Accession Number : AD0682289

Title :   EFFECTS OF RIGHT AND LEFT VAGAL COOLING OF HEART RATE,

Corporate Author : SCHOOL OF AEROSPACE MEDICINE BROOKS AFB TEX

Personal Author(s) : Davis,William G. , Jr

Report Date : NOV 1968

Pagination or Media Count : 11

Abstract : A study was made of the heart rate response to blockade of the right and left cervical vagosympathetic nerve trunks. In six dogs, coolers were surgically implanted around both cervical vagosympathetic nerves which permitted us to block the parasympathetic control of the heart in conscious resting dogs. With the left vagosympathetic nerve blocked there was a slight increase in heart rate and the respiratory sinus arrhythmia did not disappear. With blockade of the right vagosympathetic nerve there was a substantial heart rate increase and the respiratory sinus arrhythmia usually disappeared. There was a significant difference in the heart rate with blockade of the right as compared with the left vagosympathetic nerve trunk, indicating that the right trunk is more dominant in the resting dog and more inhibitory impulses travel over this route. The heart rate changes summed together, however, do not equal the rate observed with bilateral blockade. (Author)

Descriptors :   (*NERVES, COOLING), (*HEART, NERVES), NERVE IMPULSES, NERVE FIBERS, STIMULATION(PHYSIOLOGY), RESPIRATION, SURGICAL IMPLANTATION, AUTONOMIC NERVOUS SYSTEM, ARRHYTHMIA, DOGS

Subject Categories : Anatomy and Physiology

Distribution Statement : APPROVED FOR PUBLIC RELEASE