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Nov ,  · A delay in conduction in this system results in an atrioventricular conduction block or a prolongation of the PR interval on ECG Conduction blocks are classified as either firstdegree block, seconddegree block, or thirddegree block The seconddegree atrioventricular block is the focus of this activityC Sinus rhythm, 1st degree AV Block, and a Premature Atrial Contraction with Aberrant Conduction d Sinus Rhythm with 1st Degree AV Block and a PVC e Sinus Tachycardia with 1st Degree AV Block and a PACFirstdegree AV block refers to a condition where the transmission of impulses through the AV node is slower than expected First degree AV block is usually diagnosed incidentally on an electrocardiogram The typical finding is a prolonged PR interval The PR interval simply measures the time it takes for electricity to move through the atrium Case B4 First Degree Av Block St Emlyn S Ecg Library St Emlyn S First degree sinus rhythm with 1st degree av block