Ashman phenomenon

Author: Dr. med. S. Leah Schröder-Bergmann

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Last updated on: 29.10.2020

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Synonym(s)

Long cycle - short cycle- sequence

History
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The Ashman phenomenon was first mentioned by Lewis in 1910. J. L. Gouaox and B. Ashman described this phenomenon in 1947 in detail as a so-called "long cycle - short cycle- sequence" (Gertsch 2008 / Roskamm 1996).

Definition
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An Ashman phenomenon is a special form of aberration that can occur intermittently. In the ECG, after a longer R- R- interval, a short interval is found and the following beat is conducted with aberration, whereby the image of a right bundle branch block (RSB) occurs more frequently than that of a left bundle branch block (LSB) (Gertsch 2008 / Roskamm 1996).

Occurrence
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The Ashman phenomenon occurs in different types of atrial arrhythmias. It is most commonly found in atrial fibrillation (Olshausen 1996).

Etiology
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The Ashman phenomenon is caused by an increase in the refractory time of the His-Purkinje system and the ventricular myocardium as soon as the heart rate decreases or the cycle time increases (Olshausen 1996).

Differential diagnosis
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Ventricular Extrasystole (VES): Here, the same QRS configuration has the same QRS width. Following a VES there is a compensatory pause (Roskamm 1996).

Literature
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  1. Gertsch M (2008) The ECG - At a glance and in detail. Springer Medicine Publishing House 569
  2. von Olshausen K (1996) ECG Information: Basics - Morphological Interpretation - Clinical Syndromes - Rhythm Disorders - Pacemakers - ECG - ECG- Technique and Artifacts. Steinkopff Darmstadt publishing house 208
  3. Roskamm H et al (1996) Heart diseases: pathophysiology - diagnostics - therapy. Springer Publishing House 503

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Last updated on: 29.10.2020