Bradycardia

Definition

Bradycardia is a condition where a person has a slower than normal heart rate, usually fewer than 60 beats per minute in adults.

Scientific / Technical Definition

Bradycardia is a cardiac arrhythmia with a heart rate less than 60 beats per minute. It can occur in both physiological and pathological forms, and although it may be normal in well-trained athletes, it can be a sign of underlying health issues such as heart disease, hypothyroidism, or imbalance in electrolytes.

Benefits

• Improved cardiac efficiency due to the heart being adequately conditioned, often seen in athletes.
• Possible extended lifespan as a result of reduced cardiac workload.

Examples

• Bradycardia caused by electrolyte imbalances (low potassium or high calcium levels).
• Increased efficacy of the vagal tone leading to a slower heart rate.

Additional Information

• Side effects: Bradycardia can cause dizziness, fatigue, shortness of breath, or chest pain and may require medical intervention if it becomes symptomatic.

Related Terms

• Tachycardia
• Heart Rate
• Arrhythmia
• Electrolytes

References

• Bradycardia Overview
• Bradycardia: Causes and Treatments