Although enhanced sympathetic tone is a well recognized component of the autonomic
profile characteristic of congestive heart failure, the contribution of parasympathetic …

Neurohumoral modulation of cardiovascular function is an important component of the
hemodynamic alterations in patients with chronic congestive heart failure (CHF). Analysis of …

BACKGROUND--Activation of the sympathetic nervous system has been extensively studied
in patients with chronic heart failure, but the parasympathetic nervous system has received …

Patients with congestive heart failure have been considered to have augmented sympathetic
drive both at rest and during dynamic exercise. The augmentation observed during exercise …

In their recent investigation on heart period variability in healthy trained and untrained young
men, Goldsmith et al.(1) conclude that" 24-h low frequency power is primarily …

Twenty-five patients (aged 62±2 years) with stable, moderate to severe ischemic congestive
heart failure (CHF)(New York Heart Association class II/III: 15/10; ejection fraction 21.6±2%; …

Proposed reflex mechanisms for generalized neurohumoral activation in heart failure
include decreased input from inhibitory baroreceptor afferent vessels and increased input …

To assess autonomic nervous activity in patients with cardiomyopathies, analysis of heart
rate variability was performed using 24-hour ambulatory electrocardiograms in 14 patients …

Heart failure is characterized by an elevation in sympathetic tone. The mechanisms
responsible for this sympatho-excitation of heart failure are not completely understood …

Heart rate (HR) variability has long been recognized as a sign of cardiac health. In the
presence of heart disease, HR variability decreases, an observation that has been …