The vagus nerve (VN), the longest cranial nerve and an essential part of the parasympathetic system, connects the central nervous system to respiratory, cardiovascular, immune, gastrointestinal, and endocrine systems and is involved in the maintenance of homeostasis by controlling these systems. Vagus nerve stimulation (VNS) is related to any method that would stimulate the vagal nerve via elec...

REFERENCES 1. Murphy JV. Left vagal nerve stimulation in children with medically refractory epilepsy. The Pediatric VNS Study Group. J Pediatr 1999;134:563–6. 2. Patwardhan RV, Stong B, Bebin EM, et al. Efficacy of vagal nerve stimulation in children with medically refractory epilepsy. Neurosurgery 2000;47:1353–8. 3. Murphy JV, Tokelson R, Dowler I, et al. Vagal nerve stimulation in refractory ...

The duration of the monophasic action potential (APD), the interval between atrial beats and the delay time between excitation of the right and left atria of dogs were measured, using coaxial suction electrodes, before and during vagal stimulation. The effect of vagal stimulation on the degree of shortening of APD varied at different recording sites in the atrium, the shortening being more pron...

We determined the effects of the timing of repetitive bursts of vagal stimulation on the positive chronotropic responses of the heart to trains of cardiac sympathetic nerve stimulation in open-chest anesthetized dogs. Trains of sympathetic stimulation alone, at frequencies of 2 and 4 Hz, decreased the cardiac cycle length by 176 +/- 19 msec (mean +/- SE) and 190 +/- 22 msec, respectively. When ...

Neuropeptide Y (NPY) attenuates vagal effects on cardiac cycle length, presumably by inhibiting the release of acetylcholine from vagal nerve endings. We sought to determine if NPY inhibited the vagal effects on atrioventricular (AV) interval and atrial contraction in a manner similar to its inhibition of the vagal effects on cycle length. In 19 anesthetized dogs we measured the vagal effects o...

Objective Mechanisms of pulmonary vein isolation (PVI) for atrial fibrillation remain controversy. This study aimed to investigate the impact of PVI on vagal modulation to atria. Methods Eighteen adult mongrel dogs under general anesthesia were randomly divided into two groups. Bilateral cervical sympathovagal trunks were decentralized and sympathetic effects was blocked by metoprolol administr...

We determined the influence of differences in the time of initiation of sympathetic and vagal stimulation (both at 10 Hz) on the cardiac autonomic interactions in 16 open-chest anesthetized dogs. We always ended the concurrent sympathetic and vagal stimulations simultaneously. Sympathetic stimulation alone for 1 minute increased heart rate by 90±7 (mean+SEM) beats per minute, and vagal stimulat...

Responses to vagal stimulation and acetylcholine were investigated in the feline pulmonary vascular bed under conditions of controlled pulmonary blood flow and constant left atrial pressure. Under baseline conditions, electrical stimulation of vagal efferent fibers increases lobar arterial pressure. However, when vasoconstrictor tone was increased, a depressor response was unmasked. The pressor...