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  • Title: Assessment of heart rate turbulence in the acute phase of myocardial infarction for long-term prognosis.
    Author: Sade E, Aytemir K, Oto A, Nazli N, Ozmen F, Ozkutlu H, Tokgözoglu L, Aksöyek S, Ovünç K, Kabakçi G, Ozer N, Kes S.
    Journal: Pacing Clin Electrophysiol; 2003 Feb; 26(2 Pt 1):544-50. PubMed ID: 12710312.
    Abstract:
    This study is designed to assess the value of heart rate turbulence (HRT) in the acute phase of MI for prediction of long-term mortality risk. The study included 128 consecutive acute MI patients with 24-hour Holter recordings to evaluate HRT (turbulence onset and slope), SDNN, mean RR interval, and ventricular premature beat frequency. LVEF was evaluated by two-dimensional echocardiography. Data from 117 patients (mean age 58 +/- 11 years) were available for further analysis. Twelve patients died during follow-up (mean 312 +/- 78 days). Although SDNN < 70 ms was the most powerful predictor of mortality among all presumed risk factors (hazard ratio 20 [95% CI 2.6-158]; P = 0.004) in univariate Cox regression analysis, in multivariate analysis LVEF < or = 0.40 and turbulence slope < or = 2.5 ms/RR interval were the only independent predictors of mortality (hazard ratio 6.9 [95% CI 1.8-26]; P = 0.006, hazard ratio 7.3 [95% CI 1.4-37]; P = 0.016, respectively). Addition of HRT parameters for LVEF increased remarkably the positive predictive value (60%) without any decrease in the negative predictive value (92%). Blunted HRT reaction within the first 24 hours of acute MI is an independent predictor of long-term mortality. Furthermore, its predictive power is comparable and also additive to that of LVEF.
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