MA (Cantab), MB BChir, FRCP, PhD
29 years of experience
London, W1G 8BJ
(+7 more)
24 connections in healthcare
Skill endorsed
by Professor Prabhakar Rajan, Prof. Thomas Treibel and 3 other professionals
29 years of experience
London, W1G 8BJ
(+7 more)
24 connections in healthcare
Skill endorsed
by Professor Prabhakar Rajan, Prof. Thomas Treibel and 3 other professionals
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Dr Alexander Sirker works as a Consultant in Interventional and General Cardiology at University College London Hospitals (UCLH) and St Bartholomew's Hospital, London.
He is Clinical Lead (Head of Department) for Cardiology at University College London Hospitals. He is also an Honorary Associate Professor at University College London (UCL).
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 specific expertise in coronary angiography, angioplasty and stenting procedures. Other invasive and interventional procedures undertaken by Dr Sirker include pressure wire studies, intravascular ultrasound (IVUS), and rotational atherectomy. 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.
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 sees patients with symptoms including chest pain, breathlessness, palpitations, dizziness and loss of consciousness.
He also deals with pre-operative cardiac assessment prior to non-cardiac surgery and with cardiovascular risk assessment more generally.
He has formal national accreditation in echocardiography and has trained in cardiac CT. He is also an accredited specialist in General (Internal) Medicine.
He also has a strong interest in clinical risk reduction and has acted as the site lead at St. Bartholomew's Hospital for implementation of the new National Safety Standards for Invasive Procedures across all medical specialities.
Diseases, Medical Tests and Treatments
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General Medical Council
No. 4372547
University of Cambridge
Medicine
Graduated 1996
BA (Hons) 1994 University of Cambridge
MA (Cantab) 1998 University of Cambridge
BChir 1996 University of Cambridge
MB 1997 University of Cambridge
FRCP 2017 Royal College of Physicians, London
PhD 2012 University of London
New appointment
£250Follow-up appointment
£20035 Weymouth Street, London, United Kingdom, W1G 8BJ
8A Wellington Place, St Johns Wood, London, United Kingdom, NW8 9LE
1 Welbeck St, Marylebone, London, London, United Kingdom, W1G 0AR
16 Devonshire St, Marylebone, London, United Kingdom, W1G 7AF
13-14 Devonshire Street, London, United Kingdom, W1G 7AE
United Kingdom
Wellington Place St. John's Wood, London, United Kingdom, NW8 9LE
West Smithfield, London, United Kingdom, EC1A 7BE
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This summary was created by AI based on recent reviews
Dr Alexander Sirker demonstrates a professional, caring, and clear approach. He listens to patient concerns and provides detailed explanations for diagnoses, angiograms, stent insertions, and treatment options. His thorough and excellent manner instils confidence and leaves patients feeling respected and at ease. Patients seek Dr Alexander Sirker's expertise for coronary artery disease, chest pain, breathlessness, and exercise stress tests.
I had an excellent experience with Dr. Alexander Sirker. He took the time to really listen to my concerns. He explained my results and treatment options clearly, making sure I understood every step. His caring and professional approach gave me complete confidence and peace of mind. Thanks to his guidance, I now feel much more in control of my health. I’m very grateful for his support and would highly recommend him to anyone needing a cardiologist.
Dr Sirker was patient and reassuring as well as supportive of my health concerns without making me feel uncomfortable.
Dr Sirker inspires confidence, is professional and thorough - I am pleased to have him as my Consultant.
Dr Sirker is a thoughtful, warm and kind human being. He answered all my questions with patience, taking the time to explain everything in detail and in a language that I understood. Before having a procedure in hospital he explained what to expect in great detail, likewise his after care has been exemplary. Dr Sirker is very obviously at the top of his game and I would not hesitate to recommend his services.
Dr Sirker saw through my heart issues from diagnosis, operation and sign of in a highly professional, calm and warm manner. He was thorough and supportive and made the whole process seamless.
In all relevant respects “excellent” is the appropriate assessment.
Excellent, thorough and caring expert cardiologist. Very clear in his explanations of my condition and treatment.
Dr Sirker is a leading cardiologist and expert in cardiovascular diseases. He is respected by colleagues, and well liked by patients.
29 Oct 2025
Professor Prabhakar Rajan
UrologistFantastic clinician with good patient rapport.
15 Sep 2025
Prof. Thomas Treibel
Cardiologist
Dr Martin Lowe
CardiologistHighly recommended cardiologist with great feedback from patients.
11 Jun 2024
Dr Rebecca Liu
NeurologistWhat are Dr Alexander Sirker's reviews like?
Dr Alexander Sirker's overall patient rating is 4.96 out of 5 stars on Doctify. This is based on 25 reviews.
What languages does Dr Alexander Sirker speak?
Dr Alexander Sirker speaks English
Where is Dr Alexander Sirker located?
Dr Alexander Sirker primarily practices at HCA Healthcare UK The Harley Street Clinic, located at 35 Weymouth Street, London, United Kingdom, W1G 8BJ
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What are Dr Alexander Sirker working hours?
Dr Alexander Sirker is working Thursday (09:30 - 15:00)
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Does Dr Alexander Sirker accept new patients?
Dr Alexander Sirker generally accepts new patients.
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