Bradycardia

Definition

Bradycardia is a slower than normal heart rate, typically defined as fewer than 60 beats per minute in adults. It can be a sign of an underlying health issue or a side effect of certain medications.

5 Must Know Facts For Your Next Test

1. Bradycardia can result from problems with the heart's electrical system, including the sinoatrial node.
2. Common symptoms include dizziness, fatigue, and shortness of breath.
3. Certain medications, such as beta-blockers and calcium channel blockers, can cause bradycardia.
4. It can be treated with lifestyle changes, medication adjustments, or pacemaker implantation depending on the severity and underlying cause.
5. Athletes often have lower resting heart rates due to their high cardiovascular fitness levels and may experience bradycardia without any adverse effects.

Review Questions

• What are common symptoms associated with bradycardia?
• Which types of medication can lead to bradycardia?
• How is severe bradycardia typically treated?

Related terms

Tachycardia:

An abnormally fast heart rate, usually defined as over 100 beats per minute in adults.

Sinoatrial Node:

The natural pacemaker of the heart that regulates heartbeat by generating electrical impulses.

Antidysrhythmic Drugs:

Medications used to treat abnormal heart rhythms by modifying the electrical activity of the heart.