Professor Walsh is a cardiologist with an interest in electrophysiology and inherited cardiac conditions. He trained in cardiology in Toronto and did his electrophysiology training in Cincinnati. After spending 6 years as a consultant in Bristol, Mark is now based in Dublin.

In addition to his post at CHI Crumlin and the Mater Hospital, Professor Walsh is also available in Blackrock Clinic on a regular basis to see patients for all types of ablations. Given his interest in sport, he am also interested in screening athletes for any conditions that may predispose to sudden arrhythmic death syndrome. In his personal time, Professor Walsh has a keen interest in tennis, rugby and mountain biking.


MB, BCh, BAO 1999
National University of Ireland, Dublin
MRCPI 2003
Royal College of Physicians of Ireland
MRCPCH (Lon), ECFMG 2004


Heart Rhythm Society
American Heart Association

We are very pleased that he has treated our son successfully. He was caring, kind and very professional. My son can live his life without medication. What a gift. Thank you.
Fantastic, very helpful, compassionate and went above and beyond care. Making us feel important and at ease. Thank you for everything.
We are very pleased with the treatment we received. Very attentive and supportive. Thank you!

Very kind and explained everything engaged with my daughter clearly, very friendly.

Professional, considerate service. Provides real confidence that you’re in good hands.


Respectfulness 100%
Clarity of Consultation 100%
Attentiveness 100%
Patient Interest 100%
Interpersonal Skills 100%
Patient Understanding 100%

* Results from the GMC revalidation process.


● Ablation of cardiac arrhythmias
● Congenital cardiology / ablations
● Atrial fibrillation
● Wolff-Parkinson-White Syndrome
● Pacemakers, Pacemaker Lead Extraction
● Sudden Arrhythmic Death Syndrome
● Inherited Cardiac Conditions
● Evaluation of Syncope
● Postural Orthostatic Tachycardia Syndrome (POTS)


Catheter ablation, inherited cardiac conditions.

Outcomes From Pediatric Ablation: A Review of 20 Years of National Data.
Walsh MA, Gonzalez CM, Uzun OJ, McMahon CJ, Sadagopan SN, Yue AM, Seller N, Hares DL, Bhole V, Till J, Wong L, Mangat JS, Lowe MD, Rosenthal E, Bowes M, Stuart AG.
JACC Clinical Electrophysiology. 2021 Jun 22

International Triadin Knockout Syndrome Registry.
Clemens DJ, Tester DJ, Giudicessi JR, Bos JM, Rohatgi RK, Abrams DJ, Balaji S, Crotti L, Faure J, Napolitano C, Priori SG, Probst V, Rooryck-Thambo C, Roux-Buisson N, Sacher F, Schwartz PJ, Silka MJ, Walsh MA, Ackerman MJ.
Circulation Genomics. 2019 Feb

Ventricular fibromas in children, arrhythmia risk, and outcomes: A multicenter study.
Jones JP, Ramcharan T, Chaudhari M, Bhole V, Mcleod K, Sadagopan S, Uzun O, Parry A, Till J, McMahon CJ, Stuart AG, Walsh MA.
Heart Rhythm. 2018 Oct;15(10):1507-1512

A multicentre study of patients with Timothy syndrome.
Walsh MA, Turner C, Timothy KW, Seller N, Hares DL, James AF, Hancox JC, Uzun O, Boyce D, Stuart AG, Brennan P, Sarton C, McGuire K, Newbury-Ecob RA, Mcleod K.
Europace. 2018 Feb 1;20(2):377-385.

Compound Heterozygous Triadin Mutation Causing Cardiac Arrest in Two Siblings.
Walsh MA, Stuart AG, Schlecht H, James AF, Hancox JC, Newbury-Ecob RA.
Pacing Clinical Electrophysiology, 2016 Jan 14

Extraction of SelectSecure leads compared to conventional pacing leads in patients with congenital heart disease and congenital atrioventricular block.
Shepherd E, Stuart G, Martin R, Walsh MA.
Heart Rhythm. 2015 Jun;12(6):1227-32

Cumulative Radiation Exosure in Pediatric Patients with Congenital Heart Disease. Walsh MA, Noga M, Rutledge J.
Pediatric Cardiology 2014 Aug 15

Implantation of the new Medtronic LINQ™ loop recorder in an infant with ventricular tachycardia.
Hutchinson LJ, Stuart G, Walsh MA.
Cardiology Young. 2014 Oct 24:1-3

Interrupted aortic arch with retrograde subclavian perfusion.
Kang SL, Forsey J, Walsh MA
Acta Cardiology 2014 Jun;69(3):328-30

Conduction Abnormalities in Pediatric Patients with Restrictive Cardiomyopathy
Mark A. Walsh, MD., John L. Jefferies M.D., Jeff A. Towbin, M.D, Richard J. Czosek, M.D.
Circulation / Heart Failure 2012 Mar 1; 5(2):267-73

Successful Treatment of Pallid Breath-Holding Spells with Fluoxetine
Mark Walsh, M.D., Timothy K. Knilans, M.D., Jeffrey B. Anderson, M.D., Richard J. Czosek, M.D.
Pediatrics 2012 Sep; 130 (3)

Airway Pressure Release Ventilation Improves Pulmonary Blood Flow in Infants following Cardiac Surgery
Mark A. Walsh, MD, Michele Merat, Gustavo La Rott, Pretha Joshi, Vinay Joshi, MD, Tuyen Tran, Steve Jarvis, Christopher A. Caldarone, Glen S. Van Arsdell, Andrew Redington, and Brian Kavanagh.
Critical Care Medicine 2011 Dec;39(12):2599-604

Ventricular Oversensing in a Biventricular Pacemaker
Mark A. Walsh, MD., Jeffery B. Anderson, M.D., Timothy K. Knilans, M.D., Carol M. Cottrill, M.D., Richard J. Czosek, M.D.
PACE 2012 Jan 13.

Critical Care Outcomes in Pulmonary Atresia and Intact Ventricular Septum Undergoing Single Ventricle Palliation
Walsh, Mark A, Asoh, Kentaro, Van Arsdell, Glen S, Humpl, Tilman
Cardiol Young. 2010 Jun;20(3):290-6

Percutaneous pulmonary valve implantation within bioprosthetic valves
Kentaro Asoh, Mark Walsh, Edward Hickey, Mohamed Nagiub, Rajiv Chaturvedi, Kyong-Jin Lee, Lee Benson

Eur Heart J. 2010 Jun;31(11):1404-9

Left Ventricular Morphology effects Mortality following the Norwood Operation
M. A. Walsh; Christopher Caldarone; Anne Dipchand; Brian McCrindle; Glen S. Van Arsdell; S. Schwartz
Heart. 2009 Aug;95(15):1238-44. Epub 2009 May 19.

Kaposiform hemangioendothelioma presenting antenatally with a pericardial effusion.
Walsh MA, Carcao M, Pope E, Lee KJ.
Journal of Pediatric Hematology and Oncology – 2008 Oct; 30(10):761-3

Anomalous left coronary artery: A critical problem in infancy
M. A. Walsh; D. M. Coleman; D. Duff; P. Oslizlok; K.P. Walsh; M. Redmond; AE. Woods
Irish Journal of Medical Science – Irish Journal of Medical Science 2008 Apr 8

A Tbx5-dependent pathway regulating diastolic function in congenital heart disease
Yonghong Zhu, Anthony O. Gramolini, Mark A. Walsh, Yu-Qing Zhou, Cameron Slorach, Mark Freidberg, Jun K. Takeuchi, Hui Sun, R. Mark Henkelman, Peter H. Backx, Andrew N. Redington, David H. MacLennan, and Benoit G. Bruneau
Proceedings of the National Academy of Sciences: 2008 Apr 8;105(14):5519-24.

Surgical Repair of the Mitral Valve in Children with Dilated Cardiomyopathy and Mitral Regurgitation
Mark Walsh, Lee Benson, Anne Dipchand, Andrew Redington, Christopher A. Caldarone, Glen S. Van Arsdell, Paul Kantor
Annals of Thoracic Surgery 2008 Jun;85(6):2085-8.

Comprehensive Aristotle score significantly correlates with total cardiac output during the early postoperative period following the Norwood procedur
Jia Li MD PhD, Glen S. Van Arsdell MD, Gencheng Zhang MD PhD, Helen Holtby MD, Mark Walsh MD, Christopher A. Caldarone MD, Andrew N. Redington MD
2008 Jul;136(1):123-8. 2008 May 7.

Occlusion of a residual Sano shunt with the Amplatzer PDA device
M. A. Walsh; C. McMahon; K.P. Walsh
Journal of Invasive Cardiology – 2008 Feb;20(2):E64-5

Radiofrequency Perforation of the Right Ventricular Outflow Tract as a Palliative Procedure in Pulmonary atresia with Ventricular Septal Defect
M. A. Walsh; R. Chaturvedi; Kyong Jin-Lee; Glen Van Arsdell; L. N. Benson
Catheterization and Cardiovascular Interventions: 2007;69(7):1015

Percutaneous Closure of Postoperative Ventricular Septal Defects with the Amplatzer Device
M. A. Walsh; D. M. Coleman; P. Oslizlok; K.P. Walsh
Catheterization and Cardiovascular Interventions – 2006 Feb17;67(3): 445 – 451

Atrioventricular block following transcatheter closure of perimembranous septal defects
M. A. Walsh; J. Bialkowski; M. Szkutnik; M. Pawelec-Wojtalik; W. Bobkowski; K. P. Walsh
Heart. 2006 : Sept 92 (9) 1295-97

Screening for Patent Ductus Arteriosus in 24-30 week infants
M. A. Walsh; A. Twomey; W. Gorman; J. Murphy
Irish Medical journal – 2006 – September 99 (8)