Key result
Accelerated idioventricular rhythm with marked inferior ST elevation reveals acute inferior myocardial infarction.
Why the study?
Wide QRS complexes arise from conduction abnormalities or ventricular origins, requiring clarification of their mechanisms and classifications.
Case Report (n=1)
Accelerated idioventricular rhythm is a transient wide-complex rhythm often seen as a result of an acute process such as myocardial infarction.
Answers are grounded in this paper and cite their sources.
ECG pattern aids wide-QRS differentiation in acute MI; leaves open prospective validation of diagnostic criteria.
Wide QRS complexes are the result of conduction abnormalities or arise in the ventricles. Conduction abnormalities causing wide QRS may be due to conduction system disorders affecting the bundles, accessory pathways or drugs. Confirmation of bundle branch block requires evidence of rapid conduction of the unaffected bundle. Wide non-conducted QRS complexes are either intrinsic (ventricular escape, accelerated idioventricular rhythm or ventricular tachycardia, as classified by rate) or extrinsic (pacing). Accelerated idioventricular rhythm is usually transient and the result of an acute process: infarction, inflammation or injury (surgery).
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Andrzej M. Okreglicki (2017) conducted a case report in Accelerated idioventricular rhythm and acute inferior myocardial infarction (n=1). Acute inferior myocardial infarction was evaluated. The patient's ECG demonstrated an accelerated idioventricular rhythm with marked inferior ST segment elevation, indicative of a recent acute inferior myocardial infarction.
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