What Is Sinus Bradycardia?

Sinus bradycardia is a slower-than-normal heartbeat that starts in the heart’s natural pacemaker, called the sinoatrial (SA) node. In adults, it usually means the heart beats fewer than 60 times per minute while at rest.

Several factors can contribute to sinus bradycardia, including:

• Aging-related changes in the heart
• Heart disease or prior heart attack
• Sleep apnea
• Hypothyroidism
• Certain medications, including beta-blockers
• High endurance athletic training
• High blood pressure or diabetes

For some people, a slow heart rate is normal and healthy, especially during sleep or in well-trained athletes. In other cases, sinus bradycardia may be linked to an underlying medical condition or changes in the heart’s electrical system.

Symptoms

Many people with sinus bradycardia do not notice any symptoms. Others may develop symptoms when the heart is unable to pump enough blood to meet the body’s needs.

Symptoms may include:

• Fatigue or low energy
• Dizziness or lightheadedness
• Fainting
• Shortness of breath
• Reduced ability to exercise
• Chest discomfort

How Is It Diagnosed?

Healthcare providers diagnose sinus bradycardia using a physical exam, medical history, and heart rhythm testing. An electrocardiogram (ECG) is commonly used to measure the heart’s electrical activity and confirm a slow rhythm.

Additional testing may include:

• Holter or event monitoring
• Blood tests
• Exercise stress testing
• Sleep studies
• Other heart rhythm evaluations when needed

These tests help identify possible underlying causes and determine whether treatment is necessary.

How Is It Treated?

Treatment depends on whether symptoms are present and what is causing the slow heart rate. Many people do not need treatment if the condition is mild and not causing problems.

Treatment options may include:

• Monitoring heart rhythm over time
• Treating underlying conditions such as thyroid disease or sleep apnea
• Adjusting medications that slow the heart rate
• Heart-healthy lifestyle changes
• Pacemaker placement in more severe cases

With proper care, many people manage sinus bradycardia successfully and continue normal daily activities.What Is Sinus Bradycardia?

Sinus bradycardia is a slower-than-normal heartbeat that starts in the heart’s natural pacemaker, called the sinoatrial (SA) node. In adults, it usually means the heart beats fewer than 60 times per minute while at rest.

Several factors can contribute to sinus bradycardia, including:

• Aging-related changes in the heart
• Heart disease or prior heart attack
• Sleep apnea
• Hypothyroidism
• Certain medications, including beta-blockers
• High endurance athletic training
• High blood pressure or diabetes

For some people, a slow heart rate is normal and healthy, especially during sleep or in well-trained athletes. In other cases, sinus bradycardia may be linked to an underlying medical condition or changes in the heart’s electrical system.

Symptoms

Many people with sinus bradycardia do not notice any symptoms. Others may develop symptoms when the heart is unable to pump enough blood to meet the body’s needs.

Symptoms may include:

• Fatigue or low energy
• Dizziness or lightheadedness
• Fainting
• Shortness of breath
• Reduced ability to exercise
• Chest discomfort

How Is It Diagnosed?

Healthcare providers diagnose sinus bradycardia using a physical exam, medical history, and heart rhythm testing. An electrocardiogram (ECG) is commonly used to measure the heart’s electrical activity and confirm a slow rhythm.

Additional testing may include:

• Holter or event monitoring
• Blood tests
• Exercise stress testing
• Sleep studies
• Other heart rhythm evaluations when needed

These tests help identify possible underlying causes and determine whether treatment is necessary.

How Is It Treated?

Treatment depends on whether symptoms are present and what is causing the slow heart rate. Many people do not need treatment if the condition is mild and not causing problems.

Treatment options may include:

• Monitoring heart rhythm over time
• Treating underlying conditions such as thyroid disease or sleep apnea
• Adjusting medications that slow the heart rate
• Heart-healthy lifestyle changes
• Pacemaker placement in more severe cases

With proper care, many people manage sinus bradycardia successfully and continue normal daily activities.