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

Cross-clamping of the ascending aorta in dogs for 15 min produced severe neurological deficit, observed for up to 20 h. Immediately after restoration of the circulation, the intracranial pressure in the cisterna magna increased transiently to a mean peak of 22.8 Torr (SD +/- 1.7) because of a compensatory increase in systemic arterial pressure, without a fall in cerebral perfusion pressure. The intracranial pressure returned to control values 15-30 min after ischaemia and showed no secondary rise during the 8 h of observation. The electroencephalogram became isoelectric 34 +/- 6.5 s (mean +/-SD) after circulatory occlusion, and was abnormal when it reappeared 5 h 36 min (SD +/- 2 h 4 min) after the circulation was restored. The electrical impedance of the brain increased immediately after ischaemia and returned rapidly towards pre-ischaemic values during re-perfusion. The cerebral water had not increased measurably 4 h after ischaemia. After ischaemia, the lactate concentration in the cerebrospinal fluid increased to 4.7 mequiv./1(SEM +/-0.1) and the pH decreased to 7.17 (SEM +/-0.02); both returned to control values after 3.5 h. The cerebral glucose uptake was decreased 35 min after ischaemia, cerebral oxygen uptake remained unchanged but cerebral blood flow decreased (P less than 0.05 at 90 min). Immediately after cardiac arrest, recovery was impaired more by the presence of focal abnormal brain perfusion than by intracranial hypertension.
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PMID:Total brain ischaemia in dogs: cerebral physiological and metabolic changes after 15 minutes of circulatory arrest. 0 Jul 50

The effect of insulin-induced hypoglycemia on the blood levels of catecholamines and renin activity has been studied in five patients with moderate hypertension before and after treatment for 3 - 8 months with penbutolol (PEN) 20 - 30 mg twice daily. Penbutolol caused no change in fasting blood glucose level. Insulin o.1 IU per kg body weight i.v. reduced blood glucose concentration by approximately 50 per cent after 30 - 45 min, both before and during treatment with penbutolol. Hypoglycemia prior to medication was accompanied by a marked increase in the production of adrenaline and a minor increase of noradrenaline in all five patients. During treatment the response of adrenaline to hypoglycemia was reduced in four patients and the data was inconclusive in one. Basal renin activity was rather low in three patients, within the normal range in one and relatively high in one. Before penbutolol the hypoglycemia-induced increase in catecholamine production caused no change in plasma renin activity in the three patients with low basal levels, whereas a marked increase was observed in the other two. During medication plasma renin activity remained unchanged on induction of hypoglycemia regardless of the catecholamine response. Despite the marked increase in plasma adrenaline following insulin-induced hypoglycemia, no statistically significant increase in pulse rate was recorded.
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PMID:Long term treatment of moderate hypertension with penbutolol (Hoe 893d). II. Effect on the response of plasma catecholamines and plasma renin activity to insulin-induced hypoglycemia. 0 1

The object of this study was to establish whether cardioselectivity of atenolol confers any advantage over noncardioselective beta-blockade in the treatment of hypertension. A dose of atenolol was established on the basis of morning mean systolic blood pressure (mean of 5 readings) in 27 long-standing hypertensive patients previously controlled on one of three nonselective beta-blockers: propranolol, oxprenolol, or pindolol. Most patients were also taking a diuretic. A crossover trial was then conducted of atenolol and the previous nonselective beta-blocker, each drug being given for 8 wk in randomized order. Other drugs were kept constant. At the end of each 8-wk period a morning test of blood pressure and pulse rate was done, an 11:30 A.M. blood sample was taken for estimation of drug concentration, and spirometry was performed. During the eighth week a glucose tolerance test, fasting lipids, and other biochemical and hematologic estimations were done. On a separate occasion a late morning study was done on the response of blood pressure and pulse rate to three kinds of stress: bicycle ergometer, mental arithmetic, and handgrip. At dosage levels of atenolol giving a mean resting systolic blood pressure equal to that during nonselective beta-blockade, diastolic levels on atenolol tended to be lower at rest and during the mental and handgrip forms of stress. Serum creatinine levels on atenolol were lower than during nonselective beta-blockade. Anti-dioxyribonucleic acid (DNA) titers remained normal in all patients. There was no difference in lung function. There was little difference in glucose and insulin levels during glucose tolerance tests in these patients, half of whom were diabetic. There were no serious side effects but there were a few surprising ones such as vivid dreams in three and muscle cramps in one patient.
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PMID:Atenolol and three nonselective beta-blockers in hypertension. 3 Dec 59

A reversible deterioration of the oral glucose tolerance has been reported in subjects with initially impaired glucose tolerance when starting to take oral diuretics. This does not seem to be the case in subjects with an initially unimpaired glucose tolerance. A deterioration in the diabetic state is commonly seen when diuretics are given to subjects with clinical diabetes. Our knowledge about the effect of beta-blockers on the glucose tolerance is limited. As for diuretics there seems to be an overrepresentation of diabetics among subjects taking beta-blockers. This overrepresentation can probably be explained by an association between diabetes and disturbances in which diuretics and beta-blockers are commonly used such as arterial hypertension and ischaemic heart disease.
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PMID:Impairment of glucose metabolism during treatment with antihypertensive drugs. 3 6

Twenty-three patients with stage III germinal neoplasia of the testis were treated with a variation of our original vinblastine-bleomycin program. This modification consisted of 0.4 mg/kg of vinblastine given in two fractions on Days 1 and 2 followed by continuous intravenous administration of 30 units of bleomycin in 1000 cc of 5% glucose and distilled water over a 24-hour period for 5 successive days beginning on Day 2. Therapy was repeated every 28-35 days as toxicity permitted. There were 17 responses, nine of which were complete (39%). Eight of the complete responses were in patients with massive disease in whom a low complete response rate was expected. Toxic effects consisted of severe leukopenia in 90% thrombopenia in 50%, and unexplained transient hyperbilirubinemia in about 30% of the patients. Bleomycin pneumonitis occurred in one patient and resulted in death. Hypertension was a new and unexpected side reaction experienced by four patients. Further trials are indicated since the complete response rate in patients with advanced massive disease appears to be improved.
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PMID:Continuous intravenous bleomycin (NSC-125066) therapy with vinblastine (NSC-49842) in stage III testicular neoplasia. 5 12

Spontaneously hypertensive rats (SHR), aged 10 weeks, and rats with renovascular hypertension (25-30 weeks) demonstrated, in contrast to the controls, a different pattern of erythrocytes staining with paraldehyde-fuchsin used in histochemistry for demonstrating glycoproteids. The erythrocytes were found to respond to intravenous glucose injections by changing the optic density. The erythrocytes response of SHR differs from the normals, but no difference was revealed in rats with renovascular hypertension. The authors suggest that the changes in the tinctorial properties of the erythrocytes with reference to paraldehyde-fuchsin indirectly reflect the state of the insulin receptors of the erythrocyte membrane.
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PMID:[Cytospectrophotometric study of glycoproteins of the erythrocyte membrane in renal and spontaneous hypertension in rats]. 6 44

The activities of the Na+--K+-ATPase, succinic dehydrogenase (SDH/, lactic dehydrogenase (LDH/ and glucose-6-phosphat dehydrogenase (G-6-PDH/ were studied in the cortex outer and inner medulla of the kidneys of rats with spontaneous hypertension (SHR) and were compared with those of control normotensive Wistar rats. The SHR aged 6--8 weeks had durint the prehypertensive and the early hypertensive stage the same enzymatic activities as control rats. Rats with a steady SH aged 16-22 weeks had low specific activity of the, Na+--K+-ATPase, SDH and LDH in the outer medulla. The latter can be associated with decreased intensity of the energy metabolism and a reduction of the active sodium transport in the ascending limb of the loop of Henle in the SHR rats and cold cause the phenomenon of exaggerated natriuresis characteristic of hypertension.
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PMID:[Na+--K+-adenosine triphosphatase and some oxidoreductases in the kidney of rats with spontaneous hypertension]. 12 6

The clinical, hemodynamic, and angiographic findings were correlated with the heart size in 207 patients with proved coronary artery disease. Cardiomegaly was noted in 34 patients and normal heart size in 173. In these two groups, the patients' age range, duration of disease, and history of myocardial infarction were similar. There was no statistical difference in incidence of shortness of breath, hypertension, left ventricular hypertrophy, or abnormal glucose tolerance. Patients with cardiomegaly had a significantly higher incidence of congestive heart failure (26 per cent) as compared to patients with normal heart size (2.9 per cent) (P less than 0.001). Patients with enlarged heart presented a high incidence of anterior wall or multiple myocardial infarction (73 per cent) (P less than 0.001). The cardiomegaly group had a high incidence of elevated end-diastolic volumes, elevated end-diastolic pressures, and diminished ejection fractions when compared to patients with normal heart size (P less than 0.01). Double and triple coronary artery disease was more frequent in patients with cardiomegaly and total coronary score was also higher in this group (P less than 0.005). Asynergy was present in 55 per cent of patients with normal heart size but in 82 per cent of those with enlarged hearts (P less than 0.01). The group of patients with cardiomegaly and documented congestive heart failure had ejection fractions less than 0.30. Cardiac catheterization is probably not advisable in these patients in the absence of associated significant mitral regurgitation, ventricular septal defect, or ventricular aneurysm.
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PMID:Correlation of heart size with clinical and hemodynamic findings in patients with coronary artery disease. 12 83

The frequency of latent disorders of glucose regulation during pheochromocytoma, is evaluated at 75% of cases. Detailed analysis of 83 cases with a diabetic state, gave the following results: insulin dependent diabetes, 37 cases. Non-insulin dependent, 14 cases. Latent diabetes, 32 cases. The characteristics of the insulin-dependent diabetes were not always suggestive. Insulin dependency was, however, unusual above a certain age. We noted loss of weight in spite of good control of the diabetes, the absence of acidosis and ketosis contrasting with rapid loss of weight. In fact, it is above all the hypertension which should lead to diagnosis. Surgical operation, cures or improves considerably the diabetic state, thus proving the symptomatic nature of this diabetes.
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PMID:[Diabetes mellitus in pheochromocytoma]. 18 6

Male and female, nonarteriosclerotic (virgin) and arteriosclerotic (breeder), Sprague-Dawley rats were subjected to the hypertension-producing regimen of uninephrectomy, 1% saline drinking water, and desoxycorticosterone (Percorten) pivalate. Just before autopsy, some of the animals were given a single injection of corticotropin. The acute challenge of corticotropin caused a definite increase in free fatty acids, systolic blood pressure, creatine phosphokinase, glucose, and corticosterone. The two weeks of desoxycorticosterone and 1% saline-induced hypertension caused myocarditis and hyalinization of the coronary arteries of the nonarteriosclerotic (virgin) rats and definite exacerbation of the preexisting arteriosclerosis in breeder rats, severe myocarditis, and polyarteritis nodosa. All of the treated animals manifested lipid depletion of the zona glomerulosa indicative of reduced biosynthesis and secretion of endogenous mineralocorticoids due to the exogenous desoxycorticosterone and saline treatment.
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PMID:Corticotropin stimulation of hypertensive rats with and without arteriosclerosis. 21 53


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