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Summary – Mobitz 1 vs 2 Mobitz 1 and 2 are the two forms of second-degree heart block. The difference between them is in mobitz 1 there is a gradual increase in the duration of PR interval until an impulse completely wanes off before reaching the ventricles but in mobitz 2 although the PR interval is prolonged it does not change with time.
Type 2 (Mobitz II/Hay) Type 2 Second-degree AV block, also known as "Mobitz II," is almost always a disease of the distal conduction system ( His-Purkinje System ). Mobitz II heart block is characterized on a surface ECG by intermittently nonconducted P waves not preceded by PR prolongation and not followed by PR shortening.
Second-Degree (AV) Heart Block (Type 2) Second degree heart block Type 2, which is also called Mobitz II or Hay, is a disease of the electrical conduction system of the heart. Second-degree AV block (Type 2) is almost always a disease of the distal conduction system located in the ventricular portion of the myocardium.
2 nd Degree Type 2 | Mobitz II. Many people like to confuse this rhythm with a Wenckebach and third degree. However, there are some major differences. One being the rhythm is not cyclic, it does NOT have a pattern. Second, its QRS complexes will be IRREGULAR and this is the opposite for a 3 rd degree heart block.
There may be no pattern to the conduction blockade, or alternatively there may be a fixed relationship between the P waves and QRS complexes, e.g. 2:1 block, 3:1 block. Causes of Mobitz II Anterior MI (due to septal infarction with necrosis of the bundle branches).
The Mobitz type II AV block is secondary to a disease involving the His-Purkinje system, in which there is a failure to conduct impulses from the atria into the ventricles. A block occurs after the AV node within the bundle of His, or within both bundle branches.