Accelerated idioventricular rhythm (AIVR)
Also calledAIVR · accelerated idioventricular rhythm · slow VT
Definition
A ventricular rhythm at about 40 to 100 bpm (some sources extend the range to 120 or 130 bpm), faster than a ventricular escape rhythm (below about 40 bpm) but usually slower than ventricular tachycardia, produced mainly by abnormal (ectopic) automaticity of a ventricular focus. The QRS complexes are wide and usually monomorphic. Because its rate is close to the sinus rate, the rhythm starts and stops gradually, and fusion and capture beats can be seen where the two rhythms compete. It is classically seen during reperfusion after acute myocardial infarction, where it suggests that the culprit artery is open but does not show whether reperfusion is complete.
Sources
- Riera AR, Barros RB, de Sousa FD, Baranchuk A. Accelerated idioventricular rhythm: history and chronology of the main discoveries. Indian Pacing Electrophysiol J. 2010;10(1):40-48. pubmed.ncbi.nlm.nih.gov/20084194/
- Ashkanani AA, Ashkanani AH, Alkandari MF, et al. An accessible algorithm for the quick and precise interpretation of atrioventricular blocks in electrocardiograms. Ann Noninvasive Electrocardiol. 2026;31(4):e70207. doi.org/10.1111/anec.70207
- Samesima N, God EG, Kruse JCL, et al. Brazilian Society of Cardiology guidelines on the analysis and issuance of electrocardiographic reports - 2022. Arq Bras Cardiol. 2022;119(4):638-680. doi.org/10.36660/abc.20220623
Last reviewed 2 October 2026. Every definition in the EKG Dictionary cites the guideline, consensus statement or original paper it comes from.