Often, NMS develops after the subject experiences changes in gravitational forces. 6 One
study suggested that an abnormality in the peripheral veins could result in exaggerated …

Neurally mediated syncope is the most frequent cause of syncope in patients who do not
have structural heart disease. Neurally mediated syncope is believed to be a reflex triggered …

The objective was to determine the nature of autonomic and vasomotor changes in
adolescent patients with orthostatic tachycardia associated with the chronic fatigue …

Objectives. The aim of this study was to evaluate and compare the effects of physiologic and
pharmacologic sympathetic stimulation on time and frequency domain indexes of heart rate …

Background—The wide range of clinical presentation of orthostatic vasovagal syncope
suggests different underlying changes in the cardiac autonomic modulation. Methods and …

1. The notion that small,'non‐hypotensive'reductions of effective blood volume alter neither
arterial pressure nor arterial baroreceptor activity is pervasive in the experimental literature …

Background In the present study, we tested the hypothesis that baroreflex sensitivity is
reduced in patients with vasovagal syncope compared with normal control subjects …

Vavovagal syncope (VVS) is not generally associated with cardiovascular, neurological or
other diseases, and, therefore, represents an isolated manifestation. Isolated VVS cannot be …

The role of autonomic balance during upright tilt in patients with neurally mediated syncope
is unclear. To assess the characteristics of autonomic tone during orthostatic stress, 15 …

In the pathophysiological study of vasovagal syncope, the nature of the interaction between
baroreceptor sensitivity (BS), sympathetic withdrawal, and parasympathetic activity has yet …