Biomedical subjects
Publications and source records attributed to H Berent.
Explore the source record for details and available documents.
Explore the source record for details and available documents.
Explore the source record for details and available documents.
Explore the source record for details and available documents.
Explore the source record for details and available documents.
In 106 patients with essential hypertension and different plasma renin activity several hormonal and metabolic factors were studied: urinary excretion of catecholamines, blood levels of cholesterol and triglycerides, levels of glycaemia and insulinaemia after glucose load and plasma fibrinolytic activity. The plasma renin activity in 46.2 percent of patients was normal, whereas in 25.5 percent it was low, and in 28.3 percent it was high. In patients with high plasma renin activity the excretion of noradrenaline and adrenaline was relatively high while that of dopamine was low. Significantly lower triglyceride levels were found in patients with low plasma renin activity in comparison with those with high and normal plasma renin activity. There was also a statistically significant difference in the euglobulin lysis time which was shorter in patients with low and longest in patients with normal plasma renin activity. The results of the study show that patients with different plasma renin activity may also differ in some hormonal and metabolic values.
Explore the source record for details and available documents.
Explore the source record for details and available documents.
Explore the source record for details and available documents.
Explore the source record for details and available documents.
Explore the source record for details and available documents.
Explore the source record for details and available documents.
Explore the source record for details and available documents.
Explore the source record for details and available documents.
The studies included 14 patients with pheochromocytoma (mean age 39.5 years), 32 patients with arterial hypertension (mean age 39.5 years), and 9 healthy volunteers (mean age 39.5 years). Free and conjugated noradrenaline and adrenaline in blood platelets have been assayed with RIA technique. It was shown that mean concentrations of conjugated noradrenaline and adrenaline in blood platelets are significantly higher in patients with pheochromocytoma than those in hypertensive patients and healthy individuals. However, such test may be used with limitations as there is high percentage of increased values in patients with the primary arterial hypertension. A decreased noradrenaline inactivation in blood platelets of patients with pheochromocytoma has also been observed. This may exert some effect on the diversified clinical course of this type of arterial hypertension.
An effect of the treatment with guanfacine on the activity of the adreno-sympathetic system, beta-thromboglobulin, beta-endorphin, and blood lipids was studied in 30 patients with the primary arterial blood hypertension. It was found that guanfacine significantly decreases plasma noradrenaline, adrenaline, and dopamine. Moreover, it decreases the excretion of noradrenaline, adrenaline and 4-hydroxy-3-methoxy-phenylglycol. These effects correlate with the drop in both systolic and diastolic blood pressure. A decrease in plasma renin activity was also observed. It correlated with the blood pressure drops. Guanfacine increased beta-endorphin levels while beta-thromboglobulin, total cholesterol and triglycerides levels remained unaffected. The authors suggest that the hypotensive effect of guanfacine is related to the decrease in adreno-sympathetic system activity and plasma renin activity and no effect on the erythrocyte activity and lipids metabolism.
The studies involved 22 patients with borderline hypertension and familial history of the arterial blood hypertension (mean age 24.6 years) and 9 patients without familial history of hypertension (mean age 22.2 years). Control group included 10 healthy volunteers (mean age 27.5 years). Erythrocyte Na+ and K+ levels, daily secretion of noradrenaline (NA), adrenaline (A) and dopamine (DA), prostacyclin metabolite 6-keto-PGF1 alpha, beta-thromboglobulin levels (beta-TG), triglyceride cholesterol, and HDL-cholesterol were determined in all examined subjects. Friedewald's equation was used to calculate LDL-cholesterol. Moreover, LCAT activity was measured. An increase in erythrocyte Na+, increased sympathetic activity, excessive platelet activity and decreased 6-keto-PGF1 alpha levels were found in the group of hypertensive patients with familial history of the arterial blood hypertension. HDL-cholesterol was significantly lower in these patients than in the control group. Atherogenic index (cholesterol/HDL-cholesterol ratio) was the highest in the hypertensive patients with familial history of the arterial blood hypertension. The difference was insignificant, however. Patients with the borderline hypertension and familial predisposition to this disease differ from the hypertensive patients without familial history of the arterial hypertension in humoral profile suggesting a contribution of the genetic factors to the development of the arterial blood hypertension.
Explore the source record for details and available documents.