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A bundle branch block can be diagnosed when the duration of the QRS complex on the ECG exceeds 120 ms. A right bundle branch block typically causes prolongation of the last part of the QRS complex and may shift the heart's electrical axis slightly to the right.
A bundle branch block is when the electrical signal from the AV node gets blocked or delayed along one of the bundle branches in the ventricles. It is usually caused by fibrosis of heart tissue from acute or chronic heart disease.
The bundle TP/G is called the bundle of principal connections (Kobayashi 1957). A section Γ of dπ:TP/G→TM such that Γ : TM → TP/G is a linear morphism of vector bundles over M, can be identified with a principal connection in P. Conversely, a principal connection as defined above gives rise to such a section Γ of TP/G.
The bundle branches were separately described by Retzer and Braeunig as early as 1904, but their physiological function remained unclear and their role in the electrical conduction system of the heart remained unknown until Sunao Tawara published his monograph on Das Reizleitungssystem des Säugetierherzens (English: The Conduction System of the Mammalian Heart) in 1906. [4]
Mahaim pathways are typically seen on the right side of the heart, with their ventricular connection lying within or close to the right bundle branch. [4] The fibres often conduct slowly and in one direction only - from the atria to the ventricles (antegrade conduction); not from the ventricles to the atria (retrograde conduction).
Infra-Hisian block is that of the distal conduction system. Types of infra-Hisian block include: Type 2 second degree heart block (Mobitz II) – a type of AV block due to a block within or below the bundle of His [5] Left anterior fascicular block; Left posterior fascicular block; Right bundle branch block; Left bundle branch block
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Trained athletes, for example, usually show heart rates slower than 60 bpm when not exercising. If the SA node fails to initialize, the AV junction can take over as the main pacemaker of the heart. The AV junction consists of the AV node, the bundle of His, and the surrounding area; it has a regular rate of 40 to 60 bpm.