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. 2016 Nov 2;3(2):115–119. doi: 10.1016/j.hrcr.2016.08.006

Figure 1.

Figure 1

Electrocardiograms (ECGs). A: ECG from October 2015 with 3:2 AV block. Initially, conducted QRS complexes are narrow with relatively short PR intervals. With subsequent conducted beats, there is slight PR prolongation and a change of QRS morphology to right bundle branch block. B: ECG from January 2016 with initial 2:1 AV block followed by 1:1 AV conduction. The first 3 QRS complexes are narrow. During 1:1 AV conduction, the first QRS complex is narrow and subsequent QRS complexes widen. PR slightly prolongs between the first and second conducted QRS complex and then remains constant.