Neural and hormonal control of blood pressure in conscious monkeys.
The contribution of the autonomic nervous system, angiotensin II (ANG II), and arginine vasopressin (AVP) to the control of blood pressure (BP) was examined in 12 chronically instrumented tethered monkeys. The vasopressin antagonist, [d(CH2)5AVP] (Manning Compound, MC), the ANG II antagonist, saralasin (SAR), and the ganglionic blocking drug, hexamethonium (Hx), were injected in a random sequence into the left atrium (LA) while BP and heart rate (HR) were monitored. When given as the first antagonist, MC caused a slight decrease in BP; SAR did not significantly decrease BP regardless of the sequence of administration, whereas Hx caused a consistent decrease in blood pressure of 35-50 mmHg. Seven (4 intact and 3 with renal denervation) additional animals were involved in hemorrhage experiments. Blood pressure was reduced to 50-60 mmHg by hemorrhage and then allowed to return spontaneously. Ten to 15 min after the end of the hemorrhage, MC was given. When blood pressure had stabilized, SAR was given. Blood pressure returned to 80-90 mmHg after the hemorrhage. MC did not affect the blood pressure recovery; however, saralasin reduced it to the post-hemorrhage levels. We would conclude that the sympathetic nervous system is the primary controlling mechanism for BP in the conscious primate, with AVP making a minor contribution. The release of renin would appear to be primarily under the control of the sympathetic nervous system.
Cornish
K G
KG
Department of Physiology and Biophysics, University of Nebraska College of Medicine, Omaha 68105-1065.
Barazanji
M W
MW
Iaffaldano
R
R
D000818:Animals; D000959:Antihypertensive Agents / Q000494:pharmacology; D001127:Arginine Vasopressin / Q000031:analogs & derivatives / Q000494:pharmacology / Q000502:physiology*; D001341:Autonomic Nervous System / Q000502:physiology*; D001794:Blood Pressure / Q000502:physiology*; D003714:Denervation; D005260:Female; D006470:Hemorrhage / Q000503:physiopathology; D018738:Hexamethonium; D006584:Hexamethonium Compounds / Q000494:pharmacology; D007668:Kidney / Q000294:innervation; D008253:Macaca mulatta; D008297:Male; D012084:Renin-Angiotensin System / Q000502:physiology*; D012504:Saralasin / Q000494:pharmacology
D000959:Antihypertensive Agents; D006584:Hexamethonium Compounds; D001127:Arginine Vasopressin; D018738:Hexamethonium; C025044:argipressin, beta-mercapto-beta,beta cyclopentamethylenepropionic acid(1)-; D012504:Saralasin