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INTRODUCTION Occurrence of sustained microvolt-level T wave alternans (TWA) at a specified heart rate has been suggested to predict life-threatening arrhythmic events, but its prognostic value has not been well established in patients who survived an acute myocardial infarction (AMI). The purpose of this prospective study was to assess the predictive(More)
AIMS To study the prevalence, characteristics and natural course of inappropriate sinus tachycardia (IST). METHODS AND RESULTS The prevalence and characteristics of IST were evaluated in a random sample of 604 middle-aged subjects. Seven of the subjects (1.16%) fulfilled the contemporary diagnostic criteria of IST. The systolic (147+/-11 mmHg vs. 130+/-13(More)
The recently developed fractal analysis of heart rate (HR) variability has been suggested to provide prognostic information about patients with heart failure. This prospective multicenter study was designed to assess the prognostic significance of fractal and traditional HR variability parameters in a large, consecutive series of survivors of an acute(More)
INTRODUCTION Adenosine is an endogenous nucleoside that has an important role in the diagnosis and treatment of several cardiac arrhythmias. However, its effects on inappropriate sinus tachycardia (IST) are not well established. METHODS AND RESULTS In this study, the response to intravenous adenosine (0.1 to 0.15 mg/kg) was studied in 18 patients (age(More)
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