Parasympathetic (vagal) nerves leave the vagal nuclei within the medulla as preganglionic efferent vagal fibers. These preganglionic efferent fibers are relatively long and do not synapse until they reach their target organ (e.g., the heart).
medical Definition of isovolumetric : of, relating to, or characterized by unchanging volume; especially: relating to or being an early phase of ventricular systole in which the cardiac muscle exerts increasing pressure on the contents of the ventricle without significant change in the muscle fiber length and the ventricular volume remains constant
INTRODUCTION. Multichannel intraluminal impedance (MII) is a new technique designed to detect intraluminal bolus movement without the use of radiation.It is generally performed in combination with manometry or pH testing.ombined with manometry (multichannel intraluminal impedance and manometry; MII-EM) it provides information about both pressures and bolus transit within the esophagus. Combined with pH (multichannel intraluminal impedance and pH; MII-pH) it permits detection of both acid and non-acid gastroesophageal reflux.