Final answer:
First-degree atrioventricular block is a heart condition with delayed electrical conduction, recognizable by an extended PR interval on ECG. It's often asymptomatic and treatment focuses on monitoring and addressing the underlying cause rather than the block itself.
Step-by-step explanation:
Understanding AV Block and Its Treatment
A first-degree atrioventricular block (AVB) is a type of heart conduction disorder where there is a delay in the electrical signal between the sinoatrial (SA) node and the atrioventricular (AV) node. This condition can be identified on an electrocardiogram (ECG) by an abnormally long PR interval. While first-degree AV block is usually asymptomatic, it can be caused by various factors including drug therapy with negative inotropic agents like digoxin, beta-adrenergic blockers or calcium channel blockers, post-myocardial infarction (MI), degenerative disease of the conduction system, electrolyte imbalances like hypo- or hyperkalemia, and increased vagal tone.
Treatment typically involves observing the patient for progression of the condition and managing the underlying cause rather than the AV block itself. In some cases, medications such as digoxin and amiodarone, which can slow A-V conduction, may need to be held, especially if the PR interval is lengthening. Consulting with a physician is crucial for appropriate management of the condition.