From: Contemporary Cardiology: Management of Cardiac Arrhythmias Edited by: L. I. Ganz © Humana Press Inc., Totowa, NJ
Incidence of NSVT
The actual incidence of NSVT in the general population is unknown (see Fig. 1). In asymptomatic individuals with no apparent heart disease, NSVT is rare (1-4%) (3,4-10). NSVT may occur in the general population at a frequency too small to be detectable during an average 24-h observational period. Treadmill testing can detect NSVT in about 1% of an unselected population (7,8).
A relationship does exist between the extent of structural heart disease and the prevalence of NSVT (11-13). In the CHF STAT trial, 80% of patients with congestive heart failure (CHF) had NSVT on routine 24-h Holter monitoring (14). Other studies of patients with heart failure confirm a high frequency of NSVT with routine monitoring (15,16). In the GESICA trial, the incidence of NSVT was 50.3%. Prolonged monitoring of most patients with cardiomyopathy and CHF will reveal NSVT. NSVT is commonly associated with many forms of heart disease, including ischemic heart disease, cardiomy-opathy (dilated, infiltrative, and hypertrophic), congenital heart disease, valvular heart disease, myocarditis, long QT syndrome (LQTS), and right ventricular dysplasia. Approximately 35-50% of patients with acute myocardial infarction (MI) have NSVT during the acute phase of the MI, and 5-10% of those with history of MI will have NSVT in the chronic phase (17-19,20-23).
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