Accelerated idioventricular rhythm (AIVR) at a rate of 55/min presumably originating from the left ventricle (LV). Note the typical QRS morphology in lead V1 characteristic of ventricular ectopy from the LV. Monophasic R-wave with smooth upstroke and notching on the downstroke (i.e., the so-called taller left peak or "rabbit-ear".)
Specialty
Cardiology
Accelerated idioventricular rhythm is a ventricular rhythm with a rate of between 40 and 120 beats per minute. Idioventricular means “relating to or affecting the cardiac ventricle alone” and refers to any ectopic ventricular arrhythmia.[1] Accelerated idioventricular arrhythmias are distinguished from ventricular rhythms with rates less than 40 (ventricular escape) and those faster than 120 (ventricular tachycardia).[2] Though some other references limit to between 60 and 100 beats per minute.[3] It is also referred to as AIVR and "slow ventricular tachycardia."
It can be present at birth.[4] However, it is more commonly associated with reperfusion after myocardial injury.[2] AIVR is generally considered to be a benign abnormal heart rhythm. It is typically temporary and does not require treatment.
^Norris, RM; Mercer, CJ (Mar–Apr 1974). "Significance of idioventricular rhythms in acute myocardial infarction". Progress in Cardiovascular Diseases. 16 (5): 455–68. doi:10.1016/0033-0620(74)90006-1. PMID 4590952.
^ abFuster V, Walsh RA, Harrington RA, eds. (2011). Hurst's the Heart (13th ed.). New York: McGraw-Hill Medical. ISBN 9780071636469.
^Longo DL, Kasper DL, Jameson JL, Fauci AS, Hauser SL, Loscalzo J, eds. (2012). Harrison's Principles of Internal Medicine (18th ed.). New York: McGraw-Hill. ISBN 978-0071748896.
^Freire G, Dubrow I (March 2008). "Accelerated idioventricular rhythm in newborns: a worrisome but benign entity with or without congenital heart disease". Pediatr Cardiol. 29 (2): 457–62. doi:10.1007/s00246-007-9024-z. PMID 17687587. S2CID 28730649.
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