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Oliver Segal

Oliver Segal
Consultant Cardiologist


Dr Oliver Segal is a top London Consultant Cardiologist and Electrophysiologist specialising in managing patients with all types of heart rhythm problems, including atrial fibrillation, SVT, palpitations & irregular heart beats and black-outs.  

He is an expert in performing catheter ablation for all types of arrhythmia, implanting pacemakers, defibrillators and biventricular devices. He also implants left atrial appendage occlusion devices. Dr Segal sees patients at the Harley Street Clinic, but can also see patients in Surrey and Kent.


London Cardiologist

A highly qualified consultant, Dr Segal has over 10 years of experience in his field of expertise. He has performed an extensive range of procedures including over 1000 ablations and more than 900 device implantation procedures. He was appointed a Consultant Cardiologist & Electrophysiologist at The Heart Hospital, UCLH in 2008. He trained at the London Chest, St. Bartholomew’s, St. Mary’s and St. George’s Hospitals in London as well as completing a fellowship at the world-renowned Electrophysiology unit in London, Ontario in 2007 with Prof. George Klein. Dr Segal won first prize for his doctorate research on ventricular tachycardia at the Heart Rhythm Society in San Francisco in 2004. He was appointed a fellow of the Heart Rhythm Society in 2012 and a fellow of the Royal College of Physicians in 2013.

Since his appointment he has been one of the UK’s leading consultants, pioneering the use of the laser balloon for AF ablation and setting up the left atrial appendage occlusion device programme at UCLH for patients with AF who are intolerant of anticoagulants. He sits on the Heart Rhythm UK exam setting committee and is a director of a number of courses for trainee doctors and allied professionals. 


Harley Street Clinic

Dr Segal sees outpatients in his consulting rooms at The Harley Street Clinic Diagnostic Centre. There is an extensive range of cardiac investigations available within the same building including echocardiograms, 24 hour ECGs, exercise testing, 24 hour blood pressure monitor fittings and pacemaker checks which can often be undertaken at the time of consultation. Dr Segal also performs Reveal Linq device insertion at the Diagnostic Centre meaning hospital admission isn`t required. Private patients who require hospital admission for investigations and treatments are usually admitted to The Harley Street Clinic.

    Clinical interests

  • Heart conditions treated by Dr Segal consist of:

    • Atrial Fibrillation & Flutter 
    • AF Ablation 
    • SVT (Supraventricular Tachycardia) 
    • HeartPalpitations 
    • Dizzy Spells & Blackouts 
    • Reveal Linq insertion 
    • Pacemakers & ICDs 
    • Biventricular Pacemakers for Heart Failure 
    • Lead Extraction 
    • The Watchman Device

    Research interests

  • Dr Segal remains active in research and has been the primary investigator for a number of national and international research studies and has more than 40 peer reviewed publications. Latest publications include:

    • Providencia R, Teixeira C, Segal OR, Ullstein A, Lambiase PD. Call for joint informed consent in athletes with inherited cardiac conditions. Open Heart. 2017 Jan 30;4(1):e000516.
    • Providencia R, Craveiro Barra S, Papageorgiou N, Ioannou A, Rogers D, Wongwarawipat T, Falconer D, Duehmke R, Colicchia M, Babu GG, Segal O, Sporton S, Dhinoja M, Ahsan SY, Ezzat M. Dual-site Right Ventricular Pacing in Patients Undergoing Cardiac Resynchronization Therapy: Results of a Multicentre Propensity Matched Analysis. Pacing Clin Electrophysiol. 2017 Jul 21. doi: 10.1111/pace.13145.
    • Providencia R, Segal OR. Is it time to loosen the restrictions on athletes with cardiac disorders competing in sport? Br J Sports Medicine 2017 (in press)
    • Honarbakhsh S, Providencia R, Srinivasan N, Ahsan S, Lowe M, Rowland E, Hunter RJ, Finlay M, Segal O, Earley MJ, Chow A, Schilling RJ, Lambiase PD. A propensity matched case-control study comparing efficacy, safety and costs of the subcutaneous vs. transvenous implantable cardioverter defibrillator. Int J Cardiol 2016;228:280-285
    • Papageorgiou N, Providência R, Srinivasan N, Bronis K, Moscoso Costa F, Cavaco D, Adragao P, Tousoulis D, Hunter R, Schilling R, Segal OR, Chow AW, Rowland E, Lowe M, Lambiase PD. Adenosine-guided pulmonary vein isolation versus conventional pulmonary vein isolation in patients undergoing atrial fibrillation ablation: an updated meta-analysis. Int J Cardiol 2016;227:151-160
    • Betts TR, Leo M, Panikker S, Kanagaratnam P, Koa-Wing M, Davies DW, Hildick-Smith D, Wynne DG, Ormerod O, Segal OR, Chow AW, Todd D, Cabrera Gomez S, Kirkwood GJ, Fox D, Pepper C, Foran J, Wong T. Percutaneous left atrial appendage occlusion using different technologies in the United Kingdom: A multicenter registry. Catheter Cardiovasc Interv. 2017;15:484-492
    • Providência R, Teixeira C, Segal OR, Ullstein A, Elliott P, Lambiase DP. A Call for Joint Informed Consent in Athletes with Inherited Cardiac Conditions. Open Heart 2016 (in press)
    • Providência R, Boveda S, Defaye P, Segal O, Algalarrondo V, Sadoul N, Lambiase P, Piot O, Klug D, Perier MC, Bouzeman A, Barra S, Bories MC, Gras D,  Fauchier L, Bordachar P, Babuty D, Deharo JC, Leclercq C, Marijon E, DAI-PP Investigators. Outcome of Primary Prevention Implantable Cardioverter Defibrillator Therapy According to New York Heart Association Functional Classification. AM J Cardiol 2016;118:1225-1232
    • Babu, GG, Webber M, Providência R, Kumar S, Gopalamurugan AB, Rogers D, Daw H, Ahsan S, Khan F, Chow A, Lowe M, Rowland E, Lambiase P, Segal OR. Ventricular Arrhythmia Burden in Patients with Heart Failure and Cardiac Resynchronization Devices - The Importance of Renal Function. J Cardiovasc Electrophysiol 2016 (in press)
    • Srinivasan NT, Orini M, Simon RB, Providência R, Khan F, Segal OR, Babu G, Bradley R, Rowland E, Ahsan S, Chow AW, Lowe M, Taggart P, Lambiase P. Ventricular stimulus site influences dispersion of depolarization in the intact human heart. Am J Physiol Heart Circ Physiol 2016; 311:H545-54
    • Providencia R, Elliott P, Patel K, McCready J, Babu G, Srinivasan N, Bronis K, Papageorgiou N, Chow A, Rowland E, Lowe M, Segal OR, Lambiase PD. Catheter ablation for atrial fibrillation in hypertrophic cardiomyopathy: a systematic review and meta-analysis. Heart 2016; 102:1533-4

    Book Chapters:

    • Opel A, Segal OR. “Cardiac pacing and implantable cardioverter/defibrillators” in Oh’s Intensive Care Manual (7th Edition), (Eds.) A Bersten & N Soni. Butterworth, Heinemann, Elsevier 2014
    • Segal OR, Linton NF, Malcolme-Lawes L, Davies DW. “Three-Dimenisonal Cardiac Mapping Techniques in Catheter Ablation” in Electrophysiological Disorders of the Heart, Chapter 92, 1319-1328. (Eds.) Saksena S and Camm AJ. Elsevier Saunders, Philadelphia, USA, 2012
    • Segal OR, Koa-Wing M, Jarman J, Peters NS, Markides V, Davies DW. “Intracardiac Mapping” in Comprehensive Electrocardiology (2nd Edition), (Eds.) Camm AJC & MacFarlane PW. Springer 2010
    • Segal OR, Markides V, Davies DW, Peters NS. “Temporary cardiac pacing” in Cardiac Pacemakers and Defibrillation: All you wanted to know (1st Edition), (Eds.) Chow AWC & Buxton AE. Blackwell 2006
    • Markides V, Segal OR, Tondato F, Peters NS. “Mapping” in Cardiac Electrophysiology: From Cell to Bedside (4th Edition), (Eds.) Zipes DP & Jalife J. WB Saunders 2004 
Featured Service
  • Cardiology - Adult

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