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Query: UMLS:C0020538 (hypertension)
 170,190 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Prophylactic administration of LL 21-945 [4-(3-tert. butyl-amino-2-pivaloyloxypropoxy)-9-fluorenone] during 15 weeks to Grollman rats depressed the development of hypertension, tachycardia and myocardial pathogical changes. The tachycardia was eliminated and the degree of the myocardial pathological changes and coronary sclerosis was less severe than in the untreated Grollman rats. The survival rate was slightly improved with LL 21-945. With respect to the biochemical parameters studied, only a tendency of LL 21-945 to moderate the rises in blood cholesterol, total glycerides and urea was observed towards the end of the experiment.
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PMID:The effects of the beta-adrenoceptor blocking agent LL 21-945 on renal hypertensive (Grollman) rats. 0 33

The removal of uremic substances in hemofiltration, in contrast to hemodialysis, is achieved by means of a convective transport across membranes of high porosity. Since 1974, more than 30 patients with chronic renal insufficiency have been treated with regular hemofiltration three times weekly for four to five hours each. After completing a pilot study, a controlled study to compare hemodialysis and hemofiltration was initiated during January, 1978. A normalization of blood pressure in patients with severe hypertension, and remarkable stability of the circulatory system, even after dehydration in patients who had hypotension in spite of fluid overload, could be demonstrated. Hemofiltration is preferred, especially in older patients with cardiovascular or cerebrovascular problems, because of its lower frequency of hypotensive episodes compared to dialysis. An important aim--the miniaturization of the artificial kidney--has not yet been achieved, however, because of the necessity for an extensive monitoring system for the exact proportioning of the sterile substitution fluid. First results in the application of a fluid regeneration system consising of a charcoal cartridge and a bioelectric cell, for degradation of urea, are presented.
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PMID:Clinical and technical aspects of hemofiltration. 3 39

We wish to determine what cellular and functional alterations are associated with the development of glomeruloscierosis when rats with one kidney are fed an excess of salt or protein. Rats with one kidney are more likely to develop pronteinuria and glomerulosclerosis than control animals. Blood pressure recordings indicate that proteinuria and glomerulosclerosis occur before hypertension is evident. Fluorescent antibody studies disclose that albumin accumulates in the epithelial cells of glomeruli and tubules. Ultrastructural examination shows that vacuolozation of epithelial cells and basement membrane thickening precede the sclerotic collapse of capillary loops. Increased concentrations of sodium or urea that are found in urines of these rats favor the point of view that an elevation of solute load when combined with a reduction of renal mass will on some unknown manner accelerate the deterioration of glomeruli.
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PMID:Protein overload nephropathy in rats with unilateral nephrectomy. A correlative light immunogluorescence and electron microscopical analysis. 4 49

Rats with unilateral nephrectomy were offered 1% sodium chloride as drinking fluid and were injected with desoxycorticosterone trimethylacetate (D.O.C.-T.M.A.) at weekly intervals. During the fourth to seventh week after the start of the experiment, malignant hypertension developed in most of the animals: body weight fell, reflecting volume depletion; serum osmolality and serum sodium and urea concentrations increased; in the kidneys malignant nephrosclerosis occurred. In such animals, plasma concentrations of arginine-vasopressin were increased ten-fold in comparison with control animals; intravenous injection of a specific vasopressin antibody resulted in a transient fall of blood-pressure (B.P.) to normal or subnormal levels, while the injection of an angiotensin-I or angiotensin-II antibody did not affect B.P. In control animals none of the antibodies had an effect on B.P. It is concluded that in the pathogenesis of malignant D.O.C. hypertension vasopressin plays a role similar to that of renin-angiotensin in malignant renal hypertension.
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PMID:Is vasopressin involved in the pathogenesis of malignant desoxycorticosterone hypertension in rats? 5 84

In this study naturally occurring hypertension in wild rhesus monkeys has been noted with a frequency of 13 out of 428 monkeys examined. The maximum systolic/diastolic blood pressure was 242/140 mm of Hg. Clinically there was evidence of grade I retinopathy in one case only, otherwise the animals did not manifest any symptom to suggest illness. Biochemical examination revealed normal plasma angiotensin activity but the level of serum sodium was slightly elevated. The serum potassium, blood urea and serum creatinine values were within normal limits. Serum cholesterol was, however, elevated in two cases. All hypertensive animals were sacrificed by exsanguination and a complete autopsy was performed. It revealed left ventricular hypertrophy in almost all cases, patchy myocardial degeneration with fibrosis in 3 animals and advanced renal disease only in 3 cases. It therefore appears that most of these cases of hypertension belonged to the idiopathic group.
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PMID:Spontaneously occurring hypertension in wild Rhesus monkeys. 15 Nov 70

18-hydroxy 11-deoxycorticosterone (18-OH DOC), a weak mineralocorticoid, was estimated by a radioimmunoassay procedure after purification in 49 patients with hypertension and 38 normal control subjects. The sensitivity of the method was 2-4 pg; there was no detectable blank, and the precision was 9-10%. In normal subjects the absolute plasma levels were similar to those of aldosterone. ACTH administration produced a 23-fold increase, and sodium restriction resulted in a 4-fold increase (5.4+/-0.7-20.5+/-3.0 ng/dl). On the other hand, the plasma levels of 18-OH DOC declined by nearly 50% with upright posture or angiotensin II infusion. During both of these procedures, plasma aldosterone levels significantly increased. Patients with normal and low renin hypertension had similar changes in plasma 18-OH DOC levels with sodium restriction. However, the mean high sodium level in the normal renin essential hypertension group (11.6+/-1.6 ng/dl) was significantly greater (P is less than 0.001) than in the control group (5.4+/-0.7 ng/dl). In addition, at least 22% and perhaps as high as 37% of the hypertensive subjects had levels greater than the upper limits of normal on a high sodium intake. Differences between the groups were less impressive in the sodium-restricted studies. There were no significant differences in age, duration of hypertension, sodium balance, serum sodium, potassium, or blood urea nitrogen in those patients who had elevated levels of plasma 18-OH DOC. Patients with primary aldosteronism had levels within the normal range on both dietary intake. However, in contrast to the other groups there were no significant changes in the plasma levels with sodium restriction. Thus, a significant number of patients with essential hypertension presumably have an alteration in 18-OH DOC secretion.
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PMID:The regulation of plasma 18-hydroxy 11-deoxycorticosterone in man. 18 59

Endocrine activity in patients with essential hypertension was studied by measuring the urinary excretion of catecholamines, prostaglandin E (PGE) and cyclic adenosine monophosphate (cAMP). Simultaneously, plasma renin activity, concentrations of serum sodium, potassium, blood urea nitrogen (BUN) and creatinine were determined. Systolic blood pressure and BUN increased progressively with age until the sixth decade. Urinary excretion of norepinephrine was correlated with the systolic blood pressure. In contrast, plasma renin activity and urinary excretion of PGE decreased progressively with the increase in systolic blood pressure. Although the cause of essential hypertension is not known, it is suggested that hypertension accelerates the aging process in the kidney and thus decreases renal PGE synthesis. This decrease of PGE in turn causes a reduction of plasma renin activity, possibly either by accelerating the retention of sodium and water or by failing to stimulate renin synthesis. A decrease of PGE may also potentiate the vasopressor action of norepinephrine.
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PMID:Changes in hormonal activities relative to the severity of essential hypertension. 21 51

Lipid and carbohydrate metabolism variables were studied in twenty-eight patients with chronic renal failure (mean GFR 7.7 +/- 2.5 ml/min) and uraemic symptoms. 71% of the patients had hypertriglyceridaemia (greater than or equal to 2.2 mmol/l). Total serum cholesterol was normal while VLDL cholesterol was high and alpha-lipoprotein cholesterol was low. The fractional elimination rate of Intralipid was low and inversely correlated to serum triglyceride levels. Intravenous glucose tolerance was reduced with normal or slightly increased fasting blood glucose and insulin values before and during the test. Serum triglycerides were correlated to plasma insulin but not to residual renal function or serum urea levels. The cause of hypertriglyceridaemia and lowering of alpha-Lp cholesterol is not unequivocally clear. Present evidence indicate that retarded catabloism of triglyceride-rich lipoproteins is important but accentuated release of triglyceride-rich lipoproteins may have occurred in a number of cases. The commonly used treatment with beta-blocking agents for hypertension in chronic renal failure may accentuate certain of the metabolic responses in uraemia.
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PMID:Lipid and carbohydrate metabolism in uraemia. 23 60

Radiation injury to arteries can represent a significant complication of therapeutic irradiation, even when the dosage used has not been excessive as judged by approved protocols. Children in whom therapeutic abdominal irradiation has been used should be monitored indefinitely for the development of hypertension. The presence of hypertension in such children with normal blood urea nitrogen (BUN) and creatinine, and without proteinuria, should prompt investigation for a renovascular lesion. Standard bypass procedures are usually effective, although the long-term success may be compromised by continuing changes in affected vessels.
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PMID:Postradiation renovascular hypertension. 23 3

Of 26,294 consecutive patients monitored in a comprehensive drug surveillance program, 1067 (4 per cent) received methyldopa for treatment of hypertension. Adverse reactions attributed to methyldopa were reported in 149 patients (14 per cent), the most frequent being hypotension. Life-threatening adverse effects were reported in nine patients (6 per cent of reactors)--the major problems being hypotension associated in several patients with signs of cardiac or cerebral ischemia. Hypotension attributed to methyldopa was more frequent in younger patients, in those with uremia, in lighter subjects, and in those receiving a high daily dose. Marked interaction between these factors was demonstrated and eightfold differences in the frequency of hypotension were observed in different sub-groups of methyldopa recipients. Adverse effects other than hypotension were reported infrequently and did not correlate well with the previously mentioned factors. The findings suggest that methyldopa therapy should be commenced cautiously in younger patients, in the non-obese, and in those with impairment of renal function as manifest by elevated blood urea nitrogen levels.
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PMID:Adverse reactions to methyldopa with particular reference to hypotension. 26 90


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