What condition is associated with bradycardia and an extended PR interval?

The condition associated with bradycardia and an extended PR interval is best understood through the effects of atrioventricular (AV) nodal conduction. In the presence of hyperkalemia, elevated potassium levels can lead to conduction system disturbances, particularly affecting the AV node. This can result in slower conduction times, leading to a bradycardia presentation and a lengthened PR interval on an ECG.

Hyperkalemia causes a decrease in the resting membrane potential, which can slow down the depolarization process in cardiac tissues, especially within the AV node. As a result, both bradycardia and an extended PR interval are typical findings in this situation, linking hyperkalemia with distinct changes in cardiac rhythm and conduction.

Other options may present with bradycardia but do not uniquely characterize the combination of bradycardia with an extended PR interval as seen in hyperkalemia.