Doctify logo
For providers
Provider Login

Dr Alexander Sirker

MA (Cantab), MB BChir, FRCP, PhD

Cardiologist

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

4.96

/5

(37 reviews)

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

All
Reviews
Skill Endorsements
Coronary Artery Disease
15
3
Coronary Stent Insertion
9
2
Breathlessness
8
1

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
(74)
Skill Endorsements
(25)

Click the bar to read reviews or skill endorsements

Coronary Artery Disease
15
3
Coronary Stent Insertion
9
2
Breathlessness
8
1
CT Coronary Angiogram
6
Chest Pain
5
3
High Blood Pressure (Hypertension)
5
Exercise Stress Test
5
Cardiovascular Disease
3
5
ECG (Electrocardiogram)
3
Heart Attack
3
Coronary Angiography
2
3
Valvular Heart Disease
2
Echocardiogram (Cardiac Ultrasound)
2
Angioplasty
1
Angina
1
Palpitations
1
Heart Valve Problems
1
Heart Scan
1
Mitral Valve Regurgitation
1
Percutaneous Coronary Intervention (PCI)
3
Cardiovascular Disease Prevention
2
Stress Echocardiogram
1
Dobutamine Stress Echocardiogram
1
Complex Coronary Interventions
1
Unstable Angina
Heart Muscle Disease
24 Hour Blood Pressure Monitor
Cardioversion
Pressure Wire Study (Coronary Angiography)
Cardiac Shock Wave Therapy (CSWT)
ECG Holter Monitor
Rotablation (Coronary Arteries)
Calcium Coronary Score
Intravascular Ultrasound
Acute Coronary Syndrome (ACS)
Atherosclerosis
Loss of Consciousness
Heart Murmurs

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

    £275
  • Follow-up appointment

    £225
*May vary on location

Locations

HCA Healthcare UK The Harley Street Clinic

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

4.75(3,384 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(3,229 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(1,644 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(572 reviews)

Opening hours

Monday - Friday
Saturday
Sunday

The Physicians' Clinic London

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

4.87(475 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
15
3
Coronary Stent Insertion
9
2
Breathlessness
8
1

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.

4.67
verified patient
28 Oct 2026

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.

5
verified patient
27 Oct 2026

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.

Patient seen for:
5
verified patient
27 Oct 2026

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.

5
verified patient
27 Oct 2026

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.

Patient seen for:
5
verified patient
21 Oct 2026

Dr Sirker is a highly skilled professional and very thorough. He is courteous and efficient (as is his PA).

5
verified patient
20 Oct 2026

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.

5
verified patient
19 Oct 2026

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.

5
verified patient
19 Oct 2026

My visits to Dr.Sirker have always been marked by his courtesy and efficiency. I have complete trust in his judgement.

5
verified patient
19 Oct 2026

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..

5
verified patient
19 Oct 2026

Dr Sirker was kind and very thorough. As always.

Your trust is our top concern, so providers can't pay to alter or remove reviews.
Learn more here

Skill Endorsements

Alex is great cardiologist. Very professional with excellent patient feedback.

26 Oct 2026
Endorsed for
Cardiovascular Disease
Cardiovascular Disease Prevention

Professor Howard Branley

Professor Howard Branley

Respiratory Doctor
I have referred patients to them

Dr 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
Endorsed for
Cardiovascular Disease
Coronary Angiography
Percutaneous Coronary Intervention (PCI)

Dr Bhavik Modi

Dr Bhavik Modi

Cardiologist
Is a colleague

Safe and very capable operator

26 Oct 2026
Endorsed for
Percutaneous Coronary Intervention (PCI)
Coronary Angiography

Dr Sam Firoozi

Dr Sam Firoozi

Cardiologist
Is a colleague

Alex was one of the smartest guys in my year at Cambridge. No surprise that he's also a very good Cardiologist...

26 Oct 2026
Endorsed for
Cardiovascular Disease
Cardiovascular Disease Prevention

Professor Luke Howard

Professor Luke Howard

Respiratory Doctor
We trained together

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 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
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