Dr Dewi Thomas

Dr Dewi Thomas

Consultant Cardiologist and Electrophysiologist

Practising at

Spire Cardiff Hospital

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Treatment information

Some of the principal treatments carried out by Dr Dewi Thomas at Spire include:


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Professional profile

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 a strong clinical and research background in the implantation and follow-up of pacemakers, defibrillators and resynchronisation 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.

Clinical Interests

Arrhythmia (Electrophysiology)
Atrial fibrillation

Special Clinical Interests: Cardiac Electrophysiology, encompassing the investigation and treatment of all arrhythmias; Palpitations and blackouts; Ablation of Supraventricular Tachycardias (SVT); Ablation of complex arrhythmias including Atrial Fibrillation (AF) and Ventricular Tachycardia (VT); Heart Failure; Implantable cardiac devices including Pacemakers, Biventricular pacemakers (CRT) and Defibrillators (ICDs). Ablation of supraventricular tachycardias (SVTs). Ablation of atrial fibrillation (AF). Ablation of ventricular tachycardia (VT). Implantation of biventricular pacemakers (CRT) and Defibrillators (ICDs).

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Qualification and professional memberships

MbChB / Edinburgh University Medical School / 2002
Bachelor of Medicine, Bachelor of Surgery

MRCP / Royal College of Physicians of London / 2006
Royal College of Physicians

MD / Cardiff University / 2012
Doctorate of Medicine

Certificate of Completion of Training in Cardiology / Wales / 2014
Wales Deanery

CCDS / International Board of Heart Rhythm Examiners / 2014
Certified Cardiac Device Specialist

ECES / European Heart Rhythm Association / 2016
Certified Electrophysiology Specialist

Professional memberships

Member of the Royal College of Physicians
Member of the British Heart Rhythm Society

Professional leadership

Clinical Tutor for Cardiology, Swansea University Medical School
Consultant Cardiologist and Electrophysiologist, Morriston Regional Cardiac Centre

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Research and Publication


Insights from a Small Wobble. Thomas DE, Suran BM, Leong FT

Heart rate deceleration after exercise predicts patients most likely to respond to cardiac resynchronisation therapy. Thomas DE, Exton SA, Yousef ZR

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, Yousef ZR, Kinnaird TD, Anderson RA.

Blood vessel specific vasoactivity to nitrite under normoxic and hypoxic conditions. Ingram TE, Pinder AG, Milsom AB, Rogers SC, Thomas DE, James PE

Routine issuance of clinical magnets to patients receiving implantable defibrillators: retention of information and appropriateness of use. Thomas DE, Barry JP, Churchouse W, Anderson MH.

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, Ingram TE, Vintila VD, Egan MA, Vinereanu D, Fraser AG.

A critical comparison of echocardiographic measurements used for optimizing cardiac resynchronization therapy: stroke distance is best. Thomas DE, Yousef ZR, Fraser AG.

Cardiac resynchronization therapy in coronary sinus atresia delivered using leadless endocardial pacing. Thomas DE, Child NM, Owens WA, Linker NJ, James SA, Turley AJ.

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Private contact details

Telephone 0292 054 2509
Private secretary Mrs Kim Lake
Private secretary telephone 01792 532107
Private secretary email kim.lake@wales.nhs.uk