Ashman’s Phenomenon occurs in the setting
atrial fibrillation and mimics ventricular tachycardia, but is
harmless.
On
ECG, the pattern of Ashman Phenomenon is a long cycle, followed a
short cycle, followed by a complex wide complex beat.
The
wide complex beats have right BBB morphology. The long R-R
followed by a short R-R leads to conduction down the left bundle
branch while the right bundle branch is still in a refractory
period.
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