Partial AV block where the PR interval increases progressively until there is an atrial impulse without a corresponding ventricular beat describes?

The description provided refers specifically to Mobitz type 1 AV block, also known as Wenckebach phenomenon. In this type of block, there is a progressive prolongation of the PR interval with each successive atrial impulse until a beat is dropped (i.e., an atrial impulse occurs without a corresponding ventricular response). This pattern distinguishes it from other forms of AV block.

The progressive nature of the PR interval lengthening is a hallmark for Mobitz type 1, making it a key characteristic to recognize in arrhythmias. Following the dropped beat, the cycle resets, and the PR interval may start the cycle of prolongation anew. This unique sequence is what identifies it clearly and sets it apart from other types of AV block.

In contrast, Mobitz type 2 involves a sudden drop of beats without the progressive increase in PR intervals, while first-degree AV block features a prolonged PR interval that is consistent and does not exhibit the aforementioned pattern of elongation and drop. Complete heart block denotes a failure of impulses to reach the ventricles, leading to a dissociation between atrial and ventricular activity without predictable dropped beats as seen in Mobitz type 1. Thus, the characteristics of Mobitz type 1 directly align with the provided scenario