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Our Team

Windsor-CardiologyAt Windsor Cardiology we have an ever-expanding team of highly skilled and dedicated professionals whose sole aim is to give our patients the very best care possible. Our doctors are the best and most experienced in their field, and have the skills to treat any cardiac condition. Our cardiac technicians are hand-picked not only for their expertise, but also for their professionalism and friendly manner. Our support staff are highly experienced and dedicated to giving the best service possible.

Above all, we are completely committed to providing an outstanding and first rate service to our patients. Please do let us know if you have any comments or suggestions by emailing

Dr Khalid Barakat


Dr Khalid Barakat MA (Oxon), MBBS (Lon), MD (Lon), MRCP (UK)

Consultant Cardiologist

Dr Khalid Barakat read Medicine at Trinity College Oxford and Guys and St Thomas’ Medical Schools, qualifying as a doctor in 1991. He has been practicing as a Consultant Cardiologist for ten years treating private patients in Berkshire, Buckinghamshire, Oxfordshire and West London. He is also a Consultant Cardiologist at Heatherwood and Wexham Park NHS Trust in Slough.

His specialist interests within cardiology are interventional cardiology (coronary angioplasty and stent insertion), permanent pacemaker implantation and transoesophageal echo. He was instrumental in repatriating services from London to a local setting which has been highly beneficial and popular for the local patient population. He has an active interest in teaching and is currently completing a postgraduate certificate in medical simulation and hopes to build and run a cardiac catheter lab simulation centre within East Berkshire. He hopes that this will benefit patients through improved safety in team working within the catheter lab environment.

Dr Barakat is married, lives in Oxfordshire and has three children. His major hobbies include tinkering with cars, and designing and building electronic circuits. He enjoys swimming, tennis and cricket. He is happiest walking the Chilterns with his wife and children.

Dr Paul Bhamra-Ariza


Dr Paul Bhamra-Ariza BSc (Hons) MBBS MD MRCP

Consultant Cardiologist

Dr B-A qualified from Guys and St Thomas’ in 2001 and undertook his specialist training in the South West London Cardiology training scheme. Prior to his appointment as the Interventional Fellow at St Georges Hospital, he was a research fellow at the MRC Clinical Science Centre at Hammersmith Hospital and was awarded a Doctorate of Medicine from Imperial College in 2012 for his work on myocardial blood flow measurement using cardiac MRI and positron emission tomography. In 2013 he spent a year in Sydney working with Professor David Muller at St Vincents Hospital and gained further experience in complex interventional and structural cardiology. He was appointed as a full time substantive consultant at Frimley Health NHS trust in January 2015 and works across site at Frimley Park, Wexham Park and Heatherwood Hospitals.

Specialist Interest

Dr B-A’s main clinical interest is myocardial ischemia (a condition where blood flow to the heart is reduced) and it’s treatment with percutaneous coronary intervention. His specialist interest is complex coronary intervention including rotablation and chronic coronary artery occlusions. On a day to day basis he sees patients with a wide range of common heart problems including: chest pain, high blood pressure, heart failure, valvular heart disease, referrals for investigation of palpitations and collapse, cardiovascular risk assessment, and perioperative cardiac assessment. Dr B-A coordinates a specialist perioperative risk assessment clinic for patients deemed high risk prior to non cardiac surgery and works closely with a multi-disciplinary team in order to reduce perioperative risk. Currently he takes part in the heart attack service at Wexham Park Hospital, which provides round the clock treatment for heart attack patients throughout South Buckinghamshire and East Berkshire. He is the Cardiology Clinical lead for mortality and morbidity at Wexham Park Hospital and works closely with other members of the mortality review group to improve patient safety.

Personal Profile

Dr B-A is married to Hannah and has 2 small children (Joseph and Sebastian). He is an active musician and continues to play piano. He enjoys sports and plays golf as well as being a member of the local squash club.

Membership Of Profession Societies

Royal College of Physicians


British Medical Association


British Cardiovascular Intervention Society

Dr Mark Earley


Dr Mark Earley BSc MD FRCP

Cardiac Electrophysiologist

Dr Mark Earley qualified from the University of Bristol in 1993, trained in cardiology in London and was appointed consultant at St Bartholomew’s Hospital in 2006. His subspecialty is cardiac electrophysiology – disorders of the rhythm of the heart. He is currently the treasurer of the British Heart Rhythm Society and sits on the European Heart Rhythm Association accreditation committee.

Dr Earley performs catheter ablation to prevent abnormal heart rhythms such as atrial fibrillation (AF), atrial flutter and supraventricular tachycardia (SVT). These are performed at the London Bridge Hospital where there are state of the art facilities for these complex procedures. He has worked closely with the team at Windsor Cardiology since 2007 together providing a seamless service from diagnosis at your local private hospital through to curative treatment at a specialist centre in London.

Dr Earley has a keen interest in research with 35 journal publications since 2007 and ongoing projects at St Bartholomew’s looking at curative treatment of AF, particularly ablation. He is an expert in the use of robotic catheters for ablation.

Away from work he is married with two young children and lives in Hertfordshire. He enjoys cycling, rugby and anything to do with mountains.

Dr Andrew Kelion

Dr-Andrew-Kelion Consultant Cardiologist

Dr Andrew Kelion MA, BM BCh, DM, FRCP

Consultant Cardiologist

Dr Andrew Kelion qualified as a doctor from Oxford in 1991, where he later trained in cardiology. He was Consultant Cardiologist and Director of Imaging at Harefield Hospital for 11 years, before returning to a consultant post at the John Radcliffe Hospital in Oxford.

Dr Kelion’s subspecialty interest within cardiology is noninvasive imaging, specifically echocardiography, nuclear cardiology and cardiac CT. He is well-known nationally as an advisor and educator, and is a past President of the British Nuclear Cardiology Society. He has written many research papers, guideline documents and books, including the Oxford Handbooks of Nuclear Cardiology and Cardiovascular CT.

Dr Kelion leads Windsor Cardiology’s Cardiovascular CT service at the Bridge Clinic in Maidenhead. He is also available for consultations, and has a particular interest in coronary risk assessment.

Dr Kelion lives in Northwood with his wife and four children, and is active in the local community. He enjoys classical concerts, good food and vintage port, and really should take more exercise.

Mr Mario Petrou


Mr Mario Petrou PhD, FRCS (C-Th)

Cardiac Surgeon

Mr Mario Petrou was appointed as a Consultant Cardiac Surgeon at The Royal Brompton Hospital, London in 2002. He moved to the John Radcliffe Hospital in Oxford in 2011 and began his private practice at the Manor Hospital in Oxford April 2012. Throughout this period he has worked closely with the Winsdor Cardiology team.

Mr Petrou offers a wide repertoire of adult cardiac surgery in his practice. This includes coronary by-pass surgery (on and off- pump), complex aortic root surgery, aortic and mitral valve repair techniques, aortic aneurysm repair and re-do surgeries. He also has a background experience of treating patients with cardiac failure (transplantation and mechanical assist devices).

He has consistently performed to a high level throughout his career as shown by his surgeon specific mortality and outcome results which are available in the public domain (Society of Cardiothoracic Surgeons website). He places great emphasis in pre-operative assessment, meticulous technical surgery and assiduous post -operative care and believes that all three components are essential in order to obtain an excellent result for the patient.

Having worked with some world-renowned heart surgeons including, Professor Sir Magdi Yacoub, Mr Petrou’s career has been influenced by some of the best in the field of Cardiothoracic Surgery.

Mr Petrou has published over 40 peer reviewed journal papers and other publications. Mr Petrou was awarded the McCormack Gold Medal for his outstanding performance in the Intercollegiate Examination in Cardiothoracic Surgery (Part III FRCS) in 2001.

The topic of surgery can easily carry over from work to home life as Mr Petrou’s wife, Elizabeth Belcher, is also a Thoracic Surgeon. They have 3 young children however which guarantees that ‘shop talk’ is kept to minimum. Hobbies include classical music, art and supporting West Ham United FC.

Dr Stephen Rex


Dr Stephen Rex BSc(Hons) MB BS(Hons) MRCP

Consultant Cardiologist

Dr Stephen Rex qualified as a doctor in London in 1994 and is a Consultant Cardiologist based in Berkshire, Buckinghamshire, West London and surrounding areas. He has worked as a popular private consultant for ten years and also works for the Heatherwood and Wexham Park NHS Trust.

His specialist interests within cardiology are interventional cardiology (angioplasty and stent insertion) and the implantation of pacemakers and defibrillators in the treatment of heart failure and sudden death syndrome. He also has a particular interest in teaching, as well as chairing local patient groups. Dr Rex also has a keen interest in medical technology and has embraced recent advances in technology to improve the service he gives to his patients.

Dr Rex is married with three young children and lives in Buckinghamshire. Outside work, he enjoys playing golf, skiing, travelling and walking his faithful chocolate Labrador.