A conduction disorder , also called conduction disorder, is a disruption of the transmission of excitation from the stimulation center to the deeper heart sections and thus a delay or interruption of the electrical excitation of the heart muscles . The term conduction disorder, which is often used as an alternative, is imprecise because a stimulus cannot be passed on, only the excitation caused by it.
At the atrial level, there are conduction disorders between the body's own clock ( sinus node ) and the atrial muscles. This disorder is known as the sinoatrial block ( SA block ). Depending on whether the disturbance of the excitation conduction from the sinus node to the atrial muscles or in the atrium occurs, one speaks of sinuauricular or intraauricular (see sinus node nomenclature ) disturbance of the spread of excitation. The excitation then spreads diffusely through the atria. The heart chambers are then "electrically isolated" from the atria. Only a thin pathway connects the atria with the ventricles, the so-called AV node . Disorders in this region are known as the atrioventricular block ( AV block ). After the AV node, the excitation is passed on to the muscles of the left and right ventricle via two conduction pathways ( Tawara legs ). If one of these two limbs is interrupted, it is called a bundle branch block , which is an intraventricular conduction disorder. If both legs are interrupted, this corresponds to the picture of a total AV block.
The interference of the excitation line are distinct from impulse formation disorders (disorders of impulse formation , for which purpose the nomotopen (from the sinus node outgoing) impulse formation disorders sinus tachycardia , sinus bradycardia and sinus arrhythmia and heterotopic (an atypical location resulting) impulse formation disorders such escape rhythms (for example, ventricular escape rhythm ), extrasystoles , paroxysmal atrial and ventricular tachycardia , atrial flutter , and - flicker and ventricular flutter and ventricular fibrillation belong) in which the impact sequence is no longer made of the heart by a real impulse formation in the sinus node.
- Herbert Reindell , Helmut Klepzig: Diseases of the heart and the vessels. In: Ludwig Heilmeyer (ed.): Textbook of internal medicine. Springer-Verlag, Berlin / Göttingen / Heidelberg 1955; 2nd edition ibid 1961, pp 450-598, herein: S. 559-571 ( impulse formation disorders ), especially p 571st
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- Herbert Reindell, Helmut Klepzig: Diseases of the heart and the vessels. 1961, p. 571.
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- Herbert Reindell, Helmut Klepzig: Diseases of the heart and the vessels. 1961, p. 573 f. ( Intraventricular conduction disorders ).
- Herbert Reindell , Helmut Klepzig: Diseases of the heart and the vessels. In: Ludwig Heilmeyer (ed.): Textbook of internal medicine. Springer-Verlag, Berlin / Göttingen / Heidelberg 1955; 2nd edition ibid 1961, pp 450-598, here: p 559-571 ( impulse formation disorders ).