second-degree atrioventricular block

An atrioventricular block that is characterized by progressive prolongation of the PR interval on consecutive beats followed by a blocked P wave on electrocardiogram or intermittently non-conducted P waves not preceded by PR changes on electrocardiogram caused by a conduction block between the atria and the ventricles through the atrioventricular node.

first-degree atrioventricular block

An atrioventricular block that is characterized by prolonged PR interval on electrocardiogram caused by delayed conduction from atria to ventricles through the atrioventricular node.

rheumatic fever

A connective tissue disease that develops from an antecedent Group A Streptococcal pharyngeal infection and has_symptom carditis, has_symptom polyarthritis, has_symptom chorea, has_symptom erythema marginatum, has_symptom subcutaneous nodules, has_symptom arthralgia, has_symptom prolonged PR interval, and/or has_symptom fever.