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Dr Alexander Sirker

MA (Cantab), MB BChir, FRCP, PhD

Cardiologist

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

4.96

/5

(25 reviews)

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

Areas of expertise

All
Reviews
Skill Endorsements
Coronary Artery Disease
8
3
Coronary Stent Insertion
6
Chest Pain
5
3

Contact

Book


Expert in:

About Dr Alexander Sirker

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

  • Heart Attack
  • Heart Valve Problems
  • High Blood Pressure
  • Loss of consciousness (Syncope)
  • Unstable Angina
  • Angina
  • Chest Pain
  • Dizziness
  • Valvular Heart Disease
  • Transthoracic echocardiography
  • 12 lead ECG
  • Holter (ambulatory ECG)
  • Ambulatory BP monitoring
  • CT coronary angiography
  • Coronary angiography
  • Coronary angioplasty and stenting

Subspecialties

  • Interventional Cardiology

Areas of expertise

All
Reviews
(48)
Skill Endorsements
(10)

Click the bar to read reviews or skill endorsements

Coronary Artery Disease
8
3
Coronary Stent Insertion
6
Chest Pain
5
3
Breathlessness
5
1
Exercise Stress Test
4
CT Coronary Angiogram
4
ECG (Electrocardiogram)
3
Cardiovascular Disease
2
1
High Blood Pressure (Hypertension)
2
Coronary Angiography
2
Valvular Heart Disease
2
Heart Attack
2
Angioplasty
1
Palpitations
1
Heart Valve Problems
1
Stress Echocardiogram
1
Dobutamine Stress Echocardiogram
1
24 Hour Blood Pressure Monitor
Acute Coronary Syndrome (ACS)
Angina
Atherosclerosis
Calcium Coronary Score
Cardiac Shock Wave Therapy (CSWT)
Cardioversion
ECG Holter Monitor
Echocardiogram (Cardiac Ultrasound)
Heart Murmurs
Heart Muscle Disease
Heart Scan
Intravascular Ultrasound
Loss of Consciousness
Pressure Wire Study (Coronary Angiography)
Rotablation (Coronary Arteries)
Unstable Angina

Registered with

General Medical Council

No. 4372547


Education

University of Cambridge

Medicine

Graduated 1996


Qualifications

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


Languages spoken

  • English

Insurers

  • AXA Health
  • General and Medical
  • Bupa Fee Assured
  • The Exeter
  • Simply Health (Dental)
  • Cigna
  • Bupa
  • WPA
  • Allianz Worldwide Care
  • Aviva Health
  • Vitality

Fees

  • New appointment

    £250
  • Follow-up appointment

    £200
*May vary on location

Locations

HCA Healthcare UK The Harley Street Clinic

35 Weymouth Street, London, United Kingdom, W1G 8BJ

4.75(3,340 reviews)

Opening hours

Monday - Friday
Saturday
Sunday

Facilities

Paid Parking
View practice profile

Opening hours

Monday - Friday
Saturday
Sunday

Facilities

Paid Parking
View practice profile

HCA Healthcare UK The Wellington Hospital

8A Wellington Place, St Johns Wood, London, United Kingdom, NW8 9LE

4.68(3,195 reviews)

Opening hours

Monday - Friday
Saturday
Sunday

Facilities

Paid Parking
View practice profile

Welbeck

1 Welbeck St, Marylebone, London, London, United Kingdom, W1G 0AR

4.91(1,518 reviews)

Opening hours

Monday - Friday
Saturday
Sunday

Facilities

Wheelchair Accessible
Paid Parking
View practice profile

Devonshire Diagnostic Centre

16 Devonshire St, Marylebone, London, United Kingdom, W1G 7AF

4.75(561 reviews)

Opening hours

Monday - Friday
Saturday
Sunday

The Physicians' Clinic London

13-14 Devonshire Street, London, United Kingdom, W1G 7AE

4.87(466 reviews)

Opening hours

Monday
Tuesday
Wednesday
Thursday
09:30 - 15:00
Friday
Saturday
Sunday

Facilities

Wheelchair Accessible
View practice profile

Harley Street Diagnostic Centre

United Kingdom

0.00(0 reviews)

Opening hours

Monday - Friday
Saturday
Sunday

The Wellington Cardiac Centre

Wellington Place St. John's Wood, London, United Kingdom, NW8 9LE

0.00(0 reviews)

Opening hours

Monday - Friday
Saturday
Sunday

St Bartholomew's Hospital

West Smithfield, London, United Kingdom, EC1A 7BE

0.00(0 reviews)

Opening hours

Monday - Friday
Saturday
Sunday

Areas of expertise

All
Reviews
Skill Endorsements
Coronary Artery Disease
8
3
Coronary Stent Insertion
6
Chest Pain
5
3

Contact

Book

Reviews

AI Review Summary

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.

5
verified patient
16 Sep 2025

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.

5
verified patient
26 Aug 2025

Thoroughly professional and caring

5
verified patient
26 Aug 2025

Dr Sirker was patient and reassuring as well as supportive of my health concerns without making me feel uncomfortable.

Patient seen for:
5
verified patient
24 Aug 2025

Dr Sirker inspires confidence, is professional and thorough - I am pleased to have him as my Consultant.

5
verified patient
23 Aug 2025

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.

5
verified patient
23 Aug 2025

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.

Patient seen for:
5
verified patient
23 Aug 2025

Very very good 👍

Patient seen for:
5
verified patient
21 Aug 2025

In all relevant respects “excellent” is the appropriate assessment.

5
verified patient
21 Aug 2025

Excellent, thorough and caring expert cardiologist. Very clear in his explanations of my condition and treatment.

Patient seen for:
5
verified patient
21 Aug 2025

Very clear and thorough medical advice

Patient seen for:
Your trust is our top concern, so providers can't pay to alter or remove reviews.
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Skill Endorsements

Dr Sirker is a leading cardiologist and expert in cardiovascular diseases. He is respected by colleagues, and well liked by patients.

29 Oct 2025
Endorsed for
Breathlessness
Cardiovascular Disease

Professor Prabhakar Rajan

Professor Prabhakar Rajan

Urologist
Is a colleague

Fantastic clinician with good patient rapport.

15 Sep 2025
Endorsed for
Coronary Artery Disease
Chest Pain

Prof. Thomas Treibel

Prof. Thomas Treibel

Cardiologist
Is a colleague

10 Jul 2024
Endorsed for
Coronary Artery Disease
Chest Pain

Dr Martin Lowe

Dr Martin Lowe

Cardiologist
Is a colleague

Highly recommended cardiologist with great feedback from patients.

11 Jun 2024
Endorsed for
Chest Pain
Coronary Artery Disease

Dr Rebecca Liu

Dr Rebecca Liu

Neurologist
Is a colleague

FAQ

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 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
See more locations

What are Dr Alexander Sirker working hours?

Dr Alexander Sirker is working Thursday (09:30 - 15:00)

Find where Dr Alexander Sirker operates today

Does Dr Alexander Sirker accept new patients?

Dr Alexander Sirker generally accepts new patients.

Get in touch with this specialist to enquire as a new patient