Bradycardia
Bradycardia is a heart rhythm condition in which the heart beats more slowly than expected. A slow heart rate is not always a medical problem. It can be normal in some healthy people, particularly during sleep or in physically active individuals. However, bradycardia can cause symptoms when the heart rate is too slow to provide adequate blood flow to the body.
At DHEE Hospitals Cardiology, bradycardia is evaluated by identifying its underlying cause, assessing symptoms, and determining whether treatment is required.
What Is Bradycardia?
In adults, a resting heart rate below 60 beats per minute is generally described as bradycardia. However, the heart rate alone does not determine whether treatment is necessary.
Some people with a slow heart rate have no symptoms and require only observation. Others may develop symptoms because the heart is not beating fast enough to maintain adequate blood flow.
Symptoms of Bradycardia
When bradycardia affects the heart’s ability to pump sufficient blood, symptoms may include:
- Fatigue or unusual tiredness
- Dizziness or light-headedness
- Fainting or near-fainting
- Shortness of breath
- Reduced ability to exercise
- Weakness
- Confusion or difficulty concentrating
- Chest discomfort in some cases
Causes of Bradycardia
Bradycardia can result from problems with the heart’s natural pacemaker or electrical conduction system. Possible causes include:
- Age-related changes in the heart’s electrical system
- Heart disease
- Previous heart attack
- Heart surgery
- Heart block
- Problems with the sinus node
- Underactive thyroid
- Electrolyte abnormalities
- Sleep-related breathing disorders
- Certain medicines
Sinus Bradycardia
Sinus bradycardia occurs when the heart’s natural pacemaker, the sinus node, generates electrical impulses at a slower rate. It can be normal in some people, particularly during sleep or in well-trained athletes.
When sinus bradycardia causes significant symptoms or results from an underlying problem, further evaluation may be required.
Bradycardia and Heart Block
Heart block occurs when electrical signals travelling through the heart’s conduction system are delayed or blocked. Some types of heart block can cause a slow heart rate and may require treatment.
The severity of heart block varies. The appropriate treatment depends on the specific type of conduction abnormality and whether symptoms or other cardiac problems are present.
How Is Bradycardia Diagnosed?
Electrocardiogram
An ECG records the heart’s electrical activity and can determine the heart rate and rhythm. It can also help identify conduction abnormalities and different types of heart block.
Holter Monitoring
A Holter monitor continuously records the heart rhythm, usually for 24 hours or longer. It can help identify episodes of slow heart rate that may not occur during a routine ECG.
Extended Rhythm Monitoring
If symptoms occur infrequently, longer-term monitoring may be recommended to determine whether symptoms are associated with episodes of bradycardia.
Blood Tests
Blood tests may be used to check for conditions such as thyroid disorders or electrolyte abnormalities that can contribute to a slow heart rate.
Echocardiogram
An echocardiogram may be recommended to evaluate the structure and function of the heart and identify underlying heart disease.
Bradycardia Treatment
Treatment depends on the cause, severity, symptoms, and overall health of the patient. Some people with asymptomatic bradycardia may not need specific treatment.
Review of Medicines
Certain medicines can slow the heart rate. If medication is contributing to bradycardia, the cardiologist may review the medicines and adjust treatment when appropriate.
Treatment of Underlying Conditions
Bradycardia caused by conditions such as thyroid disorders or electrolyte abnormalities may improve when the underlying problem is treated.
Pacemaker
A pacemaker may be recommended for selected patients with persistent symptomatic bradycardia or certain types of heart block. The device helps maintain an appropriate heart rate by providing electrical stimulation when the heart’s natural rhythm is too slow.
When Is a Pacemaker Needed?
A pacemaker is not required simply because a person’s heart rate is below 60 beats per minute. The decision depends on factors such as symptoms, the type of electrical abnormality, the relationship between symptoms and the slow heart rate, and the risk associated with the rhythm disorder.
A cardiologist evaluates these factors before recommending pacemaker implantation.
When Should You Seek Medical Attention?
Seek urgent medical attention if a slow heartbeat is accompanied by fainting, severe dizziness, chest pain, severe shortness of breath, confusion, or significant weakness.
Sudden loss of consciousness or severe symptoms require emergency medical assessment.
Can Bradycardia Be Prevented?
Not all cases of bradycardia can be prevented because some are related to natural ageing or changes in the heart’s electrical system. However, maintaining cardiovascular health and managing underlying medical conditions can help reduce the risk of some heart rhythm problems.
- Control blood pressure and cholesterol.
- Manage diabetes effectively.
- Avoid smoking.
- Maintain a healthy body weight.
- Follow treatment for existing heart disease.
- Take medicines only as prescribed.
- Attend regular medical follow-up when recommended.
Bradycardia Care at DHEE Hospitals Cardiology
DHEE Hospitals Cardiology provides evaluation and management for patients experiencing slow heart rates, dizziness, fainting, fatigue, and other symptoms that may be associated with bradycardia.
Depending on the patient’s symptoms and medical history, evaluation may include ECG, Holter monitoring, extended rhythm monitoring, echocardiography, blood tests, and other cardiac investigations. Treatment is based on the underlying cause and individual clinical needs.
Frequently Asked Questions About Bradycardia
Is a heart rate below 60 dangerous?
Not necessarily. A heart rate below 60 beats per minute can be normal in some healthy people, especially during sleep or in physically active individuals. Symptoms and the underlying cause are important in determining whether treatment is needed.
Can bradycardia cause fainting?
Yes. If the heart rate becomes too slow to maintain adequate blood flow to the brain, it can cause dizziness, near-fainting, or fainting.
Can medicines cause bradycardia?
Yes. Some medicines can slow the heart rate. A doctor should review the medication list when bradycardia develops, but prescribed medicines should not be stopped without medical advice.
Does everyone with bradycardia need a pacemaker?
No. Many people with a slow heart rate do not need a pacemaker. Pacemaker treatment is considered when there is an appropriate clinical indication, such as certain symptomatic slow rhythms or conduction disorders.
Can bradycardia be temporary?
Yes. Bradycardia can sometimes occur temporarily due to medicines, metabolic abnormalities, or other reversible conditions. Identifying and treating the underlying cause may restore the heart rate.
