Colin McMahon

Colin McMahon

Paediatric Cardiologist and Clinical Professor

Professor Colin McMahon is a board certified Paediatric Cardiologist with over 10 years’ experience as a consultant. He trained in London, Houston, and Boston before returning to Ireland in 2005. His core competencies include non-invasive imaging, echocardiography, MRI, foetal imaging, cardiomyopathy and transplant. He is a Clinical Professor in University College Dublin. He was awarded FRCPI, FRCPCH, FASE, FAAP, FACC and FAHA. He has authored over 10 chapters, and 100 peer reviewed publications including articles in Circulation, JACC, Journal of Heart Lung Transplant and the American Journal of Cardiology. He is a passionate teacher and has won teaching awards. From a research standpoint his interests include application of 3D printing to congenital heart disease, non-invasive imaging assessment of cardiomyopathy, antiplatelet function in congenital heart defects, and clinical research in congenital heart disease. His main passion is encouraging academic development of trainees and being an effective mentor and coach.

Colin McMahon

Paediatric Cardiologist and Clinical Professor

Shane McHugo
Position: PhD Student

Shane’s primary area of interest is the application of 3D printing to children with congenital heart defects, and the development of bespoke phantoms in patients with univentricular circulation.

Irene Regan
Position: Clinical Research Fellow

Irene is the Chief Medical Scientist in the coagulation department in Our Lady’s Hospital for Sick Children, Crumlin. Irene is interested in studying antiplatelet function in children with different forms of congenital heart disease.  

Application of 3D printing to congenital heart disease in univentricular circulation

Dr McMahon is working on this project with Shane McHugo, Liam Morris, and Lars Nolke

Antiplatelet efficacy of aspirin in children with congenital heart disease

Dr McMahon is working on this project with Irene Regan, Lars Nolke and Beatrice Nolan

Development of transcatheter treatment for tetralogy of Fallot

Dr McMahon is working on this project with Kevin Walsh, Damien Kenny, Eoin O’Cearbhaill

The list of publications below is automatically derived from MEDLINE/PubMed. As a result, there may be incorrect or missing publications.

McHugo S, Nolke L, Delassus P, MacCarthy E, Morris L, McMahon CJ, 2020 Sep 2, An in-vitro evaluation of the flow haemodynamic performance of Gore-Tex extracardiac conduits for univentricular circulation. J Cardiothorac Surg, DOI: 10.1186/s13019-020-01269-x
Cleary A, McMahon CJ, 2020 Jul, Literature review of international mammalian target of rapamycin inhibitor use in the non-surgical management of haemodynamically significant cardiac rhabdomyomas. Cardiol Young, DOI: 10.1017/S104795112000147X
Tretter JT, Windram J, Faulkner T, Hudgens M, Sendzikaite S, Blom NA, Hanseus K, Loomba RS, McMahon CJ, Zheleva B, Kumar RK, Jacobs JP, Oechslin EN, Webb GD, Redington AN, 2020 Apr, Heart University: a new online educational forum in paediatric and adult congenital cardiac care. The future of virtual learning in a post-pandemic world? Cardiol Young, DOI: 10.1017/S1047951120000852
Duignan S, Walsh KP, McMahon CJ, 2020 Mar, Decision-Making in the Catheter Laboratory: The Most Important Variable in Successful Outcomes. Pediatr Cardiol, DOI: 10.1007/s00246-020-02295-1
Lynch Á, Ng L, Lawlor P, Lavelle M, Gardner F, Breatnach C, McMahon CJ, Franklin O, 2019 Dec 16, Cyanotic Congenital Heart Disease Modes of Presentation and Prenatal Detection Ir Med J, DOI: 10.1007/s00246-020-02295-1
Duignan S, Doyle SL, McMahon CJ, 2019, Refractory Kawasaki disease: diagnostic and management challenges. Pediatric Health Med Ther, DOI: 10.2147/PHMT.S165935
McMahon CJ, Ayoubi K, Mehanna R, Phelan E, O'Cearbhaill E, Russell J, Nölke L, 2020 Jan, Outcome of congenital tracheal stenosis in children over two decades in a national cardiothoracic surgical unit. Cardiol Young, DOI: 10.1017/S1047951119002725
McCrossan B, Nolke L, Kenny D, Oslizlok P, Crispino G, Walsh KP, McMahon CJ, 2019 Sep, Experience of stent implantation for recurrent aortic arch obstruction following Norwood or Damus-Kaye-Stansel operation over the last decade. Cardiol Young, DOI: 10.1017/S1047951119001549
Breatnach CR, Nolke L, McMahon CJ, 2019 Jun, Retroaortic innominate vein in a patient with transposition of the great arteries: the surgical implications. Cardiol Young, DOI: 10.1017/S1047951119000763
Breatnach CR, Aggarwal V, Al-Alawi K, McMahon CJ, Franklin O, Prendiville T, Oslizlok P, Walsh K, Qureshi AM, Kenny D, 2019 Jun 1, Percutaneous axillary artery approach for ductal stenting in critical right ventricular outflow tract lesions in the neonatal period. Catheter Cardiovasc Interv, DOI: 10.1002/ccd.28302
Vigano G, McMahon CJ, Walsh K, Oslizlok P, Franklin O, Nolke L, Redmond JM, Byrne J, McGuinness JG, 2019 Oct 1, High-risk Fontan completion patients achieve low perioperative risk and benefit from cavopulmonary connection 7 years out†. Eur J Cardiothorac Surg, DOI: 10.1093/ejcts/ezz069
Duignan S, Ryan A, Burns B, Kenny D, McMahon CJ, 2018 Oct, Complex Decision Making in the Pediatric Catheterization Laboratory: Catheterizer, Know Thyself and the Data. Pediatr Cardiol, DOI: 10.1007/s00246-018-1949-x
Shine AM, Finn DG, Allen N, McMahon CJ, 2019 Feb, Correction to: Transition from tube feeding to oral feeding: experience in a tertiary care paediatric cardiology unit. Ir J Med Sci, DOI: 10.1007/s11845-018-1841-y
Jones JP, Ramcharan T, Chaudhari M, Bhole V, Mcleod K, Sadagopan S, Uzun O, Parry A, Till J, McMahon CJ, Stuart AG, Walsh MA, 2018 Oct, Ventricular fibromas in children, arrhythmia risk, and outcomes: A multicenter study. Heart Rhythm, DOI: 10.1016/j.hrthm.2018.06.018
Smyth AE, Kaleviste E, Snow A, Kisand K, McMahon CJ, Cant AJ, Leahy TR, 2018 May, Aortic Calcification in a Patient with a Gain-of-Function STAT1 Mutation. J Clin Immunol, DOI: 10.1007/s10875-018-0513-z
Duignan S, Ryan A, O'Keeffe D, Kenny D, McMahon CJ, 2018 Oct, Prospective Analysis of Decision Making During Joint Cardiology Cardiothoracic Conference in Treatment of 107 Consecutive Children with Congenital Heart Disease. Pediatr Cardiol, DOI: 10.1007/s00246-018-1899-3
Shine AM, Finn DG, Allen N, McMahon CJ, 2019 Feb, Transition from tube feeding to oral feeding: experience in a tertiary care paediatric cardiology unit. Ir J Med Sci, DOI: 10.1007/s11845-018-1812-3
Morrison ML, McMahon C, Tully R, Enright N, Pignatelli R, Towbin JA, McMahon CJ, 2018 May, Prevalence of left ventricular hypertrabeculation/noncompaction among children with sickle cell disease. Congenit Heart Dis, DOI: 10.1111/chd.12592
Finn D, Walsh K, Roberson D, McMahon CJ, 2018 Feb, Myocardial Fistulisation and Coronary Arterial Ectasia in Children with Univentricular Circulation: An Under-Recognised Problem. Pediatr Cardiol, DOI: 10.1007/s00246-017-1749-8
Ryan A, Duignan S, Kenny D, McMahon CJ, 2018 Jan, Decision Making in Paediatric Cardiology. Are We Prone to Heuristics, Biases and Traps? Pediatr Cardiol, DOI: 10.1007/s00246-017-1742-2
Breatnach CR, Cleary A, Prendiville T, Crumlish K, Murchan H, McMahon CJ, 2018 Jan, Prevalence of Subclinical Enteric Alpha-1-Antitrypsin Loss in Children with Univentricular Circulation Following Total Cavopulmonary Connection. Pediatr Cardiol, DOI: 10.1007/s00246-017-1720-8
Kindel SJ, Hsu HH, Hussain T, Johnson JN, McMahon CJ, Kutty S, 2017 Sep, Multimodality Noninvasive Imaging in the Monitoring of Pediatric Heart Transplantation. J Am Soc Echocardiogr, DOI: 10.1016/j.echo.2017.06.003
Glackin S, Mayne P, Kenny D, McMahon CJ, Cody D, 2017 Mar 10, Dilated cardiomyopathy secondary to vitamin D deficiency and hypocalcaemia in the Irish paediatric population: A case report. Ir Med J, DOI: 10.1016/j.echo.2017.06.003
Johnston NF, Prendiville T, McMahon CJ, 2018 Feb, 3D printing of severe hypertrophic cardiomyopathy in a child with Rasopathy. Ir J Med Sci, DOI: 10.1007/s11845-017-1646-4
McGovern E, Kelleher E, Snow A, Walsh K, Gadallah B, Kutty S, Redmond JM, McMahon CJ, 2017 Sep, Clinical application of three-dimensional printing to the management of complex univentricular hearts with abnormal systemic or pulmonary venous drainage. Cardiol Young, DOI: 10.1017/S104795111600281X
McGovern E, Kelleher E, Potts JE, O'Brien J, Walsh K, Nolke L, McMahon CJ, 2016, Predictors of poor outcome among children with heterotaxy syndrome: a retrospective review. Open Heart, DOI: 10.1136/openhrt-2015-000328
Johnston N, Coleman D, McMahon CJ, 2017 Mar, Extensive coronary and systemic arterial aneurysm development in severe refractory Kawasaki disease. Cardiol Young, DOI: 10.1017/S1047951116001967
Johnston N, Snow A, McMahon CJ, 2016 Jul 8, Unexpected coronary arterial calcification and thrombosis late after Kawasaki disease. BMJ Case Rep, DOI: 10.1136/bcr-2016-216451
McGovern E, Morgan CT, Oslizlok P, Kenny D, Walsh KP, McMahon CJ, 2016 Oct, Transcatheter stenting of the right ventricular outflow tract augments pulmonary arterial growth in symptomatic infants with right ventricular outflow tract obstruction and hypercyanotic spells. Cardiol Young, DOI: 10.1017/S1047951115002231
McGovern E, McNally P, O'Sullivan M, Phelan E, Sumner K, Best DH, McMahon CJ, 2016 Apr, Infantile pulmonary capillary haemangiomatosis: a lethal form of pulmonary hypertension. Cardiol Young, DOI: 10.1017/S1047951115001006
Dhar R, Reardon W, McMahon CJ, 2015 Jun, Response to commentary: biventricular non-compaction hypertrophic cardiomyopathy in association with congenital complete heart block and type I mitochondrial complex deficiency. Cardiol Young, DOI: 10.1017/S1047951115000323
McMahon CJ, Breathnach C, Betts DR, Sharkey FH, Greally MT, 2015 May, De Novo interstitial deletion 13q33.3q34 in a male patient with double outlet right ventricle, microcephaly, dysmorphic craniofacial findings, and motor and developmental delay. Am J Med Genet A, DOI: 10.1002/ajmg.a.36978
Simmonds J, Murchan H, James A, Crispino G, O'Brien J, Crumlish K, Franklin O, Fenton M, Burch M, McMahon CJ, 2015 Jun, Outcome of shared care for pediatric cardiac transplantation between two nations with different health care systems. J Heart Lung Transplant, DOI: 10.1016/j.healun.2014.12.010
Mone F, Walsh C, Mulcahy C, McMahon CJ, Farrell S, MacTiernan A, Segurado R, Mahony R, Higgins S, Carroll S, McParland P, McAuliffe FM, 2015 Jun, Prenatal detection of structural cardiac defects and presence of associated anomalies: a retrospective observational study of 1262 fetal echocardiograms. Prenat Diagn, DOI: 10.1002/pd.4575
McGovern E, Ryan E, McMahon CJ, 2016 Jan, An infant with out-of-hospital cardiac arrest secondary to enteroviral myocarditis surviving up to cardiac transplantation. Cardiol Young, DOI: 10.1017/S1047951114002595
McCrossan BA, McMahon CJ, Walsh KP, 2016 Feb 1, First reported use of drug-eluting bioabsorbable vascular scaffold in congenital heart disease. Catheter Cardiovasc Interv, DOI: 10.1002/ccd.25768
Breathnach C, Pears J, Franklin O, Webb D, McMahon CJ, 2014 Oct, Rapid regression of left ventricular outflow tract rhabdomyoma after sirolimus therapy. Pediatrics, DOI: 10.1542/peds.2013-3293
McMahon CJ, Nolke L, 2014 Aug, Successful palliation of a child with left ventricular noncompaction cardiomyopathy and tricuspid atresia to Fontan procedure. Ann Thorac Surg, DOI: 10.1016/j.athoracsur.2013.09.110
Dhar R, Reardon W, McMahon CJ, 2015 Jun, Biventricular non-compaction hypertrophic cardiomyopathy in association with congenital complete heart block and type I mitochondrial complex deficiency. Cardiol Young, DOI: 10.1017/S1047951114001279
Walsh CA, MacTiernan A, Farrell S, Mulcahy C, McMahon CJ, Franklin O, Coleman D, Mahony R, Higgins S, Carroll S, McParland P, McAuliffe FM, 2014 Dec, Mode of delivery in pregnancies complicated by major fetal congenital heart disease: a retrospective cohort study. J Perinatol, DOI: 10.1038/jp.2014.104
Cleary A, Watson R, McMahon CJ, 2014 Sep, Successful treatment of refractory cutaneous warts using topical 3% cidofovir in a child after heart transplant. J Heart Lung Transplant, DOI: 10.1016/j.healun.2014.02.012
Kelleher EM, Nolke L, McMahon CJ, 2015 Mar, Successful slide tracheoplasty and partial atrioventricular septal defect repair following extracorporeal membrane oxygenation support. Cardiol Young, DOI: 10.1017/S1047951114000468
Kelleher E, McMahon C, McMahon CJ, 2015 Feb, A case of parvovirus B19-induced pure red cell aplasia in a child following heart transplant. Cardiol Young, DOI: 10.1017/S1047951114000225
McMahon CJ, Morgan CT, Greally MT, 2015 Jan, Chromosome 22q11.21 microduplication in association with hypoplastic left heart syndrome with hypoplastic pulmonary arteries. Cardiol Young, DOI: 10.1017/S104795111300231X
McMahon CJ, Coleman D, Oslizlok P, 2014 Nov 1, Extensive coronary arterial fistula development in patients with univentricular circulation. Catheter Cardiovasc Interv, DOI: 10.1002/ccd.25322
McMahon CJ, Morgan CT, Walsh KP, 2014 Jan 1, Transcatheter left ventricular outflow tract stent placement in a low birth weight child with hypoplastic left ventricle, mitral atresia, transposition of the great arteries, ventricular septal defect and severe pulmonary stenosis. Catheter Cardiovasc Interv, DOI: 10.1002/ccd.25119
McMahon CJ, Prendiville T, Nolke L, 2014 Feb, Pre-operative identification of an anomalous left coronary artery from the pulmonary artery in association with tetralogy of Fallot and an aortopulmonary window. Cardiol Young, DOI: 10.1017/S1047951113000255
McMahon CJ, Lambert I, Walsh KP, 2013 Oct 1, Transcatheter double stent implantation for treatment of middle aortic coarctation syndrome. Catheter Cardiovasc Interv, DOI: 10.1002/ccd.24857
McMahon CJ, Walsh KP, 2013 Dec 1, Transcatheter right ventricular outflow tract stent implantation in a child with pentalogy of Cantrell, double outlet right ventricle, and severe pulmonary stenosis. Catheter Cardiovasc Interv, DOI: 10.1002/ccd.24852
Shahdadpuri R, Prendiville T, Nölke L, McMahon CJ, 2009 Feb, Berry syndrome in association with familial limb malformation. Ir Med J, DOI: 10.1002/ccd.24852
O'Gorman CS, Tortoriello TA, McMahon CJ, 2009 May, Outcome of children with Pentalogy of Cantrell following cardiac surgery. Pediatr Cardiol, DOI: 10.1007/s00246-009-9410-9
Ganame J, Pignatelli RH, Eidem BW, Claus P, D'hooge J, McMahon CJ, Buyse G, Towbin JA, Ayres NA, Mertens L, 2008 Nov, Myocardial deformation abnormalities in pediatric hypertrophic cardiomyopathy: are all etiologies identical? Eur J Echocardiogr, DOI: 10.1093/ejechocard/jen150
Shahdadpuri R, Lynch SA, Murchan H, McMahon CJ, 2008 Jul, A novel constellation of cardiac findings for Kabuki syndrome: hypoplastic left heart syndrome and partial anomalous pulmonary venous drainage. Pediatr Cardiol, DOI: 10.1007/s00246-008-9197-0
Ganame J, Mertens L, Eidem BW, Claus P, D'hooge J, Havemann LM, McMahon CJ, Elayda MA, Vaughn WK, Towbin JA, Ayres NA, Pignatelli RH, 2007 Dec, Regional myocardial deformation in children with hypertrophic cardiomyopathy: morphological and clinical correlations. Eur Heart J, DOI: 10.1093/eurheartj/ehm444
Geva A, McMahon CJ, Gauvreau K, Mohammed L, del Nido PJ, Geva T, 2007 Oct 9, Risk factors for reoperation after repair of discrete subaortic stenosis in children. J Am Coll Cardiol, DOI: 10.1016/j.jacc.2007.07.013
Jefferies JL, Price JF, Denfield SW, Chang AC, Dreyer WJ, McMahon CJ, Grenier MA, Clunie SK, Thomas A, Moffett BS, Wann TS, Smith EO, Towbin JA, 2007 Sep, Safety and efficacy of nesiritide in pediatric heart failure. J Card Fail, DOI: 10.1016/j.cardfail.2007.04.005
McMahon CJ, Murchan H, Prendiville T, Burch M, 2007 Sep-Oct, Parvovirus B19 infection associated with dilated cardiomyopathy in patients with previous anthracycline exposure. Pediatr Cardiol, DOI: 10.1007/s00246-006-0147-4
McMahon CJ, Moniotte S, Powell AJ, del Nido PJ, Geva T, 2007 Jul 15, Usefulness of magnetic resonance imaging evaluation of congenital left ventricular aneurysms. Am J Cardiol, DOI: 10.1016/j.amjcard.2007.02.094
McMahon CJ, Murchan H, Prendiville T, Burch M, 2007 Jul-Aug, Long-term support with milrinone prior to cardiac transplantation in a neonate with left ventricular noncompaction cardiomyopathy. Pediatr Cardiol, DOI: 10.1007/s00246-007-0020-0

Please visit PubMed for more information on Colin McMahon's publications

Name:Dr Liam Morris
Name:Shane McHugo
Name:Irene Regan
DepartmentCoagulation Department
Name:Dr Eoin O’Cearbhaill
DepartmentSchool of Mechanical & Materials Engineering

Professional Associations

  • Fellow Royal College Physicians Ireland (FRCPI)
  • Fellow Faculty Paediatrics (FFPaeds)
  • Fellow Royal College Physicians Child Health UK (FRCPCH)
  • Fellow American Society Echocardiography (FASE)
  • Fellow American Academy Pediatrics (FAAP)
  • Fellow American Heart Association (FAHA)
  • Fellow American College Cardiology (FACC)


  • AEPC Association European Pediatric Cardiology
  • BCCA British Congenital Cardiology Association
  • ACC American College Cardiology
  • AHA American Heart Association