Synonyms
Slow ventricular tachycardia; AIVR
Definition and Characteristics
Accelerated idioventricular rhythm (AIVR) is an ectopic rhythm with three or more consecutive ventricular premature beats with a faster rate than the normal ventricular intrinsic escape rate (30–40 beats/min) but slower than ventricular tachycardia.
Prevalence
Clinically, AIVR can occur in conjunction with any heart disorder (e.g., coronary artery disease, rheumatic heart disease, dilated cardiomyopathy, acute myocarditis, hypertensive heart disease and digitalis intoxication) or in absence of apparent heart disease both in adults and in children. No age and sex predilection have been described.
Molecular and Systemic Pathophysiology
Accelerated idioventricular rhythm is generated by abnormalities in the ventricular myocardium that set up the mechanisms for generating an ectopic rhythm (reentry, abnormal automaticity and triggered activity) but abnormal automaticity is likely the electrophysiological mechanism...
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References
Grimm W, Marchlinski FE (2000) Accelerated idioventricular rhythm, bidirectional ventricular tachycardia. In: Zipes DP, Jalife J (eds) Cardiac electrophysiology, from cell to bedside, 3rd edn. WB Saunders Co, Philadelphia, pp 673–677
Olgin JE, Zipes DP (2001) Specific arrhythmias: diagnosis and treatment. In: Braunwald E, Zipes DP, Libby P (eds) Heart disease, a textbook of cardiovascular medicine, 6th edn. WB Saunders Co, Philadelphia, pp 815–889
Diana A, Fracassi F (2005) ECG of the month. Accelerated idioventricular rhythm. J Am Vet Med Assoc 226:1488–1490
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Fracassi, F., Diana, A. (2009). Accelerated Idioventricular Rhythm. In: Lang, F. (eds) Encyclopedia of Molecular Mechanisms of Disease. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-29676-8_13
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DOI: https://doi.org/10.1007/978-3-540-29676-8_13
Publisher Name: Springer, Berlin, Heidelberg
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