The influence of cardiopulmonary receptors on long-term blood pressure control and plasma renin activity in conscious dogs

1987 ◽  
Vol 130 (4) ◽  
pp. 553-561 ◽  
Author(s):  
P. PERSSON ◽  
H. EHMKE ◽  
H. KIRCHHEIM ◽  
H. SELLER
Keyword(s):  
Blood Pressure ◽  
Plasma Renin Activity ◽  
Blood Pressure Control ◽  
Plasma Renin ◽  
Pressure Control ◽  
Renin Activity ◽  
Conscious Dogs ◽  
Cardiopulmonary Receptors

Glucocorticoid Inhibition of Mineralocorticoid Action in the Rat

1984 ◽  
Vol 67 (3) ◽  
pp. 329-335 ◽  
Author(s):  
C. J. Kenyon ◽  
N. A. Saccoccio ◽  
D. J. Morris
Keyword(s):  
Blood Pressure ◽  
Plasma Renin Activity ◽  
Plasma Renin ◽  
Renin Activity ◽  
Plasma Sodium ◽  
Long Term Effects ◽  
Physiological Dose ◽  
Acute Changes ◽  
Adrenalectomized Rats

1. The mineralocorticoid activity of corticosterone based on acute changes in urinary Na+/K+ ratios in adrenalectomized rats was 1000 times less than that of aldosterone. However, corticosterone had only kaliuretic actions whereas aldosterone had both antinatriuretic and kaliuretic properties. Corticosterone inhibited the antinatriuretic actions of aldosterone. 2. Adrenalectomized rats infused continuously with a physiological dose of corticosterone (1 mg/day) were 5 times less sensitive to the antinatriuretic and 25 times less sensitive to the kaliuretic actions of aldosterone when administered acutely than were control adrenalectomized rats. 3. The long term effects of infusions of physiological doses of aldosterone and corticosterone were assessed in adrenalectomized rats maintained in metabolic cages. Aldosterone lowered plasma renin activity and reduced fluid (0.3% NaCl) intake; these effects were diminished when aldosterone and corticosterone were infused simultaneously. Plasma renin activity and fluid intake were correlated in long term infusion experiments. Both hormones had hypokalaemic effects but these were not additive. Corticosterone, but not aldosterone, increased systolic blood pressure and plasma sodium levels. 4. We conclude that glucocorticoid effects on water and electrolyte metabolism are different from those of mineralocorticoids, that glucocorticoids may antagonize mineralocorticoid effects and that interactions between mineralocorticoids and glucocorticoids may be important in long term blood pressure regulation.

Blood Pressure Control in End-Stage Renal Disease in Man: Indirect Evidence of a Complex Pathogenic Mechanism besides Renin or Blood Volume

1977 ◽  
Vol 52 (1) ◽  
pp. 19-21
Author(s):  
G. Cannella ◽  
A. Castellani ◽  
G. Mioni ◽  
M. Usberti ◽  
U. Guerra ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Plasma Renin Activity ◽  
Blood Volume ◽  
Indirect Evidence ◽  
Plasma Renin ◽  
Pressure Control ◽  
High Plasma ◽  
Renin Activity ◽  
Before And After ◽  
Stage Renal Disease

1. In twenty-three uraemic patients on regular dialysis, plasma renin activity and blood volume were measured before and after a single dialysis. Three groups were identified; the first had a low or normal plasma renin activity and a high or normal blood volume, the second had a high plasma renin activity and a low blood volume and the third had both variables above normal. 2. In spite of these differences, diastolic blood pressure before and after dialysis was the same in the three groups and multiple regression analyses failed to demonstrate any dependence of blood pressure on plasma renin activity, blood volume or body weight taken separately or together. 3. We conclude that other factors besides plasma renin activity and blood volume are important in maintaining arterial hypertension in terminal renal failure.

Arterial pressure after chronic reductions in suprarenal aortic flow in fetal lambs

1987 ◽  
Vol 253 (4) ◽  
pp. H838-H844
Author(s):  
D. F. Anderson ◽  
C. M. Parks ◽  
J. J. Faber
Keyword(s):  
Blood Pressure ◽  
Plasma Renin Activity ◽  
Arterial Blood Pressure ◽  
Plasma Renin ◽  
Aortic Flow ◽  
Renin Activity ◽  
Upper Body ◽  
Aortic Blood Flow ◽  
Arterial Blood

Experiments were performed on 13 fetal lambs of 126 days gestational age. Seven days after surgery, suprarenal aortic blood flow was reduced to 70% of control with an inflatable occluder for a period of at least 4 days. This produced an almost constant aortic pressure difference of 35 mmHg across the occluder. Plasma renin activity (PRA) rose in the next hour from 6 to 42 ng.ml-1.h-1 (P less than 0.01) but decreased to a level that was statistically insignificantly above normal by the next day. PRA as a function of lower body arterial blood pressure showed rapid adaptation. Upper body arterial blood pressure was statistically significantly elevated by 5 mmHg within 5 min and continued to rise while plasma renin activity was falling. Femoral artery blood pressure dropped immediately but returned to near normal within 1 h and remained there. The long-term upper body hypertension was irreversible with a 30-min infusion of saralasin. Subrenal aortic flow reduction caused none of these changes. We conclude that the fetal kidneys can regulate arterial blood pressure upward but that the long-term effect does not depend solely on a direct vasoconstrictive action of angiotensin.

Reflex inhibition of plasma renin activity by increased left ventricular pressure in conscious dogs

1989 ◽  
Vol 256 (6) ◽  
pp. R1299-R1307
Author(s):  
A. J. Gorman ◽  
J. S. Chen
Keyword(s):  
Blood Pressure ◽  
Heart Rate ◽  
Plasma Renin Activity ◽  
Arterial Blood Pressure ◽  
Left Atrial ◽  
Plasma Renin ◽  
Left Ventricular ◽  
Renin Activity ◽  
Conscious Dogs ◽  
Arterial Blood

The purpose of the present study was to determine the effects of left ventricular (LV) outflow obstruction on plasma renin activity (PRA) and the contribution from afferent receptors located in the LV myocardium. In chronically instrumented, conscious dogs (n = 12), changes in PRA during a 15- to 20-mmHg decrease in arterial blood pressure were assessed during 1) intravenous infusions of nitroprusside (NP) alone and 2) infusions of NP while peak systolic LV pressure was elevated by acute ascending aortic occlusion (AAO + NP). Infusions of NP alone elicited significant increases in heart rate (24.9 +/- 5.1 beats/min; P less than 0.01) and in PRA [3.31 +/- 0.53 ng angiotensin I (ANG I).ml-1.h-1; P less than 0.01]. These were accompanied by decreases in both LV pressure (-13.8 +/- 3.6 mmHg; P less than 0.05) and left atrial pressure (-3.0 +/- 0.7 mmHg; P less than 0.05). During AAO + NP, LV pressure was elevated to an absolute level of 169.2 +/- 4.6 mmHg (+53.3 +/- 4.2 mmHg; P less than 0.001), whereas left atrial pressure was not changed. Both the hypotension-induced rise in PRA and tachycardia were significantly inhibited during AAO + NP (+0.59 +/- 0.29 ng ANG I.ml-1.h-1 and +6.3 +/- 4.6 beats/min, respectively; NS). The topical application of a local anesthetic in the region of the main coronary artery, sufficient to block the heart rate and arterial blood pressure responses to selective LV receptor stimulation by intracoronary veratridine (0.1-0.4 microgram/kg), resulted in significant increases in PRA and heart rate during AAO + NP.(ABSTRACT TRUNCATED AT 250 WORDS)

Effects of the Oral Angiotensin-Converting Enzyme Inhibitor MK-421 in Human Hypertension

1981 ◽  
Vol 61 (s7) ◽  
pp. 281s-283s ◽  
Author(s):  
H. Gavras ◽  
J. Biollaz ◽  
B. Waeber ◽  
H. R. Brunner ◽  
Gavras Irene ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Angiotensin Converting Enzyme ◽  
Plasma Renin Activity ◽  
Enzyme Inhibitor ◽  
Plasma Renin ◽  
Pressure Control ◽  
Renin Activity ◽  
Converting Enzyme ◽  
Blood Pressure Fall ◽  
Plasma Angiotensin

1. The effects of the new oral angiotensin-converting enzyme (ACE) inhibitor MK-421 on blood pressure, plasma renin activity, angiotensin II, aldosterone and converting enzyme activity were assessed in 16 hypertensive patients followed for 6–18 weeks. 2. After an initial titration period, maintenance doses of 2.5–40 mg once daily produced satisfactory blood pressure control in 11 and a partial but significant decrease in the remainder. 3. Treatment was associated with no change in heart rate and no orthostatic hypotension. At 24 h after the first effective dose, blood pressure was still decreased, plasma ACE was suppressed to 16% of the baseline, plasma angiotensin to 58%, aldosterone to 42%, and plasma renin activity was elevated to 228% of the baseline. 4. Magnitude of blood pressure fall was significantly correlated with the height of pretreatment blood pressure but not with baseline levels of plasma renin activity.

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