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Low Pulse (Bradycardia): Causes & Treatment
A low pulse (bradycardia) refers to a heart rate below 60 beats per minute. It can be harmless or may require medical treatment.
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A low pulse (bradycardia) refers to a heart rate below 60 beats per minute. It can be harmless or may require medical treatment.
What Is a Low Pulse?
A low pulse, medically known as bradycardia, occurs when the heart beats fewer than 60 times per minute. In healthy, well-trained athletes, a low resting pulse is completely normal and can even be a sign of excellent cardiovascular fitness. In other cases, however, bradycardia may indicate a heart condition or another underlying health problem and should be evaluated by a doctor.
Causes
The causes of a low pulse range from harmless to serious conditions:
- Athlete heart: Endurance athletes often have a resting pulse of 40–50 beats per minute because their heart pumps more efficiently due to training.
- Sick sinus syndrome: Dysfunction of the natural pacemaker of the heart can slow the heart rate.
- AV block: A blockage of the electrical conduction between the atria and ventricles leads to a slowed heart rate.
- Hypothyroidism: A deficiency of thyroid hormones slows many bodily functions, including the heartbeat.
- Medications: Certain drugs such as beta-blockers, calcium channel blockers, or cardiac glycosides can lower the pulse.
- Vagal reactions: Severe stress, pain, or vomiting can temporarily lower the pulse significantly via the vagus nerve.
- Electrolyte imbalances: Changes in potassium or calcium levels in the blood can affect heart rhythm.
- Heart attack or heart disease: Damage to heart tissue can impair the electrical conduction system.
Symptoms
A mildly low pulse may cause no symptoms at all. However, a very low pulse can lead to the following complaints:
- Dizziness and lightheadedness
- Fatigue and general weakness
- Shortness of breath, especially during physical activity
- Fainting or near-fainting episodes (pre-syncope)
- Chest pain or a feeling of tightness in the chest
- Difficulty concentrating and memory problems
Diagnosis
Diagnosing a low pulse involves several examination methods:
- Pulse measurement: The simplest method – manually at the wrist or neck, or via a pulse oximeter.
- Electrocardiogram (ECG): Records the electrical activity of the heart and detects rhythm disturbances.
- Holter monitor (24-hour ECG): Monitors heart rhythm over 24 to 48 hours to capture occasional episodes of bradycardia.
- Blood tests: Assessment of thyroid function, electrolytes, and other relevant parameters.
- Stress test (ergometry): Measures heart rate under physical exertion.
- Echocardiography: Ultrasound examination of the heart to assess its structure and function.
Treatment
Treatment depends on the underlying cause and the severity of the bradycardia:
- Watchful waiting: In asymptomatic bradycardia without a clear cause, especially in athletes, no treatment is usually necessary.
- Medication adjustment: If a drug is the cause, dose adjustment or switching to a different medication may be required.
- Treatment of the underlying condition: For example, treating hypothyroidism with thyroid hormone replacement therapy.
- Pacemaker implantation: In severe or symptomatic bradycardia that cannot be managed otherwise, a pacemaker is implanted. This small device sends electrical impulses to regulate the heartbeat.
- Emergency treatment: In acute, life-threatening bradycardia, medications such as atropine or adrenaline may be administered intravenously.
When to See a Doctor?
A low pulse should be evaluated by a doctor if it is accompanied by dizziness, fainting, chest pain, or shortness of breath. A resting pulse below 40 beats per minute without an athletic background also warrants prompt medical attention. In an emergency – such as loss of consciousness or severe chest pain – emergency services should be called immediately.
References
- Brignole M. et al. – 2021 ESC Guidelines on cardiac pacing and cardiac resynchronization therapy. European Heart Journal, 2021;42(35):3427–3520.
- Kasper D. L. et al. – Harrison's Principles of Internal Medicine. 20th Edition, McGraw-Hill Education, 2018.
- World Health Organization (WHO) – Cardiovascular diseases (CVDs). Fact Sheet, 2023. www.who.int
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