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.

Ng LY, Nolke L, James A, Grant B, Franklin O, Redmond JM, McGuinness J, Walsh K, McMahon CJ, 2021 Sep 15, Multimodality imaging in delineation of complex sinus venous defects and treatment outcomes over the last decade. Cardiol Young, DOI: 10.1017/S1047951121003851
Foley R, Duignan S, McArdle L, Betts DR, Green A, McMahon CJ, 2021 Sep 15, Nicolaides-Baraitser syndrome in a patient with hypertrophic cardiomyopathy and SMARCA2 gene deletion. Cardiol Young, DOI: 10.1017/S1047951121003826
Kelleher ST, McMahon CJ, James A, 2021 Sep 12, Necrotizing Enterocolitis in Children with Congenital Heart Disease: A Literature Review. Pediatr Cardiol, DOI: 10.1007/s00246-021-02691-1
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, 2021 Jun 22, Outcomes From Pediatric Ablation: A Review of 20 Years of National Data. JACC Clin Electrophysiol, DOI: 10.1016/j.jacep.2021.03.012
Shine AM, Foyle L, Gentles E, Ward F, McMahon CJ, 2021 Oct, Growth and Nutritional Intake of Infants with Univentricular Circulation. J Pediatr, DOI: 10.1016/j.jpeds.2021.06.037
Meenaghan SM, Nugent GM, Dee EC, Smith HA, McMahon CJ, Nolke L, 2021 Aug, Health-Related Quality of Life in Pediatric Cardiac Patients After Extracorporeal Life Support. Pediatr Cardiol, DOI: 10.1007/s00246-021-02629-7
O'Sullivan DM, Foley R, Proctor K, Gallagher S, Deery A, Eidem BW, McMahon CJ, 2021 Apr, The Use of Virtual Reality Echocardiography in Medical Education. Pediatr Cardiol, DOI: 10.1007/s00246-021-02596-z
Linnane N, Nasef MA, McMahon CJ, McGuinness J, McCrossan B, Oslizlok P, Walsh KP, Kenny D, 2021 Aug 1, Right ventricular outflow tract stenting in symptomatic infants without the use of a long delivery sheath. Catheter Cardiovasc Interv, DOI: 10.1002/ccd.29708
McMahon CJ, Tretter JT, Redington AN, Bu'Lock F, Zühlke L, Heying R, Mattos S, Krishna Kumar R, Jacobs JP, Windram JD, 2021 Apr 12, Medical education and training within congenital cardiology: current global status and future directions in a post COVID-19 world. Cardiol Young, DOI: 10.1017/S1047951121001645
Duane B, Lyne A, Faulkner T, Windram JD, Redington AN, Saget S, Tretter JT, McMahon CJ, 2021 Mar 9, Webinars reduce the environmental footprint of pediatric cardiology conferences. Cardiol Young, DOI: 10.1017/S1047951121000718
Linnane N, Green A, McMahon CJ, 2021 May, An unusual case of tetralogy of Fallot with an absent pulmonary valve associated with a retro-aortic innominate vein in a patient with a 16p12.2 microdeletion. Cardiol Young, DOI: 10.1017/S1047951120004667
McMahon CJ, Tretter JT, Faulkner T, Krishna Kumar R, Redington AN, Windram JD, 2021 May, Are e-learning Webinars the future of medical education? An exploratory study of a disruptive innovation in the COVID-19 era. Cardiol Young, DOI: 10.1017/S1047951120004503
McMahon CJ, Gallagher S, James A, Deery A, Rhodes M, van Merriënboer JJG, 2021 Apr, Does high-variation training facilitate transfer of training in paediatric transthoracic echocardiography? Cardiol Young, DOI: 10.1017/S1047951120004412
Valverde I, Singh Y, Sanchez-de-Toledo J, Theocharis P, Chikermane A, Di Filippo S, Kuciñska B, Mannarino S, Tamariz-Martel A, Gutierrez-Larraya F, Soda G, Vandekerckhove K, Gonzalez-Barlatay F, McMahon CJ, Marcora S, Napoleone CP, Duong P, Tuo G, Deri A, Nepali G, Ilina M, Ciliberti P, Miller O, AEPC COVID-19 Rapid Response Team*., 2021 Jan 5, Acute Cardiovascular Manifestations in 286 Children With Multisystem Inflammatory Syndrome Associated With COVID-19 Infection in Europe. Circulation, DOI: 10.1161/CIRCULATIONAHA.120.050065
McHugo VS, Nolke L, Delassus P, MaCarthy E, McMahon CJ, Morris L, 2020 Oct, The impact of compliance on Stage 2 uni-ventricular heart circulation: An experimental assessment of the Bidirectional Glenn. Med Eng Phys, DOI: 10.1016/j.medengphy.2020.07.012
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

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