CARDIOVASCULAR HAEMODYNAMICS AND THE RESPONSE OF VASOPRESSIN, ALDOSTERONE, PLASMA RENIN ACTIVITY AND PLASMA CATECHOLAMINES TO HEAD-UP TILT IN YOUNG AND OLD HEALTHY SUBJECTS

1986 ◽  
Vol 15 (1) ◽  
pp. 17-28 ◽  
Author(s):  
ENRIQUE VARGAS ◽  
MICHAEL LYE ◽  
E. BRIAN FARAGHER ◽  
CHRISTOPHER GODDARD ◽  
BILL MOSER ◽  
...  
Keyword(s):  
Plasma Renin Activity ◽  
Healthy Subjects ◽  
Plasma Catecholamines ◽  
Plasma Renin ◽  
Renin Activity ◽  
Head Up Tilt

Plasma Catecholamines, Plasma Renin Activity and Plasma Aldosterone in Tetraplegic Man, Horizontal and Tilted

1975 ◽  
Vol 49 (4) ◽  
pp. 291-299 ◽  
Author(s):  
C. J. Mathias ◽  
N. J. Christensen ◽  
J. L. Corbett ◽  
H. L. Frankel ◽  
T. J. Goodwins ◽  
...  
Keyword(s):  
Plasma Renin Activity ◽  
Cervical Spinal Cord ◽  
Plasma Catecholamines ◽  
Plasma Renin ◽  
Normal Subjects ◽  
Plasma Aldosterone ◽  
Renin Activity ◽  
Normal Male ◽  
Head Up Tilt ◽  
The Brain

1. Plasma catecholamines, plasma renin activity, plasma aldosterone and haematocrit were measured in four subjects with physiologically complete cervical spinal cord transections, before, during and after head-up tilt to 45° for 30 min. Plasma catecholamines were measured in five normal male volunteers in the supine position and after head-up tilt to 45° for 10 min. 2. After 10 min of head-up tilt, the plasma noradrenaline rose 14% in the tetraplegic patients and 115% in the control subjects. These findings indicate a failure of sympathetic activity in response to head-up tilt in the tetraplegic patients, probably caused by interruption of pathways by which the brain normally controls sympathetic outflow. 3. In the tetraplegic patients the resting plasma renin activities were above normal, and rose more quickly and greater on head-up tilt than in published studies of normal subjects. It is likely that the renal baroreceptors are important in the control of renin release. 4. In the tetraplegic patients, there was a late rise in plasma aldosterone which was probably due to the elevation in plasma renin activity.

REDUCED PLASMA RENIN ACTIVITY IN ELDERLY SUBJECTS IN RESPONSE TO VASOVAGAL HYPOTENSION AND HEAD-UP TILT

1987 ◽  
Vol 16 (3) ◽  
pp. 171-177 ◽  
Author(s):  
ROSE ANNE KENNY ◽  
CALUM C. LYON ◽  
JOHN BAYLISS ◽  
STAFFORD L LIGHTMAN ◽  
RICHARD SUTTON
Keyword(s):  
Plasma Renin Activity ◽  
Plasma Renin ◽  
Renin Activity ◽  
Elderly Subjects ◽  
Head Up Tilt

Plasma Catecholamines and Plasma Renin Activity at Birth and during the First Days of Life

1980 ◽  
Vol 59 (s6) ◽  
pp. 319s-321s ◽  
Author(s):  
G. Leonetti ◽  
C. Bianchini ◽  
G. B. Picotti ◽  
A. Cesura ◽  
Letizia Caccamo ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Plasma Renin Activity ◽  
Umbilical Cord Blood ◽  
Plasma Catecholamines ◽  
Plasma Renin ◽  
Renin Activity ◽  
Plasma Noradrenaline ◽  
Plasma Adrenaline ◽  
Noradrenaline And Adrenaline ◽  
Noradrenaline Levels

1. Plasma noradrenaline and adrenaline concentrations and plasma renin activity were measured in 21 mothers at delivery and in their babies at birth (umbilical cord blood) and on days 1 and 5 of extrauterine life. 2. At birth plasma renin activity was significantly higher in the newborn than in mothers. Plasma renin activity increased further, but not significantly, on day 1 of life and significantly decreased on day 5. On day 5, 10 min head-up tilting caused no change in plasma renin activity. 3. Plasma noradrenaline in the newborn was higher than in mothers at birth and significantly decreased thereafter. Plasma adrenaline levels at birth were similar in the newborn and their mothers and significantly lower in the newborn in subsequent days. Tilting caused no increase in either plasma adrenaline or noradrenaline levels. 4. No correlation was found between plasma noradrenaline and adrenaline levels and plasma renin activity, or between noradrenaline, adrenaline or plasma renin activity and blood pressure.

The Effect of Mental Stress on Catecholamines, their Metabolites and Plasma Renin Activity in Patients with Essential Hypertension and in Healthy Subjects

1979 ◽  
Vol 57 (s5) ◽  
pp. 229s-231s ◽  
Author(s):  
W. Januszewicz ◽  
M. Sznajderman ◽  
B. Wocial ◽  
T. Feltynowski ◽  
T. Klonowicz
Keyword(s):  
Essential Hypertension ◽  
Plasma Renin Activity ◽  
Urinary Excretion ◽  
Mental Stress ◽  
Healthy Subjects ◽  
Plasma Renin ◽  
Renin Activity ◽  
Vanillylmandelic Acid ◽  
Before And After ◽  
Noradrenaline And Adrenaline

1. Ten patients with essential hypertension and ten healthy men were submitted to mental stress consisting of Kraepelin's arithmetic test combined with noise. Concentrations of plasma and urine catecholamines and of their metabolites as well as plasma renin activity before and after the test were studied. 2. In both groups a significant increase of noradrenaline and adrenaline in blood and noradrenaline in urine was observed. The urinary excretion of dopamine fell significantly in both groups after stress. 3. After mental stress a significant increase in urinary excretion of 3-methoxy-4-hydroxyphenylglycol was observed in both groups. The excretion of vanillylmandelic acid decreased significantly only in healthy subjects. 4. The plasma renin activity rose significantly in both groups but the increase was more pronounced in healthy subjects.

Familial Hypertension and Hormonal Profile, Renal Haemodynamics and Body Fluids of Young Normotensive Subjects

1978 ◽  
Vol 55 (s4) ◽  
pp. 367s-371s ◽  
Author(s):  
G. Bianchi ◽  
G. B. Picotti ◽  
G. Bracchi ◽  
D. Cusi ◽  
M. Gatti ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Plasma Renin Activity ◽  
Plasma Flow ◽  
Renal Plasma Flow ◽  
Plasma Catecholamines ◽  
Plasma Renin ◽  
Significant Negative Correlation ◽  
Renin Activity ◽  
Compensatory Mechanism ◽  
Normotensive Subjects

1. Almost all the factors that may cause a rise in blood pressure are, in turn, influenced by the increase in blood pressure per se. Thus any primary involvement of one or more of these factors in the pathogenesis of essential hypertension must be evaluated before or during the development of hypertension. 2. Young normotensive subjects both of whose parents are hypertensive have a much higher probability of developing hypertension than those whose parents are both normotensive. 3. The following measurements were made in 56 subjects of the first group (both parents hypertensive) and 35 of the second group (both parents normotensive), matched for age, sex and body surface area: renal plasma flow and glomerular filtration rate, using p-aminohippurate and inulin clearance; 24 h urinary excretion of aldosterone, protein and electrolytes; plasma renin activity; plasma volume. Plasma catecholamines and cardiac index were also measured in 26 subjects of the first group and 25 subjects of the second group using a radioenzymic method and echocardiography. 4. All these factors were similar in the two groups except that renal plasma flow was higher in the first group (767·2 ± 30 versus 650·7 ± 17 ml/min, P < 0·01). Plasma renin activity tended to be lower in subjects with a higher renal plasma flow, but there was no significant negative correlation between the two factors. 5. The possibility that the higher renal plasma flow in subjects with a high probability of developing hypertension is a compensatory mechanism for a primary intrarenal defect is discussed.

Reduced Plasma Renin Activity in Elderly Subjects in Response to Vasovagal Hypotension and Head Up Tilt

1986 ◽  
Vol 70 (s13) ◽  
pp. 25P-25P
Author(s):  
R A Kenny ◽  
C Lyon ◽  
J Bayliss ◽  
S Dixon ◽  
S Lightman ◽  
...  
Keyword(s):  
Plasma Renin Activity ◽  
Plasma Renin ◽  
Renin Activity ◽  
Elderly Subjects ◽  
Head Up Tilt
Sign in / Sign up

Export Citation Format

Share Document