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

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.

Regan IE, Cox D, Kelleher ST, Nolan B, Shaw K, Smith OP, McMahon CJ, 2023 Nov 22, Towards a greater understanding of reduced response to aspirin in children with congenital heart disease post-cardiac surgery using immature platelet fraction. Thromb Res, DOI: 10.1016/j.thromres.2023.11.014
Anderson RH, Spicer DE, McMahon CJ, Kumar RK, Tretter JT, 2023 Dec 1, How best can we name the channels seen in the setting of deficient ventricular septation? Cardiol Young, DOI: 10.1017/S1047951123003943
Windram JD, Neal A, McMahon CJ, 2023 Apr, Evolution in Congenital Cardiology Education: The Rise of Digital-Learning Tools. CJC Pediatr Congenit Heart Dis, DOI: 10.1016/j.cjcpc.2022.12.005
McMahon CJ, Milanesi O, Pitkänen-Argillander O, Albert-Brotons DC, Michel-Behnke I, Voges I, Sendzikaite S, Heying R, 2023 Aug 29, Assessment for learning of paediatric cardiology trainees in 41 centres from 19 European countries. Cardiol Young, DOI: 10.1017/S1047951123003098
Bassareo PP, Duignan S, James A, Dunne E, McMahon CJ, Walsh KP, 2023 Aug 16, Isolated left ventricular apical hypoplasia: Systematic review and analysis of the 37 cases reported so far. World J Clin Cases, DOI: 10.12998/wjcc.v11.i23.5494
Cantinotti M, McMahon CJ, Marchese P, Köstenberger M, Scalese M, Franchi E, Santoro G, Assanta N, Jacquemyn X, Kutty S, Giordano R, 2023 Jul 10, Echocardiographic Parameters for Risk Prediction in Borderline Right Ventricle: Review with Special Emphasis on Pulmonary Atresia with Intact Ventricular Septum and Critical Pulmonary Stenosis. J Clin Med, DOI: 10.3390/jcm12144599
Franklin WJ, McMahon CJ, Penny DJ, 2023 May 1, In Memoriam: Michael R. Nihill, MBBS (1936-2023). Tex Heart Inst J, DOI: 10.14503/THIJ-23-8151
Magner C, Jenkins D, Koc F, Tan MH, O'Toole M, Boyle J, Maguire N, Duignan S, Murphy K, Ross P, Stanton C, McMahon CJ, 2023 Mar 31, Protocol for a prospective cohort study exploring the gut microbiota of infants with congenital heart disease undergoing cardiopulmonary bypass (the GuMiBear study). BMJ Open, DOI: 10.1136/bmjopen-2022-067016
Linnane N, Alshahrani D, Kenny DP, Walsh KP, McMahon CJ, 2023 Sep, Evolution in the management of aorta to left ventricular tunnel in a national congenital cardiology centre. Cardiol Young, DOI: 10.1017/S1047951123000586
Bassareo PP, Chessa M, Di Salvo G, Walsh KP, Mcmahon CJ, 2023 Feb 22, Strategies to Aid Successful Transition of Adolescents with Congenital Heart Disease: A Systematic Review. Children (Basel), DOI: 10.3390/children10030423
Petersen SE, Jensen B, Aung N, Friedrich MG, McMahon CJ, Mohiddin SA, Pignatelli RH, Ricci F, Anderson RH, Bluemke DA, 2023 Mar, Excessive Trabeculation of the Left Ventricle: JACC: Cardiovascular Imaging Expert Panel Paper. JACC Cardiovasc Imaging, DOI: 10.1016/j.jcmg.2022.12.026
Alshahrani D, Linnane N, McCrossan B, Oslizlok P, McMahon CJ, Walsh KP, Kenny DP, 2023 Jun, Transfemoral Perimembranous Ventricular Septal Defect Device Closure in Infants Weighing ≤ 10 kg. Pediatr Cardiol, DOI: 10.1007/s00246-023-03100-5
Kim ME, Tretter J, Wilmot I, Hahn E, Redington A, McMahon CJ, 2023 Apr, Entrustable Professional Activities and Their Relevance to Pediatric Cardiology Training. Pediatr Cardiol, DOI: 10.1007/s00246-022-03067-9
Bassareo PP, McMahon CJ, 2022 Nov 24, Metabolomics: A New Tool in Our Understanding of Congenital Heart Disease. Children (Basel), DOI: 10.3390/children9121803
McMahon CJ, Hickey EJ, Nolke L, Penny DJ, 2023 Mar, Organizational Culture as a Determinant of Outcome in Teams: Implications for the Pediatric Cardiac Specialist. Pediatr Cardiol, DOI: 10.1007/s00246-022-03041-5
McMahon CJ, Sendžikaitė S, Jegatheeswaran A, Cheung YF, Madjalany DS, Hjortdal V, Redington AN, Jacobs JP, Asoodar M, Sibbald M, Geva T, van Merrienboer JJG, Tretter JT, 2022 Nov, Managing uncertainty in decision-making of common congenital cardiac defects. Cardiol Young, DOI: 10.1017/S1047951122003316
Cantinotti M, Marchese P, Franchi E, Pizzuto A, Corana G, Viacava C, Barnes BT, Kutty S, Assanta N, McMahon CJ, Koestenberger M, Giordano R, 2022 Sep 28, Screening of Coronary Artery Origin by Echocardiography: Definition of Normal (and Abnormal) Take-Off by Standard Echocardiographic Views in a Healthy Pediatric Population. Healthcare (Basel), DOI: 10.3390/healthcare10101890
Fenton M, Shaw K, Murchan H, Duignan S, Dunne E, McMahon CJ, 2022 Oct, Daratumumab provides transient response of antibody mediated rejection post pediatric orthotopic heart transplantation. J Heart Lung Transplant, DOI: 10.1016/j.healun.2022.06.017
James A, Foley R, Murchan H, Hasan A, DeRita F, Reinhardt Z, McMahon CJ, 2023 Mar, Aortic valve replacement using On-X valve in a child postorthotopic heart transplantation. Cardiol Young, DOI: 10.1017/S1047951122002001
Duignan S, Doddy F, McMahon CJ, Prendiville T, Lynch C, Franklin O, 2022 Dec, Severe Restriction of a VSD and Development of Pulmonary Atresia in a Patient with Transposition of the Great Arteries: Fetal Diagnosis. Pediatr Cardiol, DOI: 10.1007/s00246-022-02944-7
Bassareo PP, Mcmahon CJ, Prendiville T, James A, Roberts P, Oslizlok P, Walsh MA, Kenny D, Walsh KP, 2023 Jan, Planning Transition of Care for Adolescents Affected by Congenital Heart Disease: The Irish National Pathway. Pediatr Cardiol, DOI: 10.1007/s00246-022-02955-4
Duignan S, O'Marcaigh A, Russell J, Mehanna R, McDermott M, Fenton M, McMahon CJ, 2022 Jun, Post-transplant lymphoproliferative disorder presenting as supraglottitis following pediatric heart transplantation treated with EBV-specific cytotoxic T-lymphocytes. J Heart Lung Transplant, DOI: 10.1016/j.healun.2022.02.019
Ahern S, McMahon CJ, Nölke L, 2022 Jul 11, An invited commentary on 'Clinical outcomes of early closure versus conservative diagnosis with atrial septal defect: a nationwide population-based cohort study'. Eur J Cardiothorac Surg, DOI: 10.1093/ejcts/ezac199
Cantinotti M, Marchese P, Giordano R, Franchi E, Assanta N, Koestenberger M, Jani V, Duignan S, Kutty S, McMahon CJ, 2023 Jan, Echocardiographic scores for biventricular repair risk prediction of congenital heart disease with borderline left ventricle: a review. Heart Fail Rev, DOI: 10.1007/s10741-022-10230-0
McMahon CJ, Heying R, Budts W, Cavigelli-Brunner A, Shkolnikova M, Michel-Behnke I, Kozlik-Feldmann R, Wåhlander H, DeWolf D, Difilippo S, Kornyei L, Russo MG, Kaneva-Nencheva A, Mesihovic-Dinarevic S, Vesel S, Oskarsson G, Papadopoulos G, Petropoulos AC, Cevik BS, Jossif A, Doros G, Krusensjerna-Hafstrom T, Dangel J, Rahkonen O, Albert-Brotons DC, Alvares S, Brun H, Janousek J, Pitkänen-Argillander O, Voges I, Lubaua I, Sendzikaite S, Magee AG, Rhodes MJ, Blom NA, Bu'Lock F, Hanseus K, Milanesi O, 2022 Dec, Paediatric and adult congenital cardiology education and training in Europe. Cardiol Young, DOI: 10.1017/S104795112100528X
Ng LY, Nolke L, James A, Grant B, Franklin O, Redmond JM, McGuinness J, Walsh K, McMahon CJ, 2022 Jul, Multimodality imaging in delineation of complex sinus venosus 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, 2022 May, 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 Dec, 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 Nov, 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, 2022 Feb, 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 Oct, 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

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