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Biomedical subjects

G Berglund

Publications and source records attributed to G Berglund.

At least 253 records · Page 14Linked to original sources
PubMed1982

Blood pressure in relation to the renin-angiotensin-aldosterone system.

The relationship between blood pressure (BP) and the renin-angiotensin-aldosterone system was studied in a stratified random sample (n=120) of 49-year-old men selected from a BP screening and covering a wide range of BPs. Only subjects not on antihypertensive treatment were included. None had malignant or secondary hypertension. Plasma renin activity, plasma concentrations of angiotensin II, aldosterone, sodium, potassium and noradrenaline and the 24-hour urinary excretions of sodium, cortisol and noradrenaline were determined. Of these variables, only p-aldosterone was significantly correlated wtih BP, both in the whole study group (R=0.22, p less than 0.02, n=119) and in the subjects with the highest BP range (R=0.36, p less than 0.02, n=30). Of the clinical groups compared, the hypertensive subjects had significantly higher mean p-aldosterone than the borderline and normotensive subjects. Multiple regression analysis showed that the 24-hour urinary excretion of noradrenaline was the factor most strongly correlated to p-aldosterone, suggesting that the sympathetic nervous system might stimulate aldosterone secretion. Our findings indicate that aldosterone may be of importance for the development and maintenance of essential hypertension.

Aldosterone↗
PubMed1982

Sodium balance during development of hypertension in the spontaneously hypertensive rat (SHR).

Sodium balance was studied in 7 and 16 week old male spontaneously hypertensive rats (SHR), in matched normotensive Wistar rats (NCR) and in Wistar Kyoto rats (WKR). The animals were placed in metabolic cages and given diets with either normal sodium content (5.35 mmol sodium/100 g food) or with a sodium content 3 or 10 times the normal. Whether on normal or increased sodium diet we did not observe any increased sodium retention in either SHR age group. However, in both SHR groups urinary sodium excretion was correspondingly increased compared with the controls. This shift of sodium excretion from kidneys to gastrointestinal tract in SHR did not reflect any 'primary' inability of the SHR kidneys to excrete sufficient sodium amounts since on high sodium diet they excreted the increased sodium load as readily as the normotensive controls. The present results do not support the concept that a primary renal retention of sodium and water should be of pathogenetic importance for the SHR variant of primary hypertension.

Age Factors↗
PubMed1982

Hormonal pattern during development of hypertension in spontaneously hypertensive rats (SHR).

Urinary excretion of sodium, noradrenaline, dopamine, aldosterone, prostaglandin E2 and plasma renin activity were determined in 7 and 16 weeks old spontaneously hypertensive rats (SHR) and in two normotensive control strains, ordinary Wistar control rats (NCR) and Wistar-Kyoto normotensive rats (WKR). Each group consisted of 10-11 rats. The animals were kept in metabolic cages. Experiments were performed on standard diet (5-8 mmol Na+/100 g food) and with an increased (15.6 and 56.0 mmol Na+/100 g food) salt intake. At 7 weeks of age, when SHR are in a borderline phase of hypertension, they exhibited a decreased urinary sodium excretion, and an increased urinary noradrenaline excretion compared to controls. The latter might reflect an increased overall activity of the sympathetic nervous system. Urinary dopamine excretion was also increased probably mirroring a higher activity in a renal natriuretic dopamine system. Plasma renin activity and urinary aldosterone excretion were depressed. At 16 weeks of age, when SHR are in an early establishment phase of hypertension, urinary sodium excretion was still lower in SHR, while urinary noradrenaline and dopamine excretions had become normal compared to controls. Plasma renin activity and urinary aldosterone excretion remained depressed. Urinary PGE2 excretion, only determined in this age group, was significantly higher in SHR.

Aldosterone↗
PubMed1981

beta-blockers or diuretics in hypertension? A six year follow-up of blood pressure and metabolic side effects.

The antihypertensive effect and metabolic side effects of bendroflumethiazide have been compared with those of propranolol in two randomly selected groups, of 53 previously untreated middle-aged men during 6 years' treatment for mild to moderately severe essential hypertension. The blood pressure-reduction was the same in the two groups. During the follow-up 1 man in the bendroflumethiazide group and 3 in the propranolol group died while 2, 1 on each treatment, became diabetic. None had gout but serum urate increased in both groups. Glucose tolerance improved significantly in both groups during the first year and this improvement was sustained for the follow-up period. Serum potassium did not differ in the two groups during the first 5 years but during the sixth year it decreased in the diuretic group. Total potassium was, however, unchanged in both groups. These results indicate that the frequency of metabolic side effects during diuretic treatment of mild to moderately severe essential hypertension is low and has been grossly exaggerated. Since the antihypertensive effect and side effects were equal with both drugs, and since the diuretics are cheaper, they should be the drug of first choice in this type of hypertension.

Adrenergic beta-Antagonists↗
PubMed1981

Sotalol and metoprolol comparison of their anti-hypertensive effect.

28 patients, aged 35-62 years, with uncomplicated hypertension, entered a double-blind, crossover study, in which the effects of single daily doses of sotalol and metoprolol were compared. Both drugs exerted a clinically useful anti-hypertensive effect as monotherapy, or in combination with a thiazide diuretic. No significant difference in hypotensive effects was noted between the two beta-blocking agents, when the dose was titrated to an optimal clinical effect. Treatment with sotalol and metoprolol was associated with a clinically insignificant increase in serum uric acid concentration. The side-effects observed were few, and in only two cases was therapy discontinued. We regard both sotalol and metoprolol as useful anti-hypertensive drugs.

Adult↗
PubMed1981

Intra-erythrocyte sodium and (Na+,K+-activated)-ATPase concentration and urinary aldosterone excretion in spontaneously hypertensive rats.

1. Intra-erythrocyte sodium, potassium, ATP and (Na+,K+-activated)-ATPase concentrations and urinary aldosterone excretion were compared in 3-month-old spontaneously hypertensive rats (n = 11) and normotensive Wistar-Kyoto control rats (n = 11). 2. Spontaneously hypertensive rats exhibited significantly higher intra-erythrocyte sodium concentration (5.5 +/- 1.3 vs 4.0 +/- 1.1 mmol/l of erythrocytes, P less than 0.01). No significant difference was found in intra-erythrocyte potassium. ATP or (Na+,K+-activated)-ATPase concentration. 3. Mean urinary aldosterone excretion was significantly lower in spontaneously hypertensive rats (66.3 +/- 6.5 pmol/24 h) than in Wistar-Kyoto rats (90.5 +/- 10.6 pmol/24 h, P less than 0.01). No significant relationship between urinary aldosterone and intra-erythrocyte sodium concentration was found in spontaneously hypertensive or Wistar-Kyoto rats or in the pooled group. 4. These results are thus consistent with previous findings of an increased intracellular sodium concentration in spontaneously hypertensive rats, but do not support the hypothesis that aldosterone is a dominant regulator of intracellular sodium concentration.

Adenosine Triphosphate↗
PubMed1981

Blood pressure and the renin--angiotensin--aldosterone system.

1. The relationships between blood pressure and the components of the renin--angiotensin--aldosterone system were studied in 49-year-old men (n = 120) who were selected at random from the total population so as to be representative of all blood pressure levels. 2. Only plasma aldosterone concentration was significantly correlated with blood pressure, both in the whole study group (r = 0.22; P less than 0.02) and in the hypertensive blood pressure range (r = 0.36; P less than 0.02). The hypertensive subjects had a significantly higher plasma aldosterone concentration than the borderline and normotensive subjects. 3. Multiple regression analysis including factors related to the renin--angiotensin--aldosterone system, showed that the 24 h urinary excretion of noradrenaline was the factor most strongly correlated to plasma aldosterone. 4. The findings indicate that aldosterone may be the most important component of the renin--angiotensin--aldosterone system in the development and maintenance of essential hypertension.

Aldosterone↗
PubMed1981

Body composition, metabolic and hormonal characteristics in unselected male hypertensives.

Body composition, glucose metabolism and indices of sympathetic nervous activity were studied in two different samples of unselected normotensive and hypertensive middle-aged men. The hypertensive subjects were more often obese and had more often an impaired glucose tolerance and a higher fasting insulin compared with the normotensives. The metabolic differences were not explained simply by the higher degree of obesity in the hypertensives, but seemed also to be related to an increased excretion of noradrenaline, ie to an increased overall sympathetic activity. The impaired glucose metabolism might be one of the factors explaining the variable prognosis in essential hypertension.

Adipose Tissue↗
PubMed1980

Pharmacokinetics of sotalol after chronic administration to patients with renal insufficiency.

Ten hypertensive patients with modern to severe impairment of renal function were treated with sotalol for 5 to 10 weeks (average 6.4 weeks). Dosage was individually titrated (range 80 to 480 mg daily). The drug was given once daily in the morning. In eight patients blood pressure was satisfactorily controlled. Higher steady-state levels were observed than have been reported after similar doses in patients with normal renal function. The apparent first-order elimination rate constant and plasma clearance were significantly correlated with glomerular filtration rate. For an anuric patient, serum half-life was calculated to be 69 h. In relation to the raised plasma levels, side effects were uncommon. Since sotalol is excreted predominantly via the kidney, therapy in patients with impaired renal function should start with a low dose and any increase in dosage should be made carefully. As the anti-hypertensive effect does not appear to be correlated with the plasma level or with tolerance, adjustment of dose should be based on clinical response.

Aged↗
PubMed1980

Blood pressure and renal function.

The relationship between blood pressure (BP) and renal function was studied in samples of 49-year-old men. Of 3 205 49-year-old men, 2 376 (74%) took part in a BP screening. By systematic sampling, based on diastolic BP levels varying from very low to very high, 120 subjects were selected for this study. Only subjects who were not on antihypertensive treatment were included. Renal blood flow (RBF), renovascular resistance (RVR), glomerular filtration rate (GFR), filtration fraction (FF) and renal concentrating capacity were studied in 111 subjects, none of whom had advanced hypertension. With increasing BP there was a decrease in RBF (r = -0.34) and an increase in RVR (r = 0.81) and FF (r = 0.35). The changes in renal haemodynamics occurred gradually from low to high BP, and did not start at any particular BP level. With increasing BP, GFR was unchanged. An "autoregulation of GFR" was thus found at all BP levels studied. Renal concentrating capacity was unchanged. These findings indicate that renal haemodynamics in essential hypertension are adjusted mainly to ensure a constant GFR.

Blood Pressure↗
PubMed1979

Stroke registration in Göteborg, Sweden, 1970-75. Incidence and fatality rates.

Strokes occurring among persons between 15 and 65 years of age (population 300 000) have been registered since 1970 in Göteborg, Sweden. Control of the validity showed that less than 10% of all cases of stroke were undetected. During the period Nov. 15, 1970-May 14, 1975, 986 stroke events occurred in 941 patients, giving an annual average incidence rate of 73 (89 for men and 58 for women) per 100 000 individuals 15-65 years of age. The incidence for all ages was estimated to be about 200/100 000. The rates were higher for men than for women in all age groups. There was a female preponderance for subarachnoid haemorrhage but a male preponderance for other types of stroke. Incidence rates increased with age, most rapidly for brain infarcts and unspecified stroke. Fatality rates levelled out 3 weeks after onset of stroke; they were high for subarachnoid and intracerebral haemorrhage and low for cerebral infarction and unspecified stroke. Incidence rates were lower than those found in two similar studies from Denmark and Finland, and even greater variations were found with respect to types of stroke. Fatality rates were similar to those reported by other authors.

Adolescent↗
PubMed1979

Effect of treatment of hypertension in the primary preventive trial, Göteborg, Sweden.

1 A treatment group comprising 635 hypertensive men (casual SBP greater than 175 or DBP greater than 115 twice) was compared with a reference group (n = 391 men; casual SBP greater than 175 or DBP greater than 115 only at screening). All men belonged to the same population sample of 7,455 men aged 47-54 yr. 2 The two groups did not differ with respect to age, smoking habits or cholesterol values, but screening BPs were higher in the treatment group. 3 During 4.3 years' follow-up there was a significantly lower total death rate in the treatment group compared with reference group. 4 There was also a strong tendency towards lower incidence of non-fatal myocardial infarction (P = 0.06). The pooled incidence of non-fatal myocardial infarction and fatal CHD was lower in the treatment group than in the reference group (P less than 0.03).

Adrenergic beta-Antagonists↗