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Trust score 8/100
Accepting new patients
Prof
Prof Mark O'Neill
Cardiology
English
French
11,864+
Patients seen
6
Years in practice
6
Publications
2
Languages spoken
About
Professor Mark O'Neill is a Consultant Cardiologist and Professor of Cardiac Electrophysiology at St Thomas' Hospital and King's College London. He sees private patients at The Cardiac Clinic at London Bridge Hospital.
Professor O'Neill completed a DPhil in Cardiac Physiology at the University of Oxford as a Rhodes Scohlar in 1995 before graduating with first class honours from University College Dublin in 1998. He completed his subspecialty training in interventional cardiac electrophysiology at St Mary's Hospital and in the internationally renowned arrhythmia centre in Bordeaux.
Professor O'Neill was appointed as a Consultant at St Thomas' Hospital and King's College London in 2009. He became a Reader in 2011 and was appointed as Professor in 2013. Since then, he has led the arrhythmia service, the regional training programme and the cardiac electrophysiology divisional research programme. He was awarded a National Bronze Clinical Excellence award in 2016 and 2021 in recognition of the quality and breadth of both his clinical and academic work.
In his current role, Professor O'Neill treats patients with all manner of palpitations, including those caused by simple and complex heart rhythm conditions such as supraventricular tachycardia, atrial fibrillation, atrial flutter/tachycardia, arrhythmias associated with adult congenital heart disease and ventricular tachycardia. Where appropriate, he performs interventional electrophysiology procedures to manage these conditions. He spends time helping his patients to understand fully their symptoms and works with them to develop tailored treatment plans to suit their needs and concerns.
Outside of his clinical work, Professor O'Neill is an international opinion leader in cardiac electrophysiology. He is actively involved in research and has published widely in peer-reviewed journals. His research addresses the mechanisms of atrial fibrillation and the use of imaging and computational modelling techniques to improve clinical outcomes of AF ablation. He lectures regularly both in the UK and overseas on the management of atrial arrhythmias.
Professor O'Neill completed a DPhil in Cardiac Physiology at the University of Oxford as a Rhodes Scohlar in 1995 before graduating with first class honours from University College Dublin in 1998. He completed his subspecialty training in interventional cardiac electrophysiology at St Mary's Hospital and in the internationally renowned arrhythmia centre in Bordeaux.
Professor O'Neill was appointed as a Consultant at St Thomas' Hospital and King's College London in 2009. He became a Reader in 2011 and was appointed as Professor in 2013. Since then, he has led the arrhythmia service, the regional training programme and the cardiac electrophysiology divisional research programme. He was awarded a National Bronze Clinical Excellence award in 2016 and 2021 in recognition of the quality and breadth of both his clinical and academic work.
In his current role, Professor O'Neill treats patients with all manner of palpitations, including those caused by simple and complex heart rhythm conditions such as supraventricular tachycardia, atrial fibrillation, atrial flutter/tachycardia, arrhythmias associated with adult congenital heart disease and ventricular tachycardia. Where appropriate, he performs interventional electrophysiology procedures to manage these conditions. He spends time helping his patients to understand fully their symptoms and works with them to develop tailored treatment plans to suit their needs and concerns.
Outside of his clinical work, Professor O'Neill is an international opinion leader in cardiac electrophysiology. He is actively involved in research and has published widely in peer-reviewed journals. His research addresses the mechanisms of atrial fibrillation and the use of imaging and computational modelling techniques to improve clinical outcomes of AF ablation. He lectures regularly both in the UK and overseas on the management of atrial arrhythmias.
“Evidence-based care tailored to each patient — taking the time to explain options and shared decisions.”
— Prof Mark O'Neill
Education & training
-
2010–2016 MD · Medicine and Surgery
-
2016–2020 Residency · Cardiology
Career & appointments
-
2020-09–2021-08 Junior consultant
Licenses & insurance
Medical licenses
— Organización Médica Colegial de España (OMC)
Board certifications
European Board of Cardiology
Malpractice insurance:
AXA Healthcare Liability · 3,000,000 EUR coverage
· No claims on file
Procedures performed
| Procedure | Code | Lifetime count |
|---|---|---|
| Cardiac consultation | 99244 | 436 |
| Echocardiogram | 93306 | 2,123 |
| Stress test | 93015 | 1,373 |
| Holter monitor | 93225 | 2,000 |
| Coronary angiography | 93454 | 1,751 |
| PCI / coronary stent | 92928 | 2,961 |
| Pacemaker implantation | 33208 | 1,130 |
Services & pricing
| Service | Duration | Modality | Price |
|---|---|---|---|
| New patient consultation (60m) | 60 min | in_clinic|telemed | 240.00 EUR |
| Follow-up consultation (30m) | 30 min | in_clinic|telemed|phone | 120.00 EUR |
| Stress test | 30 min | in_clinic | 240.00 EUR |
| Holter monitor | 60 min | in_clinic | 840.00 EUR |
| Coronary angiography | 90 min | in_clinic | 960.00 EUR |
| PCI / coronary stent | 30 min | in_clinic | 720.00 EUR |
Office, team & in practice
Videos
Research & publications
h-index: 11 · i10: 4
-
Long-term follow-up of Cardiology across
DOI: 10.9658/euroclin.2026.0 · PMID: 35572045 · cited by 158
-
Validation of clinical scoring in Cardiology
DOI: 10.2939/euroclin.2025.1 · PMID: 34186845 · cited by 132
Invited talks
- Practical updates in Cardiology European Annual Congress (Cardiology) · Vienna · 2024 · invited
- Single-centre experience in Cardiology National Society Meeting · · 2023 · oral abstract
Awards & memberships
Awards
- 🏆 Top-rated Cardiology — · EuroClinics Patient Choice · 2025 · regional
Society memberships
- European Society of Cardiology (ESC) — Member · since 2021
- American Heart Association (AHA) — Member · since 2021
- EAPCI — Member · since 2021
- European Union of Medical Specialists (UEMS) — Member · since 2021
Patient reviews
- Bedside Manner
- 0.05
- Knowledge
- 0.08
- Wait Time
- 3.80
- Staff Friendliness
- 0.02
- Ease Of Appointment
- 4.00
- Value For Money
- 4.10
- Would Recommend Pct
- 4
-
★ 5 verified visit
“Very thorough first visit — explained every step. Booking was easy and the staff were welcoming.”
-
★ 5 verified visit
“Took time to listen and reviewed all my previous results. I would absolutely recommend.”
-
★ 4 verified visit
“Professional and knowledgeable. Wait on the day was a bit long, otherwise excellent.”
Articles by this doctor
- Patient education Patient guide to Cardiology
- Awareness When should you see a cardiology?
For international patients
- Coordinator
- Patient liaison · professor.mark.oneill.1@euroclinics.example
