Comment on the diagnosis of the ECG tracing shown below.
First degree AV block, intranodal
Second degree AV block type1, intranodal
Second degree AV block type 2, infranodal
Third degree AV block
Symmetry in PR interval before and after the missed beat --> Indicating Second degree AV block type 2: infranodal. In Second degree AV block type 1 --> Serial lengthening of PR interval before and after the missed beat. In Third degree AV block --> complete dissociation b/w atria and ventricles.
ECG and Arrhythmia 2