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23 years of experience

Dr Alexander Sirker works as a Consultant in Interventional and General Cardiology at UCLH and St Bartholomew’s Hospital, London. 

He has specific expertise in coronary angiography, angioplasty and stenting procedures, performing these procedures for UCLH patients at St. Bartholomew’s Hospital. Other invasive and interventional procedures undertaken by Dr Sirker include pressure wire studies, intravascular ultrasound (IVUS), optical coherence tomography (OCT), rotational atherectomy and implantation of bioresorbable vascular scaffolds. His particular interests in Interventional Cardiology include i) use of the radial artery (at the wrist) for ‘keyhole’ access in diagnostic and therapeutic procedures and ii) complex coronary interventions, including treatment of bifurcation disease, calcified lesions and diseased bypass grafts. 

He also has a strong interest in clinical risk reduction and is now the site lead at St. Bartholomew’s Hospital for implementation of the new National Safety Standards for Invasive Procedures across all medical specialities.

With his broad background in General Adult Cardiology, Dr Sirker undertakes outpatient clinics at the main University College Hospital site, treating patients with conditions such as coronary artery disease, heart valve disease, high blood pressure and heart failure. 

He also deals with pre-operative cardiac assessment prior to non-cardiac surgery and with cardiovascular risk assessment more generally.

Dr Sirker trained in medicine at the University of Cambridge, graduating with First Class Honours in Physiology in 1994. He was awarded several prizes, an exhibition and three scholarships, then continued training at Cambridge University Clinical School, qualifying as a doctor in 1996 with a triple Distinction in the Final MB examinations.

His specialist training in Cardiology was undertaken at a number of leading cardiac centres, including the Royal Brompton, Harefield, and Guy’s and St Thomas’ Hospitals. His specific expertise in Interventional Cardiology was gained at King’s College Hospital, London and during an international fellowship year at the Royal Jubilee Hospital, British Columbia, Canada – a pioneering centre in the use of radial access for angioplasty and stenting.

He has formal national accreditation in echocardiography and has trained in cardiac CT. He is also an accredited specialist in General (Internal) Medicine.

Diseases, Medical Tests and Treatments
  • Transoesophageal Echocardiography
  • Congestive Heart Failure
  • Heart Attack
  • Heart Valve Problems
  • High Blood Pressure
  • Loss of consciousness (Syncope)
  • Unstable Angina
  • Angina
  • Chest Pain
  • Dizziness
  • Heart Muscle Disease
  • Pulmonary Hypertension
  • Valvular Heart Disease
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Recommended by 2 specialists
21 years of experience
Electrophysiology, Interventional Cardiology

Dr Ahsan graduated from Guys Kings and St Thomas’ Medical School in 2000 with a First Class Honours degree in his BSc and undertook his cardiology specialist training at various prestigious hospitals in London where he has worked with world-renowned experts. These include the Royal Brompton Hospital, Great Ormond Street Hospital and the Heart Hospital where he undertook his fellowship in cardiac electrophysiology and cardiac devices.

His postgraduate medical doctorate was awarded from the University College London where he evaluated strategies to optimise outcomes in patients with cardiac rhythm devices. His pioneering research work was awarded the Royal Society of Medicine National Prize in 2009 and was presented nationally and internationally in Europe and the USA. He has been a finalist in two national young investigator awards.

Dr Ahsan was appointed as a Consultant Cardiologist at the Heart Hospital, University College London Hospital and moved to the Barts Heart Centre in May 2015 following the merger of the two hospitals. He is currently one of the leads for atrial fibrillation here. 

He is also an honorary consultant at North Middlesex University Hospital where his practice encompasses all aspects of adult cardiology. Here, he has also established the first ablation service for cardiac rhythm disturbances in North London for the local population. He is an expert in managing patients with a range of cardiac symptoms and conditions and has a special interest in heart rhythm disturbances.

He regularly performs simple and complex catheter ablation procedures, using the latest technologies for all arrhythmias including atrial fibrillation. His research interest is in the field of new techniques for the management of atrial fibrillation. He is a specialist in implanting all types of cardiac devices including pacemakers, defibrillators and cardiac resynchronisation therapy. He also sees and treats patients with blackouts, chest pains and high blood pressure and performs coronary angiography.

Dr Ahsan is the lead for training within the heart rhythm department at Barts Heart Centre. 

Dr Ahsan prides himself on placing the patient at the heart of his approach. He takes the time to make a complete assessment and takes particular care to explain all aspects of the consultation and treatment options to his patients.

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Recommended by 2 specialists
29 years of experience
Interventional Cardiology

Dr Michael Bellamy is a Consultant Cardiologist based at Imperial Healthcare NHS Trust (Hammersmith), specialising in both Cardiac Imaging/Echocardiography and Interventional Cardiology. He also works at private hospitals in London, including HCA Harley Street Clinic, HSC Diagnostic Centre at 16 Devonshire Street and The Wellington Hospital.

Dr Bellamy undertakes general cardiology clinics, seeing patients with all types of cardiology problems, while jointly leading the Imperial Percutaneous Mitral Valve Programme as well as Valve Clinics and Specialist Echocardiography. He also participates in the on-call rota for the West London Heart Attack Centre based at Hammersmith Hospital, performing emergency PCI (stenting) procedures in addition to elective coronary artery disease work.

He performs a large number of cardiac imaging diagnostic procedures including echo, stress echo (exercise and Dobutamine), transoesophageal echo and 3D valve assessments and is accredited with the British Society of Echocardiography and European Association of Cardiovascular Imaging.

Dr Bellamy attained subspecialty expertise in both echocardiography / imaging and interventional cardiology, having completed his training in London teaching hospitals as well as 2 International Fellowships abroad, the first at Mayo Clinic, Rochester, Minnesota, USA (valvular heart disease) and St Vincent's University Hospital, Sydney, Australia (interventional cardiology).

He is actively involved in teaching including undergraduates at Imperial College School of Medicine, Imperial MSc programmes and postgraduate Cardiology trainees. Research interests include valve disease and percutaneous mitral valve interventions/MitraClip. He has published a large number of manuscripts in peer-reviewed journals and has contributed to book chapters in internationally renowned textbooks.

Diseases, Medical Tests and Treatments

  • 24 Hour Blood Pressure Monitor
  • Calcium Coronary Score
  • Cardiac Magnetic Resonance Scan (Cardiac MRI)
  • Cardiac Rehabilitation
  • ECG (Electrocardiogram)
  • ECG Monitor (24 Hours)
  • Echocardiogram
  • Transoesophageal Echocardiography
  • Coronary Angiography
  • Coronary Stent Insertion
  • Endomyocardial Biopsy
  • Valvuloplasty
  • Transthoracic echocardiography (Brit Society Echo Accredited)
  • Transoesophageal echocardiography (EACVI Accredited)
  • Stress echo for suspected coronary disease (exercise and pharmacological stress tests)
  • Stress echocardiography for valve assessment
  • Coronary angiography / cardiac catheterisation
  • Coronary angioplasty and stenting (PCI)
  • Invasive coronary physiology /invascular ultrasound / OCT imaging
  • Percutaneous mitral valve repair (MitraClip)
  • DC cardioversion for atrial fibrillation / arrhythmias
  • Implantable loop recorder insertion
  • Acute Coronary Syndrome
  • Arrhythmia (Irregular Heartbeat)
  • Atherosclerosis
  • Bradycardia
  • Cardiomyopathy
  • Congestive Heart Failure
  • Dizziness
  • Heart Attack
  • Heart Failure
  • Heart Murmurs
  • Heart Muscle Disease
  • Loss Of Consciousness (Syncope)
  • Palpitations
  • Valvular Heart Disease
  • MITRACLIP - percutaneous edge-to-edge mitral valve repair
  • Mitral valve disease
  • Valvular heart disease (ALL)
  • Atherosclerosis/ coronary artery disease
  • Intravascular imaging
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Recommended by 1 specialist
35 years of experience
Heart Failure, Heart Muscle Disease/Cardiomyopathy, Preventative Cardiology

Dr Denis E. PELLERIN, MD, PhD, FRCP, FESC, is an experienced and respected Consultant Cardiologist with 30 years’ experience in all aspects of adult cardiology. He was trained in Paris and has been working in London since 2001. He offers a compelling level of trust, and excellence. His private practice reputation is built upon his personalised and

professional approach, evidence-based Cardiology and patient recommendations. 

Languages spoken are English and French. 

Dr Pellerin sees patients at the Harley Street Clinic Diagnostic Centre, 16 Devonshire Street, London W1G 7AF. Same day appointments are possible. 

​For booking your private consultation or enquiries please call us on 075 3999 3666 or email to 

Dr Pellerin is fee assured with all UK private medical insurers, so consultations and

procedures will be invoiced at their agreed rates with no additional fees. 

February 2021 update:

please note that Dr Pellerin is currently available for Face-to-Face Consultations, Video consultations and telephone consultations. Under government guidelines travel is permitted for all medical purposes. 

IMPORTANT NOTE: PLEASE DO NOT HESITATE TO SEEK MEDICAL ADVICE. If you are suffering from chest pain, angina, shortness of breath, tiredness, palpitations, high blood pressure, blackouts, loss of consciousness, syncope, swollen ankles, or raised levels of cholesterol, if you have heart failure or history of heart disease then now is the time to seek a

consultation with Dr Pellerin. 

 Previous appointments 

1990-2001 Consultant Cardiologist at Antoine Beclere and Bicetre Hospitals, University of Paris Sud 

2001-2003 Senior Lecturer, Hon Consultant Cardiologist, Director of Echocardiography at St George’s Hospital NHS

Foundation Trust, London 

2003-2015 Consultant Cardiologist, Director of Echocardiography at University College London Hospitals NHS Foundation Trust. The Echocardiography Department provided service on multiple sites including UCLH, The Heart Hospital, and The National Hospital for Neurology and Neurosurgery as one of the largest Departments in Europe. 

2015- moving to the Barts Heart Centre, St. Bartholomew’s Hospital part time when services were transferred. 

Honours and prizes 

· 1984 Military decoration for courage during National Service. 

· Prizes for cardiovascular research (1) French Federation of Cardiology, (2) The Medical Research Foundation, (3) Lion Heart Honorary Prize for innovation in the field of cardiovascular research. 

· Invited as visiting Professor at (1) the Duke University, North Carolina (2) Pittsburgh University, Pennsilvania (3) Strasbourg University and (3) Paris University. 

Clinical Experience 

· I am a leading consultant cardiologist with 30 years’ experience of cardiology in tertiary referral University hospitals, first

in Paris then in London. 

· My clinical expertise as a Cardiologist covers all aspects of adult Cardiology. I have expertise in heart valve diseases,

myocardial dysfunction, risk reduction of cardiovascular and coronary artery diseases, difficult hypertension, aortic diseases, pre-operative cardiac assessment prior to surgery, and stroke assessment and prevention. Preventative

care is essential in this field. 

Cardiac Diagnostics and Imaging 

· As a specialist in cardiac imaging and diagnostic testing, I am often consulted on difficult diagnoses, the causative

mechanisms and the likely prognosis. 

· I have two accreditations from the European Society of Cardiology and I have performed, interpreted and reported more than 10,000 scans. 

· Echocardiography is part of the standard of care for cardiology patients. Dr Pellerin is highly qualified to perform

ultrasound scans and can perform these in any routine appointment. In my practice all echocardiograms are scanned and reported by myself. This provides swifter and accurate identification of diseases, peace of mind for patients who can ask questions on the spot, and often reduces the need for multiple investigations, avoiding invasive procedures unless necessary. 


I teach undergraduate and postgraduate levels, medical students, and other healthcare professionals. 


· My research involves working with patients to determine the effectiveness of new techniques and treatments. This includes the ability of cardiac diagnostic tools to provide valuable information to patient care, and clinical trials to determine the best treatments for specific conditions. 

· I published over 75 articles in peer-review journals, 20 cardiology book chapters, and 60 publications in non peer-review


· For 20 years ​I have been invited to lecture and chair sessions on many areas of cardiology and cardiac imaging at

international cardiology meetings (>160 invited Lectures and Chairmanships).

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29 years of experience
Electrophysiology, Congenital Heart Disease, Paediatric (Pediatric) Cardiology

Dr Martin Lowe is a Consultant Cardiologist and Electrophysiologist based at the Barts Heart Centre, and Great Ormond Street Hospital, London. He specialises in the treatment of arrhythmias in adults and children with catheter ablation and pacemaker / defibrillator implantation.After studying medicine at St George’s Hospital, London, he completed his specialist training in London and Cambridge, before undertaking a research fellowship at The Mayo Clinic, USA.

Dr Lowe is active in the education of trainees in his field and is a Honorary senior lecturer at University College London. He is also frequnetly involved in clinical research and his work is regularly published in peer-reviewed journals and publications. His research interests include ablation strategies in those with arrhythmias accompanying cardiomyopathy or congenital heart disease, risk stratification in patients and families predisposed to sudden cardiac death, and multisite pacing in heart failure patients.

Diseases, Medical Tests and Treatments
  • Catheter ablation
  • Pacemaker Implantation
  • ICD implantation
  • Cardioversion
  • Adult and paediatric arrhythmias
  • Arrthythmia (irregular heartbeat) 
  • Atrial Firbrillation 
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17 years of experience

Dr Antonis Pantazis is a Consultant Cardiologist at Royal Brompton & Harefield NHS Trust and he also sees patients privately, including at The Harley Street Clinic and The Princess Grace Hospital. He has many years’ experience within the field of cardiomyopathies.

He was first appointed as a Consultant Cardiologist at The Heart Hospital, University College London in 2007 and then went to work as a Consultant Cardiologist at Bart’s Heart Centre at St Bartholomew’s Hospital in 2015. Dr Pantazis was the leading cardiologist at UCLH’s neuromuscular complex care centre at the National Hospital for Neurology and Neurosurgery. In previous roles, he has also implemented clinics for arrhythmogenic cardiomyopathy (ARVC), cardio-neuromuscular and cardiac sarcoidosis. He was also the leading cardiologist for the interventional and surgical programmes for the management of left-ventricular outflow tract obstruction (LVOTO) in hypertrophic cardiomyopathy. He holds memberships of the European Society of Cardiology, the European Society of Cardiology Working Group on Myocardial and Pericardial Diseases, the Association for Inherited Cardiac Conditions and the Hellenic Cardiological Society.


Diseases, Medical Tests and Treatments
  • Heart Muscle Disease/Cardiomyopathy
  • Echocardiogram
  • Inherited Cardiac Diseases
  • Management of Left Ventricular Outflow Tract Obstruction in Hypertrophic Cardiomyopathy
  • Advanced echocardiography
  • Cardiac imaging


  • Cardiomyopathy 
  • Valvular Heart Disease




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13 years of experience
Interventional Cardiology

Dr Sam Dawkins is a cardiologist specialising in general cardiology, interventional cardiology and structural intervention, including transcatheter aortic valve implantation (TAVI), percutaneous mitral valve repair (MitraClip), PFO closure and left atrial appendage occlusion. He has expertise in cardiac CT and echocardiography offering a comprehensive service for both diagnosis and treatment. He can offer face-to-face, telephone and video consultations. 

He trained in London and Oxford and then spent two years working at Cedars Sinai Medical Center in Los Angeles, the busiest valve centre in the United States. He is one of the UK’s most experienced mitral valve operators, with expertise in percutaneous mitral valve repair and replacement. He also regularly trains other cardiologists in these procedures around the world.

He has a very broad experience in TAVI, with particular expertise in complex situations, including patients with previous aortic valve replacement or challenging vascular access.

He is the clinical lead for structural intervention in Oxford, with a busy practice consisting of coronary intervention, TAVI, MitraClip, closure of patent foramen ovale (PFO), atrial septal defect (ASD), left atrial appendage occlusion, closure of paravalvular leaks and cardiac CT.

Diseases, Medical Tests and Treatments
  • Coronary Angiography & Percutaneous coronary intervention (PCI)
  • Percutaneous mitral valve repair (MitraClip)
  • Patent foramen ovale (PFO) closure
  • Transcatheter aortic valve implantation (TAVI)
  • Transthoracic echocardiogram (TTE)
  • Balloon aortic and mitral valvuloplasty
  • General cardiology (including ECG, echocardiography, ambulatory monitoring and cardiac CT)
  • Interventional cardiology (including coronary intervention)
  • Structural intervention (including aortic, mitral and tricuspid valve intervention, paravalvular leak closure)
  • Atrial septal defect (ASD) closure
  • Patent foramen ovale (PFO) closure
  • Left atrial appendage occlusion (Watchman)
  • Acute coronary syndrome
  • Chest pain
  • Palpitations
  • Shortness of breath
  • Hypertension
  • Heart valve problems
  • Valvular heart disease
  • Coronary artery disease
  • Percutaneous coronary intervention (PCI)
  • Left atrial appendage occlusion
  • Paravalvular leak closure
  • Watchman
  • Cardiovascular health
  • Preoperative assessment
Read more
16 years of experience
Heart Failure, Heart Muscle Disease/Cardiomyopathy, General (Internal) Medicine

Konstantinos Savvatis is a Consultant Cardiologist in the Inherited Cardiovascular Diseases Unit at Barts Heart Centre in London and Honorary Associate Professor in University College London and Queen Mary University London. He trained at the Department of Cardiology at the Charité University Hospital in Berlin, Germany, one of the largest centres in Europe focusing on dilated and inflammatory cardiomyopathy. He acquired his PhD on the immunomodulatory role of matrix metalloproteinases in acute myocarditis and continued working as Clinician Scientist at the Charité and the Centre for Regenerative Therapies focusing on the role of fibrosis and fibroblasts in heart failure and cardiomyopathy.

His main clinical and academic interests are genetic and inflammatory cardiomyopathies and, especially, the risk assessment and therapy of patients with dilated cardiomyopathy, hypertrophic and arrhythmogenic cardiomyopathy, myocarditis and cardiac involvement in Neuromuscular Conditions (limb girdle, Duchenne and Becker’s muscular dystrophy, myotonic dystrophy, Friedreich’s ataxia).

He is specialised in advanced cardiovascular MRI and echocardiography.

His work has been published in several high impact journals, such as Nature Communications, Circulation, Circulation Research, JACC and European Heart Journal.

Diseases, Medical Tests and Treatments


Cardiac sarcoidosis

Arrhythmogenic cardiomyopathy

Dilated cardiomyopathy

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22 years of experience
Interventional Cardiology

Dr Ozkor is a clinical director and speciality lead running a busy NHS practice - he regularly sees patients with a wide range of common cardiac problems. He is also an appointed Consultant Cardiologist. He sees patients privately at a number of locations.

He is a specialist in complex coronary treatments such as balloon angioplasty and stenting. He also specialises in radial access procedures and regularly performs an intervention to vein grafts and left main stems. He has experience in the use of interventional adjuncts such as thrombectomy devices, distal protection and rotational atherectomy as well as the interpretation of IVUS and pressure wire data. 

Dr Ozkor has an interest in putting patient safety first, has run multiple audit projects and run major clinical governance projects. 

Diseases, Medical Tests and Treatments

  • percutaneous coronary intervention with stent 
  • TAVI implanter 
  • balloon angioplasty 
  • stenting 
  • coronary angiography 
  • angina 
  • hypertension 
  • heart failure 
  • valve disease 
  • dizziness




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45 years of experience

Dr Edward Rowland is a Consultant Cardiologist working for The Harley Street Clinic in London. He has a specialist interest in cardiac rhythm disorders, cardiac electrophysiology, cardiac implants and ablation techniques.

Dr Rowland qualified from St Bart’s Hospital Medical School in 1974. Following this, he undertook his cardiology training at The Royal Postgraduate Medical School and the National Heart Hospital. He then began working at the National Heart and Lung Institute in 1989. In 1992, he was appointed as a Senior Lecturer at St George’s Hospital Medical School, and then in 1996 he worked as a Consultant Cardiologist. He previously held the position as Chairman of the Multicentre European Radiofrequency Survey, and also the European Society of Cardiology Working Group.

Diseases, Medical Tests and Treatments
  • Cardiac Rehabilitation
  • ECG monitor (24 hours)
  • Cardiac pacing
  • CT Coronary Angiogram
  • Pacemaker Implantation
  • Bradycardia
  • Tachycardia
  • Ventricular Fibrillation
  • Atrial Fibrillation
  • Angina
  • Arrhythmia (irregular heartbeat)
  • Palpitations
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