 Oct 02. View abstract
  3. Dionne A, Mah DY, Son MBF, Lee PY, Henderson L, Baker AL, de Ferranti SD, Fulton DR, Newburger JW, Friedman KG. Atrio-Ventricular Block in Children With Multisystem Inflammatory Syndrome. Pediatrics. 2020 Aug 27. View abstract
  4. Assaad IE, Hood-Pishchany MI, Kheir J, Mistry K, Dixit A, Halyabar O, Mah DY, Meyer-Macaulay C, Cheng H. WITHDRAWN: Complete Heart Block, Severe Ventricular Dysfunction and Myocardial Inflammation in a Child with COVID-19 Infection. JACC Case Rep. 2020 May 27. View abstract
  5. El-Assaad I, Hood-Pishchany MI, Kheir J, Mistry K, Dixit A, Halyabar O, Mah DY, Meyer-Macaulay C, Cheng H. Complete Heart Block, Severe Ventricular Dysfunction, and Myocardial Inflammation in a Child With COVID-19 Infection. JACC Case Rep. 2020 Jul 15; 2(9):1351-1355. View abstract
  6. Hylind RJ, Chandler SF, Beausejour Ladouceur V, Jamal SM, Alexander ME, Mah DY, Phaneuf EA, DeWitt ES, Bezzerides VJ, Abrams DJ. Clinical and Genetic Findings in Children Presenting With Ventricular Fibrillation as the First Manifestation of Cardiovascular Disease. J Am Heart Assoc. 2020 May 18; 9(10):e016322. View abstract
  7. Dionne A, Kheir JN, Gauvreau K, Triedman JK, Abrams DJ, Alexander ME, DeWitt ES, Mah DY, Walsh EP, Bezzerides VJ. Value of provocative electrophysiology testing in the management of pediatric patients after congenital heart surgery. Pacing Clin Electrophysiol. 2020 Apr 24. View abstract
  8. O'Leary ET, Alexander ME, Bezzerides VJ, Drogosz M, Economy KE, Friedman KG, Pickard SS, Tworetzky W, Mah DY. Low mortality in fetal supraventricular tachycardia: Outcomes in a 30-year single-institution experience. J Cardiovasc Electrophysiol. 2020 May; 31(5):1105-1113. View abstract
  9. Chandler SF, Chu E, Whitehill RD, Bevilacqua LM, Bezzerides VJ, DeWitt ES, Alexander ME, Abrams DJ, Triedman JK, Walsh EP, Mah DY. Adverse event rate during inpatient sotalol initiation for the management of supraventricular and ventricular tachycardia in the pediatric and young adult population. Heart Rhythm. 2020 Jun; 17(6):984-990. View abstract
  10. Chandler SF, Whitehill RD, DeWitt ES, Alexander ME, Thompson FF, Mah DY. Ultra-rapid atrial pacing as a form of rate control in postoperative automatic arrhythmias in patients with congenital heart disease. HeartRhythm Case Rep. 2020 Apr; 6(4):215-218. View abstract
  11. Kovach JR, Mah DY, Abrams DJ, Alexander ME, Cecchin F, Triedman JK, Walsh EP. Outcomes of catheter ablation of anteroseptal and midseptal accessory pathways in pediatric patients. Heart Rhythm. 2020 May; 17(5 Pt A):759-767. View abstract
  12. Pham TDN, Valente AM, Mayer JE, DeWitt ES, Mah DY. Implanted pacemaker and cardioverter-defibrillator in a patient with ectopia cordis. HeartRhythm Case Rep. 2020 Feb; 6(2):110-113. View abstract
  13. Price J, Mah DY, Fynn-Thompson FL, Tsirka AE. Successful bilateral thoracoscopic sympathectomy for recurrent ventricular arrhythmia in a pediatric patient with hypertrophic cardiomyopathy. HeartRhythm Case Rep. 2020 Jan; 6(1):23-26. View abstract
  14. Goldsmith MP, Allan CK, Callahan R, Kaza AK, Mah DY, Salvin JW, Gauvreau K, Porras D. Acute coronary artery obstruction following surgical repair of congenital heart disease. J Thorac Cardiovasc Surg. 2020 05; 159(5):1957-1965.e1. View abstract
  15. O'Leary ET, Dewitt ES, Mah DY, Gauvreau K, Walsh EP, Bezzerides VJ. Differentiation of fasciculoventricular fibers from anteroseptal accessory pathways using the surface electrocardiogram. Heart Rhythm. 2019 07; 16(7):1072-1079. View abstract
  16. Bezzerides VJ, Walsh A, Martuscello M, Escudero CA, Gauvreau K, Lam G, Abrams DJ, Triedman JK, Alexander ME, Bevilacqua L, Mah DY. The Real-World Utility of the LINQ Implantable Loop Recorder in Pediatric and Adult Congenital Heart Patients. JACC Clin Electrophysiol. 2019 02; 5(2):245-251. View abstract
  17. Escudero CA, Mah DY, Miyake CY, Stephenson EA, LaPage MJ, Kubuš P, I Cohen M, Atallah J. Riata lead failure in pediatric and congenital heart disease patients. J Cardiovasc Electrophysiol. 2019 03; 30(3):320-325. View abstract
  18. Zaleski KL, Scholl RL, Thiagarajan RR, Porras D, Mah D, DiNardo JA, Nasr VG. Elective Extracorporeal Membrane Oxygenation Support for High-Risk Pediatric Cardiac Catheterization. J Cardiothorac Vasc Anesth. 2019 Jul; 33(7):1932-1938. View abstract
  19. O'Leary ET, Gauvreau K, Alexander ME, Banka P, Bezzerides VJ, Fynn-Thompson F, Triedman JK, Walsh EP, Mah DY. Dual-Site Ventricular Pacing in Patients With Fontan Physiology and Heart Block: Does it Mitigate the Detrimental Effects of Single-Site Ventricular Pacing? JACC Clin Electrophysiol. 2018 10; 4(10):1289-1297. View abstract
  20. Mah DY, Prakash A, Porras D, Fynn-Thompson F, DeWitt ES, Banka P. Coronary artery compression from epicardial leads: More common than we think. Heart Rhythm. 2018 10; 15(10):1439-1447. View abstract
  21. Merlocco A, Brown DW, Gauvreau K, Mah DY, Triedman JK, Alexander ME, Walsh EP. Evaluation of left ventricular false tendons in children with idiopathic left ventricular tachycardia. Pacing Clin Electrophysiol. 2018 09; 41(9):1143-1149. View abstract
  22. Mah DY, Sleeper LA, Crosson JE, Czosek RJ, Love BA, McCrindle BW, Muiño-Mosquera L, Olson AK, Pilcher TA, Tierney ESS, Shah MJ, Wechsler SB, Young LT, Lacro RV. Frequency of Ventricular Arrhythmias and Other Rhythm Abnormalities in Children and Young Adults With the Marfan Syndrome. Am J Cardiol. 2018 10 15; 122(8):1429-1436. View abstract
  23. 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 May; 13(3):419-427. View abstract
  24. 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
  25. 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
  26. Hill KD, Frush DP, Han BK, Abbott BG, Armstrong AK, DeKemp RA, Glatz AC, Greenberg SB, Herbert AS, Justino H, Mah D, Mahesh M, Rigsby CK, Slesnick TC, Strauss KJ, Trattner S, Viswanathan MN, Einstein AJ. Radiation Safety in Children With Congenital and Acquired Heart Disease: A Scientific Position Statement on Multimodality Dose Optimization From the Image Gently Alliance. JACC Cardiovasc Imaging. 2017 07; 10(7):797-818. View abstract
  27. Hu D, Li Y, Zhang J, Pfeiffer R, Gollob MH, Healey J, Harrell DT, Makita N, Abe H, Sun Y, Guo J, Zhang L, Yan G, Mah D, Walsh EP, Leopold HB, Giustetto C, Gaita F, Zienciuk-Krajka A, Mazzanti A, Priori SG, Antzelevitch C, Barajas-Martinez H. The Phenotypic Spectrum of a Mutation Hotspot Responsible for the Short QT Syndrome. JACC Clin Electrophysiol. 2017 07; 3(7):727-743. View abstract
  28. 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
  29. 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
  30. 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
  31. 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 09; 37(9):1392-403. View abstract
  32. 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
  33. 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
  34. 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
  35. 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
  36. 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
  37. 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
  38. 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
  39. 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
  40. 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
  41. 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
  42. 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
  43. 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
  44. 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
  45. 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
  46. 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
  47. 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
  48. 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
  49. 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
  50. 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
  51. 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
  52. 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
  53. 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
  54. 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
  55. MacDonald IM, Mah DY, Ho YK, Lewis RA, Seabra MC. A practical diagnostic test for choroideremia. Ophthalmology. 1998 Sep; 105(9):1637-40. View abstract