Evidence for constriction of canine prenodal lymphatic vessels by vasoactive agents and carotid occlusion.
Microcirc Endothelium Lymphatics
; 2(1): 55-65, 1985 Feb.
Article
in En
| MEDLINE
| ID: mdl-3836336
ABSTRACT
We measured pressure in a prenodal lymphatic in the canine forelimb during constant flow pump-perfusion of the brachial artery. We made bolus i.a. injections of 1.0 micrograms angiotensin II, norepinephrine, bombesin, or bradykinin, 20 micrograms 5-hydroxytryptamine (5HT), or occluded the carotid arteries. Norepinephrine, 5HT, or carotid occlusion produced regular rises in forelimb perfusion pressure and in lymphatic pressure. Angiotensin II increased forelimb arterial pressures but increased lymphatic pressure in only four experiments. Bombesin increased artery pressures but did not affect lymphatic pressure. Small vein pressure was increased by carotid occlusion, 5HT and norepinephrine. Increases in lymphatic pressure were coincident with increases in vein pressure but no related in magnitude. Bradykinin decreased forelimb arterial and venous pressures but did not affect lymphatic pressure. Either active constriction of lymphatic vessels or passive compression by movements of adjacent blood vessels could increase lymphatic pressure. These data do not preclude a passive component of pressure rise in the lymphatics nor do they support the concept. We conclude that active constriction of prenodal lymphatic vessels in the dog forelimb can occur in response to circulating vasoactive agents and bilateral carotid occlusion.
Search on Google
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Arterial Occlusive Diseases
/
Vasoconstriction
/
Cardiotonic Agents
/
Carotid Artery Diseases
/
Lymphatic System
Limits:
Animals
Language:
En
Journal:
Microcirc Endothelium Lymphatics
Journal subject:
ANGIOLOGIA
Year:
1985
Document type:
Article