Understanding Bradycardia, When Your Heart Beats Too Slowly
- Jun 9
- 6 min read
Clinical insight from Dr Paul Lim of The Heart Specialist Clinic. Watch his full interview on FindClinic.sg.
It often shows up in unexpected ways. A reading on your smartwatch that flags your resting heart rate as unusually low. A moment of light-headedness when you stand up too quickly. A nurse mentioning during a routine check that your pulse is slower than expected.
Your first reaction may be confusion. A slower heart rate sounds harmless. Some people associate it with being fit, others with being calm. So why does this number suddenly feel like a question instead of a reassurance?
If you have been searching for answers about bradycardia in Singapore, you are not alone in trying to make sense of what your heart rate may be telling you. Bradycardia simply means a slower than usual heart rate, and while it is sometimes a sign of good health, it can also point to a heart rhythm issue that benefits from proper assessment.
At The Heart Specialist Clinic (THSC) in Mount Elizabeth Medical Centre, Dr Paul Lim sees patients with heart rhythm concerns, including bradycardia, as part of his focus on electrophysiology and cardiac pacing.
What is bradycardia?
Bradycardia is the medical term for a slow heart rate. In adults, this generally means a resting heart rate below 60 beats per minute.
A slow heart rate is not always a problem. For some people, particularly athletes and those who exercise regularly, a low resting heart rate reflects an efficient cardiovascular system. The heart simply does not need to beat as often to do its job.
For others, bradycardia can indicate that the heart's electrical system is not working as well as it should. When the heart beats too slowly to meet the body's needs, less oxygen reaches the brain, muscles, and organs. This can produce symptoms that range from mildly uncomfortable to seriously concerning.
The key question is not the number itself, but what it means in the context of your overall health.
Common symptoms of bradycardia
Some people with bradycardia have no symptoms at all. When symptoms do appear, they may include:
Fatigue that does not improve with rest
Dizziness or light-headedness, particularly when standing
Shortness of breath, especially during light activity
Fainting or near-fainting episodes
Confusion or memory difficulties, especially in older adults
Chest discomfort during exertion
Reduced exercise tolerance
A feeling that the heart is skipping or pausing
These symptoms can come and go, which is one reason bradycardia sometimes goes undiagnosed for a long time.
Common causes of bradycardia
Bradycardia can be caused by a range of factors, some natural, some related to underlying health conditions, and some related to medications.
Age-related changes to the heart's electrical system, which become more common after 65
Sick sinus syndrome, where the heart's natural pacemaker functions less reliably
Heart block, where electrical signals are slowed or interrupted between the upper and lower chambers
Previous heart attack that has affected the conduction system
Hypothyroidism, where an underactive thyroid slows many body processes
Certain medications, including beta blockers, calcium channel blockers, and some heart rhythm drugs
Electrolyte imbalances, particularly involving potassium and calcium
Sleep apnea, which can place repeated strain on the heart
Increased vagal tone, sometimes seen in young athletes
Inherited conduction disorders in rarer cases
Identifying the cause is the most important step, because it shapes the entire treatment plan.
How bradycardia is diagnosed
A proper assessment looks at both the heart rate and the bigger clinical picture.
Common steps include:
Medical history and symptom review, including medications and lifestyle
Physical examination, including pulse and blood pressure
Electrocardiogram (ECG) to record the heart's electrical activity at rest
Ambulatory monitoring such as a 24-hour Holter monitor or a longer-term loop recorder, which can catch episodes the resting ECG misses
Echocardiogram to assess the structure and function of the heart
Blood tests, including thyroid function and electrolyte levels
Exercise stress test in selected cases to see how the heart responds to activity
Because bradycardia can come and go, ambulatory monitoring is often the most useful single test. It records what is actually happening across days, not just minutes.
How bradycardia is treated
Treatment depends entirely on the underlying cause and whether the slow heart rate is producing symptoms.
For some patients, no treatment is needed. A low resting heart rate in a fit, asymptomatic person is often simply a healthy heart adaptation.
For others, treatment options may include:
Reviewing and adjusting medications that may be slowing the heart rate
Treating underlying conditions such as hypothyroidism or sleep apnea
Correcting electrolyte imbalances through diet or medication
Lifestyle adjustments including hydration, regular movement, and avoiding excessive vagal triggers
A pacemaker for patients with persistent, symptomatic bradycardia that cannot be reversed by addressing other causes
Pacemakers have become smaller, smarter, and more reliable over the years. For patients who need one, they often restore energy and quality of life in a way that surprises both the patient and their family.
When to see a cardiologist about bradycardia
You may want to consider a consultation if:
You have noticed a persistently low heart rate alongside symptoms such as fatigue, dizziness, or fainting
A smartwatch or fitness tracker has flagged unusual heart rate readings
You have experienced unexplained near-fainting or fainting episodes
You take medications that can slow the heart and have new symptoms
You have a known thyroid condition and now notice cardiac symptoms
A previous ECG has shown signs of conduction slowing
A cardiologist with experience in heart rhythm conditions can take a careful look at the full picture and recommend the right next steps.
Frequently Asked Questions
What is a normal heart rate?
For adults, a normal resting heart rate is generally between 60 and 100 beats per minute. Fit individuals may have a lower resting rate, while certain medications and conditions can also alter it.
When is a slow heart rate dangerous?
A slow heart rate becomes concerning when it produces symptoms such as fatigue, dizziness, fainting, shortness of breath, or chest discomfort. A slow rate without symptoms is often not dangerous, but still worth a proper assessment.
Can bradycardia be cured?
Some causes of bradycardia can be reversed, such as adjusting medications, treating thyroid problems, or correcting electrolyte imbalances. Other cases, particularly age-related changes to the heart's conduction system, may require ongoing management or a pacemaker.
Does bradycardia always need a pacemaker?
No. Pacemakers are reserved for patients with persistent, symptomatic bradycardia where other treatments have not resolved the issue. Many cases do not need one.
Can athletes have bradycardia?
Yes. A low resting heart rate is common in trained athletes and reflects efficient cardiovascular fitness. In athletes without symptoms, this is usually a healthy finding.
Is bradycardia hereditary?
Most cases of bradycardia are not directly inherited, but certain inherited conduction disorders can cause it. A family history of pacemaker use, early cardiac issues, or sudden cardiac events is worth mentioning to your cardiologist.
Meet Dr Paul Lim
A slow heart rate is one of those findings that may mean very little, or may mean something worth attending to. The only way to know is a proper assessment.
Dr Paul Lim is a Consultant Cardiologist at The Heart Specialist Clinic (THSC) in Mount Elizabeth Medical Centre and Parkway East Medical Centre. With a clinical focus on electrophysiology and cardiac pacing, he cares for patients with heart rhythm conditions including bradycardia, arrhythmias, and those who may benefit from pacemaker therapy.
Dr Lim is also featured on FindClinic.sg, Singapore's healthcare editorial discovery platform that connects patients with verified specialist doctors through profiles, articles, and video interviews.
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Read Dr Paul Lim's full profile and video interview on FindClinic.sg
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When you are ready
A consultation is a conversation. You bring your concerns, your heart rate readings if you have them, and the symptoms you have noticed. Dr Lim brings the time, expertise, and rhythm-focused perspective to help you understand what is happening.
To book a consultation with Dr Paul Lim at The Heart Specialist Clinic, call +65 6235 8733 or fill in the booking form.