A slow heart rate, or bradycardia, occurs when the heart beats fewer than 60 times per minute. This can result from medical conditions, medications, or lifestyle factors.
The heart's natural pacemaker, the sinoatrial (SA) node, controls heart rate. Bradycardia happens when the SA node fires too slowly or when signals between the heart's chambers are blocked. The heart may not pump enough blood to meet the body's needs, leading to symptoms like fatigue, dizziness, or fainting.
Bradycardia can be classified into different types based on its underlying cause:
| Type | Cause |
|---|---|
| Sinus node dysfunction | The SA node doesn't work properly, often due to aging or coronary artery disease. |
| Heart block | Electrical signals are delayed or blocked as they travel through the heart's electrical system. |
| Medications | Certain drugs, such as beta-blockers or calcium channel blockers, can slow the heart rate. |
Bradycardia is often confused with tachycardia, which is an abnormally fast heart rate. While both can cause similar symptoms like palpitations or dizziness, their causes and treatments differ.
If you experience symptoms like extreme fatigue, fainting, or chest pain along with a slow heart rate, seek medical attention immediately. A doctor can diagnose the underlying cause using tests like an electrocardiogram (ECG) or Holter monitor.
Treatment options depend on the cause. For example, if medication is the culprit, your doctor may adjust the dosage. In cases of sinus node dysfunction or heart block, a pacemaker may be recommended.
Last winter, I noticed my heart rate was consistently below 50 beats per minute during morning workouts. After consulting a doctor, I was diagnosed with mild sinus bradycardia, likely due to intense training. Adjusting my exercise routine helped normalize my heart rate.