Bundle branch block

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Classification according to ICD-10
I44.4 Left anterior fascicular block
I44.5 Left posterior fascicular block
I44.6 Other and unspecified
fascicular block - left hemiblock onA
I45.0 Right fascicular block
I45.2 Bifascicular block
I45.3 Trifascicular block
ICD-10 online (WHO version 2019)

A bundle branch block is a dysfunction in one of the two tawara limbs , which in the heart conduct electrical excitation from the bundle of His to the right and left ventricles . It is an intraventricular conduction disorder .

Depending on whether it is a right bundle branch block or a left bundle branch block , the excitation of the heart muscle is delayed on one side. However, it then also spreads from one side to the other. In general, disorders in the left heart are more significant than in the right. Since the left tawara thigh has an anterior and a posterior branch, there is also the left anterior (anterior) and the left posterior (posterior) branch block. If the conduction of excitation from the atrium to the conduction fibers of the ventricles is generally disturbed, one speaks of an AV block (disturbance of the atrioventricular spread of excitation).

The electrocardiogram (EKG) is particularly suitable for diagnosing electrical phenomena in the heart .


  • Herbert Reindell , Helmut Klepzig: diseases of the heart and blood vessels. In: Ludwig Heilmeyer (ed.): Textbook of internal medicine. Springer-Verlag, Berlin / Göttingen / Heidelberg 1955; 2nd edition ibid. 1961, pp. 450-598, here: pp. 572 f. ( Disorders of the atrioventricular propagation of excitation ) and 573 f. ( Intraventricular conduction disorders ).