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

1. Hypertension produced in two-kidney Goldblatt dogs was accompanied by a transient fluid retention, reaching a maximum 4 days after clamping. 2. Prostaglandin E and F concentrations in venous blood from the intact kidney also rose transiently, showing a maximum by the fifth day. 3. The rise in prostaglandin release from the intact kidney may be related to the fluid retention.
Clin Sci Mol Med 1978 May
PMID:Renal prostaglandins in renal hypertensive dogs. 75 Jan 58

1. Patients with cadaveric renal transplants and plasma creatinine less than 177 micronmol/l who had their own kidneys removed were studied. 2. The renin-angiotensin system appeared to behave in a normal fashion in response to alterations in sodium intake and posture. 3. The renin-angiotensin system had no major role in the establishment or maintenance of hypertension. 4. Mean arterial pressure was directly related to expansion of the extracellular fluid volume.
Clin Sci Mol Med Suppl 1976 Dec
PMID:Plasma renin activity, plasma angiotensin II and extracellular fluid volume in patients after renal transplantation. 79 52

1. Noradrenaline, adrenaline and alpha-methylnoradrenaline administration into the nucleus tractus solitarii (NTS) of anaesthetized rats decreased blood pressure and heart rate in a dose-dependent fashion. 2. Bilateral injections were effective in lower doses than unilateral administration. alpha-Methylnoradrenaline given bilaterally produced hypotension in a dose of 0-08 nmol whereas after unilateral injection a dose of 0-32 nmol was needed to obtain the same degree of hypotension. 3. Electrical stimulation of the NTS caused hypotension and bradycardia. Conversely, bilateral electrolytic lesions or deafferentation of the NTS led to acute hypertension. Chronically such lesions caused neurogenic hypertension. 4. In spontaneously hypertensive rats increased concentrations of noradrenaline, adrenaline and dopamine were measured in the part of the NTS located just caudal to the obex (A2 region).
Clin Sci Mol Med Suppl 1976 Dec
PMID:Brain-stem structures and catecholamines in the control of arterial blood pressure in the rat. 79 55

1. The interactions of dopamine, reserpine and methyldopa on blood pressure of normal subjects and of those with essential hypertension were examined. 2. When biosynthesis of noradrenaline from dopamine was blocked by reserpine, dopamine induced a prominent depressor effect in essential hypertension. 3. The long-term treatment with methyldopa induced a marked potentiateion of the pressor action of domapine in hypertension, although no significant pressor response was found in normal subjects. 4. It is suggested that methylnoradrenaline may accumulate in peripheral nerve endings of patients with essential hypertension in comparison with normal subjects, and this accumulated methylnoradrenaline potentiates the pressor response to dopamine in essential hypertension.
Clin Sci Mol Med Suppl 1976 Dec
PMID:Interaction of dopamine, methyldopa and reserpine in the sympatho-adrenal system in essential hypertension. 79 57

1. A double-blind cross-over evaluation of the anti-hypertensive effect of metoprolol vs placebo was carried out in a series of twenty-three patients with mild or moderate essential hypertension who were receiving 25 mg of chlorthalidone daily as their basic treatment. An individually determined dose of metoprolol (75-300 mg) was used. 2. Metoprolol, as compared with placebo, produced a statistically significant reduction of blood pressure, both in supine and standing positions. 3. During the double-blind cross-over study mild side effects were more common at the beginning of metoprolol/chlorthalidone treatment than during placebo/chlorthalidone, but these tended to diminish or disappear with time. 4. Metoprolol in combination with chlorathalidone appears to be an effective and well-tolerated treatment for mild and moderate hypertension in patients not responding to chlorthalidone alone.
Clin Sci Mol Med Suppl 1976 Dec
PMID:A controlled study on the anti-hypertensive effect of a new beta-adrenoreceptor-blocking drug, metoprolol, in combination with chlorthalidone. 79 61

The pilot phase of the British multicentre randomized controlled trial of treatment for mild hypertension has shown: (1) that unselected subjects, aged 35-64 years, with mild hypertension are willing to enter and remain in a long-term trial even though asymptomatic; (2) that the differences of mean systolic and mean diastolic pressure achieved between treated and control subjects is sufficient to produce the expected difference in terminating events with the 18000 patients calculated as needed for the full-scale trial; (3) that side effects with the two selected active primary regimens (bendrofluazide and propranolol) are common but mild (no serious side effects or toxic reactions have been reported); (4) that the work load imposed by the trial, though considerable during screening and the initiation of patients into the trial, can largely be taken by specially trained nursing staff, and when screening is completed the trial does not impose a heavy burden of follow-up examinations; (5) that there are no adverse psychological effects caused by alerting asymptomatic people to their raised pressure and enrolling them into a prolonged programme of clinical attendance; (6) that the total costs of carrying out a full-scale trial--estimated at about lb.2m ($U.S. 4m)--are commensurate with the potential annual savings in health service expenditure whether the trial shows treatment to be effective or unwarranted.
Clin Sci Mol Med Suppl 1976 Dec
PMID:Medical Research Council's Treatment Trial for mild hypertension: an interim report. 79 65

1. Twenty patients with severe or moderate hypertension were treated with minoxidil for 284 patient-months. 2. The blood pressure was controlled in all patients, including those refractory to maximal doses of conventional anti-hypertensive agents. 3. In patients with moderate hypertension control with minoxidil was achieved earlier and more easily than with hydrallazine. 4. Three patients developed secondary resistance and required addition of guanethidine or increased doses of diuretics. 5. Fluid retention and hypertrichosis were the main side effects with minoxidil.
Clin Sci Mol Med Suppl 1976 Dec
PMID:Treatment of severe and moderate hypertension with minoxidil: experience in twenty-eight patients. 79 67

1. L6150 is a highly effective vasodilator which produces an acute reduction of blood pressure when administered intravenously. 2. This is due entirely to a decrease in total peripheral vascular resistance. 3. On oral administration it can effectively lower blood pressure in mild hypertension and is effective in combination with other hypotensive agents with different mechanisms of action.
Clin Sci Mol Med Suppl 1976 Dec
PMID:Clinical and haemodynamic study of a new vasodilator drug L6150 (3-[bis-(2-hydroxyethyl)amino]-6-hydrazinopyridazine) in man. 79 68

Consideration of the results obtained in studies of spontaneously hypertensive rats indicates that these animals can serve as useful models for perhaps the most common type of essential hypertension of man. Other variants of essential hypertension probably occur where the relative balance between the genetic elements predisposing to high blood pressure may be somewhat different.
Clin Sci Mol Med Suppl 1975 Jun
PMID:Central neurohormonal mechanisms in spontaneously hypertensive rats compared with human essential hypertension. 80 37

1. Some of the haemodynamic abnormalities in mild (borderline) human hypertension appear to be neurogenic, since they can be completely abolished by pharmacological autonomic blockade. 2. The cardiac output is elevated in 30% of patients through increased sympathetic drive and decreased parasympathetic inhibition. 3. In the remainder, the higher blood pressure is maintained by increased total peripheral vascular resistance. 4. In approximately 30% of this latter group, the higher vascular resistance is maintained solely by increased alpha-adrenergic tone. 5. Elevated plasma renin activities in a proportion of cases are probably due to generalized increase in sympathetic nervous activity. 6. Patients with mild hypertension thus show increased sympathetic drive to the heart and arterioles as well as decreased cardiac parasympathetic inhibition. It is presumed that the increased plasma renin is also neurogenic. 7. Such a widespread distribution of altered autonomic tone suggests aberration of the function of the integrative centres of cardiovascular control. 8. Evidence is presented of a possible psychosomatic origin of these changes in some cases.
Clin Sci Mol Med Suppl 1975 Jun
PMID:Role of the autonomic nervous system in mild human hypertension. 80 40


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