First-degree heart block involves a fixed prolonged PR interval (>200 ms). Second-degree AV block (type 1) is also known as Mobitz type 1 AV block or Wenckebach phenomenon. Typical ECG findings in Mobitz type 1 AV block include progressive prolongation of the PR interval until eventually the atrial impulse is not conducted and the QRS complex is dropped.
AV nodal conduction resumes with the next beat and the sequence of progressive PR interval prolongation and the eventual dropping of a QRS complex repeats itself.
MD (Med), DNB (Cardio),Interventional Cardiologist, KIMS Hospital
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