MA (Cantab), MB BChir, FRCP, PhD
29 years of experience
London, W1G 8BJ
(+7 more)
28 connections in healthcare
Skill endorsed
by Professor Howard Branley, Dr Bhavik Modi and 8 other professionals
29 years of experience
London, W1G 8BJ
(+7 more)
28 connections in healthcare
Skill endorsed
by Professor Howard Branley, Dr Bhavik Modi and 8 other professionals
Areas of expertise
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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
£275Follow-up appointment
£22535 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.
Dr Sirker is just what I wanted for my consultations. He is very knowledgeable, explains confidently the reasoning behind his explanations and assertions and listens to what a patient wants to ask, responding with logical and informed specialist insights. My only reason for giving a 4 star rating for the overall assessment was that even though my final session started a little late (I was early) I felt a little hurried towards its end. This had not occurred previously so I think it was an exception. The key point is that I would be happy to see him again if I need specialist interventional Cardiology advice.
Dr Sirker is a very diligent and thorough heart specialist.He listens to his patients and with their contribution establishes clear goal and processes to achieve them.
I was given a clear and reassuring explanation of what to expect at my pre-assessment consultation. Dr Sirker took the time to listen to my concerns - and those of my wife - and to answer them simply but with expertise. On the day, he visited me in my room prior to the procedure, again to reassure about what to expect as well as to sign-off relevant procedural consents. During the procedure - for which I was conscious - he regularly checked in on how I was feeling and whether I was experiencing any discomfort. He was supported by an excellent, compassionate team and they all reacted to my replies. After the procedure he revisited me in my room, told me how well things had gone, and left me with a clear understanding of what to expect next. I could not recommend him and his team more highly.
Very nicely and satisfying combination all the way. A very prompt answer been given to me, any question is been deleted… I am very proud to be Dr SIRKER patient.
Dr Sirker is a highly skilled professional and very thorough. He is courteous and efficient (as is his PA).
My appointments with Dr Sirker have been very positive experiences. He is courteous and reassuring in manner; most knowledgeable and considered in approach. He seeks creative ways forward always. I enjoy meeting with him to resolve my progress and his reporting back is prompt and clear.
Dr Sirker was so lovely… I could not wish to be with someone else. He is so very clever and honestly explains things very easily. I would and will see him again and I am sure he will keep me well.. Thanking him so very much.
My visits to Dr.Sirker have always been marked by his courtesy and efficiency. I have complete trust in his judgement.
On every occasion, I have found Dr Sirker to be excellent - knowledgeable, concerned, clear in explanation and regarding options - and most of all thoughtful, friendly and with a lightness in conversation..
Alex is great cardiologist. Very professional with excellent patient feedback.
26 Oct 2026
Professor Howard Branley
Respiratory DoctorDr Sirker is a great colleague and a skilful cardiologist with the patient’s best interest always at the forefront of his approach. I would have no hesitation in recommending him..
26 Oct 2026
Dr Bhavik Modi
CardiologistSafe and very capable operator
26 Oct 2026
Dr Sam Firoozi
CardiologistAlex was one of the smartest guys in my year at Cambridge. No surprise that he's also a very good Cardiologist...
26 Oct 2026
Professor Luke Howard
Respiratory DoctorFind out more on the Doctify Health hub for Dr Alexander Sirker's specialty, Cardiology.
What 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 37 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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