PMC7334591_01
Representative EKGs.. A) Day one EKG with first-degree atrioventricular (AV) block, as well as early repolarization with J-point elevations in several leads. B) Day two EKG with normalized PR interval to 170 ms with sinus bradycardia.
gr1.jpg
PMC7334591_01_gr1.jpg
f0005
EKG on admission revealed prolonged PR interval (214 ms; normal PR interval is 120-200 ms) with first-degree AV block, as well as early repolarization with J-point elevations in several leads (Fig. 1A). Day two EKG showed normalized PR interval to 170 ms with sinus bradycardia (Fig. 1B).
Day four representative telemetry tracing showing second degree, Mobitz type 1 AV block (Wenckebach).
gr2.jpg
PMC7334591_01_gr2.jpg
f0010
Over the course of the evening, telemetry revealed frequent second degree, Mobitz type 1 AV block (Wenckebach), defined by progressively lengthening PR interval and ultimately, the P wave is not conducted, in contrast to Mobitz type 2 AV block in which dropped beats occur sporadically without antecedent progressive PR prolongation (Fig. 2).