Inferior Infarction and AIVR
Report:
Sinus rhythm & arrhythmia 80/min
Accelerated idioventricular rhythm 80/min
Retrograde conduction
Fusion beat (third last complex)
Acute inferior infarction
Comment:
The first beat of the resumed and now faster sinus rhythm has a slightly shorter PR interval and the complex starts with a broad primary R wave identical to those of the AIVR: it is a fusion beat. One has to look at it carefully to identify it because the S wave is so similar to that of other, “pure” sinus beats.
A trace taken before successful reperfusion (of which AIVR may be a marker) is shown below (Fig 76a), with more ST segment displacement.
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