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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