Dr Lim

  • Arrhythmia
  • Atrial Fibrillation
  • Cardiac ablation
  • Implantable cardioverter defibrillator (ICD)
  • Pacemaker
  • Syncope

Dr Boon Lim

GMC: 4767042

Dr Boon Lim is one of London's leading cardiologists and electrophysiologists. He specialises in heart rhythm disturbances, pacing and syncope at Imperial College and at his Harley Street clinic. He leads the established Imperial Syncope Diagnostic Service at Hammersmith Hospital and is frequently invited to national and international meetings to share his experience. He has a special interest in the mapping and ablation of atrial fibrillation (AF) and is highly-skilled at using modern 3-D mapping technologies. Dr Lim was awarded several prestigious prizes during his medical training at Cambridge University where he obtained a double First Class Honours Degree. He has continued his passion for education and research serving as an Honorary Senior Lecturer at Imperial College where he supervises several PhD students.

Dr Lim is very actively engaged in all aspects of research with a particular interest in developing the best techniques for treating atrial fibrillation. He is invited to speak both nationally and internationally to discuss his findings and to teach other physicians about the best techniques for complex mapping and ablation of atrial fibrillation and other complex arrhythmias. He leads a very active syncope research team based at the Imperial Syncope Diagnostic Unit and is looking to improve healthcare delivery for patients through use of effective online education to help improve the quality of life for patients across the UK. 


 Diseases, Medical Tests and Treatments

  • Arrhythmia
  • Atherosclerosis
  • Atrial Fibrillation
  • Blood pressure test
  • Brugada syndrome
  • Cardiac ablation
  • Cardiovascular disease
  • Catheter
  • Chest pain
  • Cholesterol
  • Diabetes
  • Dilated cardiomyopathy
  • Echocardiogram
  • Electrocardiogram
  • Electrophysiology study
  • Extrasystole
  • Heart failure
  • Heart murmur
  • Heart valve replacement
  • Hereditary diseases
  • Hypercholesterolemia
  • Hypertension
  • Hypertrophic Cardiomyopathy
  • Implantable cardioverter defibrillator (ICD)
  • Lipid disorders
  • Mitral regurgitation
  • Myocarditis
  • Pacemaker
  • Palpitations
  • Second medical opinion
  • Stress test
  • Stroke
  • Sudden death
  • Supraventricular tachycardia
  • Syncope
  • Tilt table
  • Valvular heart disease
  • Ventricular tachycardia

Make an appointment


  • London Cardiovascular Clinic
    66 Harley St W1G 7HD - London (Central London)
    (+44) 02078989984
  • BMI Syon Clinic
    941 Great West Rd TW8 9DU - London (West London)
    (+44) 02078989984
  • Imperial Private Healthcare
    Hammersmith Hospital, Du Cane Rd, White City W12 0HS - London (West London)
    (+44) 02078989984


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Atrial flutter: your comprehensive guide

The human heart usually has a steady rhythm. However, problems can occur if it starts to beat too quickly. Atrial flutter is the sensation of rapid heartbeats and here, leading cardiologist Dr Boon Lim guides you through what this condition is, why it requires treatment, the success rates of treatment and more.

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Are ectopic heartbeats dangerous?

Many of us experience ectopic heartbeats without any cause for concern, but when are they considered dangerous? Dr Boon Lim explains all you need to know about these abnormal heartbeats and when to seek medical help.

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5 ways to stop yourself from fainting

Sometimes we have to do things that make us feel faint – getting on a crowded train, giving blood, or speaking in public. Knowing how to stop that feeling in its tracks and prevent a full-blown fainting episode can be extremely empowering. The good news is that there are simple things everyone can do to stop themselves from fainting – as consultant cardiologist and fainting world expert Dr Boon Lim explains:

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Why do I faint on the London Underground?

The London Underground is a difficult place to be at the best of times – but it can turn into a nightmare if you’re not feeling your best. But what causes people to actually faint on the tube? It’s a classic case of reflex syncope – according to Dr Boon Lim, consultant cardiologist at the London Cardiovascular Clinic in Harley Street, London.

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Can anxiety really have an effect on our heart?

Dr Boon Lim is a renowned cardiologist and expert in the diagnosis and treatment of arrhythmias. He recently presented at the 2018 Heart Rhythm Congress in Birmingham, which is the largest meeting of heart rhythm specialists in the UK. Here he presented on several topics, including the fascinating link between arrhythmia (specifically ectopic beats) and anxiety.

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Can you really monitor your heart with your watch?

As mankind races into the future, our technology keeps leaping forward. Innovations like the Apple Watch and Fitbit feature heart rate monitors attached to our wrists, which not only allow us to keep an eye on our fitness, but also open up the possibility of using watches to help spot issues with heart health. Expert cardiologist Dr Boon Lim is here to explain:

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Obstructive sleep apnoea and the heart

Do you ever feel more tired after sleeping? If this happens a lot, it may be more than simply a bad night’s sleep. What’s more, obstructive sleep apnoea can have knock-on effects on your mental state and even your heart. Top cardiologist Dr Boon Lim explains.

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Top 7 tips on visiting your doctor about fainting

Syncope (pronounced sin-cope-pee), also known as fainting, blacking out or passing out, can be a worrying problem. London-based cardiologist and syncope expert Dr Boon Lim, who leads the renowned Imperial Syncope Diagnostic Unit at Hammersmith Hospital gave us his top tips for what to record and tell your doctor about episodes of fainting.

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What causes fainting?

Syncope is the medical term for fainting, blacking out, or loss of consciousness. Many people have experienced this phenomenon, passing out in a crowd, or on public transport. But why does this happen to certain people? Dr Boon Lim, a leading London cardiologist and expert on syncope explains what causes fainting

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Swallow syncope - what causes fainting after swallowing?

There are many different types of syncope (fainting, passing out, blacking out), and while some are common, there are also rarer forms. Here, Dr Boon Lim, consultant cardiologist and expert in syncope, explains swallowing syncope, and how it can be managed.

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Feeling faint – 5 top tips to help with syncope

You may know someone who has lost consciousness in a crowded place or blacked out while having an injection; perhaps it has happened to you. Why are some people prone to fainting? And what can you do to prevent it? Leading cardiologist Dr Boon Lim gave us his five top tips to help with syncope.

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What is situational syncope? Causes, diagnosis and treatment explained

It is estimated that syncope, or fainting, in some form affects 1 in 3 individuals at some stage in their life. In this article, leading cardiologist and expert in syncope, Dr Boon Lim, talks us through what causes some people to faint as a result of weightlifting, swallowing, coughing, and other specific triggers.

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  • Clearly an expert in his field with a very personable and respectful communication style. Would highly recommend
  • Dr Lim attended to details and shown interest on the general well being of patient. His cheerful and encouraging tone made one felt much better instantly
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