In patients with valvular disease, the incidence of NSVT is considerable (up to 25% in aortic stenosis and in significant mitral regurgitation) and appears to be a marker of underlying left ventricular pathology.33,34 In patients with arterial hypertension, NSVT is correlated to the degree of cardiac hypertrophy and subendocardial fibrosis.35,36 Approximately 12% to 28% of patients with hypertension and left ventricular hypertrophy present with NSVT as opposed to 8% of patients with hypertension alone.35,36 Ventricular extrasystolic activity can be detected with Holter monitoring in up to 50% of patients with repaired tetralogy of Fallot, and recent studies have detected a 4% to 14% prevalence of sustained VT.37–39. Risk stratification attempts to identify the specific mechanisms of further morbidity to predict clinical outcomes and eventually propose clinical strategies for their prevention. Survival probability for freedom from first ICD treated ventricular tachyarrhythmia stratified by the rate of nonsustained ventricular tachycardia (NSVT) (≤200 bpm vs. > 200 bpm) in 66 patients. . A more recent meta-analysis of 15 randomized trials showed that prophylactic amiodarone had no overall benefit regarding mortality.48 In most situations, asymptomatic ventricular ectopy should be considered a risk factor for future events and not as a target for therapy. Long-term outcome in asymptomatic men with exercise-induced premature ventricular depolarizations. La Rovere MT, Pinna GD, Hohnloser SH et al. Natural history of Brugada syndrome: insights for risk stratification and management. Nonsustained ventricular tachycardia (NSVT) has been recognized as a usually asymptomatic rhythm disorder detected in an extremely wide range of conditions, from asymptomatic, apparently healthy, young individuals to patients with significant heart disease. Demosthenes G Katritsis, A.John Camm, Nonsustained ventricular tachycardia: where do we stand?, European Heart Journal, Volume 25, Issue 13, 1 July 2004, Pages 1093–1099, https://doi.org/10.1016/j.ehj.2004.03.022. , Rude RE, Poole WK et al. HV ), Independent prognostic significance not established as opposed to LVEF, Adverse prognostic significance, especially in the young, Long QT syndrome, CPVT, repaired congenital abnormalities. , Lakatta E. Prevalence and prognosis of exercise-induced nonsustained ventricular tachycardia in apparently healthy volunteers. Fig. Sheldon SH, Gard JJ, Asirvatham SJ. HL

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