At a glance this appears to be a complicated case, but it is not. Let's take 1 beat at a time. First let's pick the beat that seems to have a normal PR relationship: P3. Let's assume that P3 is ...
Figure 1 shows straightforward type I (second-degree) AV block. The QRS complexes do not occur regularly, which immediately rules out third-degree AV block, because in third-degree AV block the escape ...
An electrocardiogram (Fig. 1) of the Case Records of the Massachusetts General Hospital (in the September 18 issue) needs a few comments or corrections. First of all, the entire tracing in Figure 1 is ...
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