Accelerated idioventricular rhythm (AIVR) is an arrhythmia in which electrical impulses originate in the ventricles, resulting in wide QRS complexes on the electrocardiogram (ECG). The heart rate associated with AIVR usually ranges from 50 to 130 beats per minute (bpm). This arrhythmia results from enhanced ventricular automaticity, in which ventricular cells take over the pacemaker function and temporarily suppress the heart's normal rhythm. It is frequently associated with ischemic heart disease, especially in the setting of ischemia or reperfusion.
ECG Criteria
- Wide QRS complexes with a duration > 120 ms, not preceded by a P wave
- It is not an escape rhythm, since it competes directly with the patient's underlying rhythm
ECG in Accelerated Idioventricular Rhythm
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Related Topics
References
- Samesima N, God EG, Kruse JCL, Leal MG, et al. Diretriz da Sociedade Brasileira de Cardiologia sobre a Análise e Emissão de Laudos Eletrocardiográficos – 2022. Arq Bras Cardiol. 2022;93(3 Suppl 2):2–19.
- Scheffer MK, De Marchi MFN, de Alencar Neto JN, Felicioni SP. Eletrocardiograma de A a Z. São Paulo: Manole, 2024.
