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Last updated: 29 Jun 2020
I am a Consultant Cardiologist and Electrophysiologist at Morriston Hospital Regional Cardiac Centre and was appointed to this post in September 2016. I specialise in all aspects of heart rhythm management including the use of catheter ablation to treat arrhythmia, bringing state-of –the art experience to the ablation of complex atrial and ventricular arrhythmias. I also have an extensive clinical and research background in the implantation and follow-up of pacemakers, defibrillators and resynchronization devices, and hold international accreditation through both American and European heart rhythm societies in invasive electrophysiology and implantable device therapy.
I graduated from the University of Edinburgh in 2002, and undertook clinical training in Edinburgh and South Wales, completing subspecialty training modules in heart failure and heart rhythm management. In 2012 I was awarded a research doctorate (MD) by Cardiff University, and in 2016 I completed an advanced clinical fellowship in Electrophysiology at the James Cook University Hospital, Middlesbrough.
Areas of interest
Investigation and treatment of all forms of arrhythmia; catheter ablation of arrhythmias; atrial fibrillation; ventricular tachycardia; 3D mapping and ablation of complex atrial and ventricular arrhythmias; implantable device therapy; cardiac resynchronisation therapy; leadless pacing.
Current NHS consultant posts held
Consultant Cardiologist & Electrophysiologist,
Morriston Regional Cardiac Centre
Honorary Senior Clinical Lecturer,
Swansea University Medical School
Optimising outcomes in Cardiac Resynchronisation Therapy
Mechanisms of disease progression and new targets for therapy in atrial fibrillation
Clinical application of new mapping technologies
I am a keen Tennis player and as a junior competed at a national level. More recently I have represented and captained my local club in national doubles league competition. I enjoy many outdoor activities including surfing, and also play the piano and guitar to relax. Although with a young and rapidly growing family time to enjoy these pastimes is currently a little restricted.
2015 Medtronic Clinical Electrophysiology Fellowship, James Cook Hospital, Middlesbrough
2011 All Wales Specialist Registrars’ Research Prize.
Improving outcomes in cardiac resynchronisation therapy
2008 British Society of Echocardiography Young Investigator Award, Runner-up.
Methodology, feasibility and utility of echo-guided CRT optimisation
2006 St Jude Medical Clinical Research Fellowship, University of Wales College of Medicine
(Additional) Languages spoken
Twomey D, Thomas D, et al. WiCS leadless CRT system implantation: determining optimal endocardial LV electrode position using preprocedural strain echocardiography. Europace (2017)19 (Supp 3).
Heart Rhythm Conundrum. Davies RH, Thomas DE. BMJ 2017;357.
Ventricular Arrhythmias in Acute Coronary Syndromes; Mechanisms and management. Thomas DE et al. Continuing Cardiology Education. 2017 March; 3(1).
Insights from a Small Wobble. Thomas DE et al. Journal of Cardiovascular Electrophysiology. 2017 Jan;28(1).
Targeted placement of the WiCS-LV system in first commercial implants.Thomas DE et al. EP Lab Digest. May 2016
Cardiac resynchronization therapy in coronary sinus atresia delivered using leadless endocardial pacing. Thomas DE et al. Heart Rhythm Case Reports. 2016;2.
Pacemaker Implantation in Superior Vena Cava Obstruction: Re-canalisation, Venoplasty and Stenting. Thomas DE et al. Journal of Cardiology Cases. 2016 July; 14.
Combined subpectoral implantation of a cardioverter defibrillator and breast augmentation surgery in a patient with Emery-Dreifuss muscular dystrophy. Thomas DE et al. Future Cardiol. 2015 May;11(3).
Routine issuance of clinical magnets to patients receiving implantable defibrillators. Thomas DE et al. Open Heart. 2015 May; 20;2(1).
The value of using fractional flow reserve measurements in helping to diagnose acute left ventricular failure in the presence of normal left ventricular systolic function. Thomas DE et al. Cardiovasc Revasc Med. 2011 May-Jun;12(3).
Novel pharmacological interventions to maintain sinus rhythm after DC cardioversion. DE Thomas et al. ISRN Cardiology (2011).
Heart rate deceleration after exercise predicts patients most likely to respond to cardiac resynchronisation therapy. Thomas DE et al. Heart. 2010 Sep;96(17).
Can isovolumic acceleration be used in clinical practice to estimate ventricular contractile function? Reproducibility and regional variation of a new noninvasive index. Margulescu AD, Thomas DE et al. J Am Soc Echocardiogr. 2010 Apr;23(4).
The role of echocardiography in guiding management in dilated cardiomyopathy. Thomas DE et al. Eur J Echocardiogr. 2009 Dec;10(8).
A critical comparison of echocardiographic measurements used for optimizing cardiac resynchronization therapy: stroke distance is best. Thomas DE et al. Eur J Heart Fail. 2009 Aug;11(8).
Blood vessel specific vaso-activity to nitrite under normoxic and hypoxic conditions. Ingram TE et al. Adv Exp Med Biol. 2009;645.
Outcomes (checked and approved by medical professional body)
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- MBChB Edinburgh University 2002
- MRCP Royal College of Physicians (London) 2006
- MD Cardiff University 2012
- Certificate of Completion of Specialist Training (CCST) Wales Deanery 2014
- Certified Cardiac Device Specialist International Board of Heart Rhythm Examiners 2014
- Certified Electrophysiology Specialist European Heart Rhythm Association 2016
- Post CCT Fellowship in Cardiac Electrophsyiology University Hospital of Wales 2014
- Advanced Clinical Fellowship in Cardiac Electrophsyiology James Cook University Hospital, Middlesbrough 2015
Reference number 6050337
Details of entry to specialist register
- Certificate of Completion of Specialist Training (CCST), Wales Deanery, 2014
Affiliations / memberships
Royal College of Physicians
British Heart Rhythm Society
European Heart Rhythm Association
American Heart Rhythm Society
- Croescadarn RoadPentwynCARDIFFCF23 8XL
- 09:30 - 11:30
- 029 2073 5515
Post treatment communication
Following treatment of a Bupa member, I will communicate with GPs in line with Department of Health, GMC and appropriate professional bodies guidelines.
In the event of an urgent query following treatment, Bupa members should use the following contact details
Private Secretary, Mrs Kim Lake