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First-degree heart block is a type of atrioventricular (AV) block, a condition in which the electrical signals between the atria (the upper chambers of the heart) and the ventricles (the lower chambers of the heart) are delayed. In first-degree heart block, the electrical signals are slowed down as they pass through the AV node, but all the signals eventually reach the ventricles.

Here are some key points about first-degree heart block:

*Causes:*
- *Age-Related Degeneration:* It is often seen in elderly individuals due to age-related degeneration of the heart's electrical conduction system.
- *Medications:* Certain medications, such as beta-blockers, calcium channel blockers, and antiarrhythmic drugs, can cause heart block.
- *Heart Disease:* Underlying heart conditions like myocardial infarction (heart attack) or myocarditis (inflammation of the heart muscle) can lead to heart block.
- *Electrolyte Imbalance:* Abnormal levels of potassium or other electrolytes in the blood can affect the heart's electrical conduction system.

*Symptoms:*
- *Asymptomatic:* First-degree heart block is often asymptomatic, meaning it does not cause noticeable symptoms in most cases.
- *Fatigue:* Some people might experience fatigue, especially during physical activity.

*Diagnosis:*
- *Electrocardiogram (ECG or EKG):* First-degree heart block can be diagnosed through an ECG, which shows a prolonged PR interval (the time interval between the P wave and the QRS complex).
- *Holter Monitor:* In some cases, a Holter monitor, which records the heart's activity over 24-48 hours, might be used to capture intermittent heart block episodes.

*Treatment:*
- *Monitoring:* If the heart block is asymptomatic, no specific treatment might be necessary. Regular monitoring of the condition is important.
- *Address Underlying Causes:* If the heart block is caused by medications or electrolyte imbalances, adjusting the medications or correcting the imbalance can improve the condition.
- *Pacemaker:* In rare cases where symptoms are severe and significantly affect the individual's quality of life, a pacemaker might be implanted to regulate the heart's rhythm.

It's important for individuals diagnosed with any degree of heart block to have regular follow-ups with a healthcare provider, as the condition can progress over time. Management and treatment decisions are made based on the underlying cause, the severity of symptoms, and the individual's overall health.