Ashman phenomenon

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Ashman Phenomenon in atrial fibrillation, which is responsible for a long and short sequence followed by a wide QRS, in atrial fibrillation noted on ECG, which may resemble a ventricular ectopic beat. This is the diagrammatic representation of Ashman phenomenon. You have sequences of AF beats, and a long cycle occurs, followed by a short cycle. So this QRS is aberrant, having rSR' pattern, resembling right bundle branch block pattern. This was described by Richard Ashman, from Lousiana State University School of Medicine in New Orleans. This is the long cycle. During long cycle, there is lengthening of refractory period of the ventricle so that, when a short cycle occurs immediately after that, the right bundle is refractory. That is why, incomplete or complete right bundle branch block pattern can occur, during a long-short sequence, which is known as Ashman phenomenon and this can be mistaken for a ventricular ectopic beat.
atrial fibrillation. So that is why full compensatory pause is not seen in Ashman phenomenon.

Ashman Phenomenon in atrial fibrillation,a long and short sequence followed by a wide QRS,
iatrial fibrillation noted on ECG, which may resemble a ventricular ectopic beat. This is the diagrammatic representation of Ashman phenomenon. You have sequences of AF beats, and a long cycle occurs, followed by a short cycle. So this QRS is aberrant, having rSR' pattern, resembling right bundle branch block pattern.
Ashman phenomenon.
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Cardiology
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