BACKGROUND Low heart rate variability (HRV) is associated with an increased risk of
arrhythmic death and ventricular tachycardia (VT). The purpose of this study was to examine …

Reduced heart rate (HR) variability is associated with increased risk of cardiac arrest in
patients with coronary artery disease. In this study, the power spectral components of HR …

To investigate the incidence and clinical significance of postoperative pericardial effusion
(PE), the presence of PE was evaluated by echocardiography, 1 and 2 weeks …

Heart rate variation in deep breathing, a sensitive non-invasive measure of cardiac
parasympathetic activity, was measured in 63 patients with coronary artery disease, in 22 …

The effect of extremely exhaustive exercise on left ventricular performance was studied
echocardiographically in 13 experienced male ultramarathon runners who took part in a …

To evaluate possible differences in the cardiac effects of different types of running training,
22 competing male runners—10 sprinters and 12 endurance runners—were studied with a …

Left ventricular diastolic function was assessed by pulsed Doppler echocardiography in 21
subjects (mean age 48 yr) with insulin-dependent diabetes mellitus (IDDM) and without …

Low heart rate variability (HRV) is a predictor of a poor outcome after myocardial infarction.
To determine whether coronary artery bypass grafting (CABG) has any effect on H RV, the …

Signs of sympathetic activation are frequent during the early hours of anterior wall acute
myocardial infarction, whereas parasympathetic reflexes predominate in inferior wall acute …

Thallium tomographic imaging and exercise electrocardiography were performed on 136
diabetic patients without symptoms of heart disease. Thirty three patients had post-exercise …