Prevalence, characteristics and natural course of inappropriate sinus tachycardia.

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.

Fractal analysis of heart rate variability and mortality after an acute myocardial infarction.

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 myocardial infarction (AMI). A consecutive series of 697 patients were recruited to participate 2 to 7 days after an AMI in 3 Nordic university hospitals.

Impaired negative chronotropic response to adenosine in patients with inappropriate sinus tachycardia.

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.