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  • 1
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    German Medical Science; Düsseldorf, Köln
    In:  Hypertonie 2005; 29. Wissenschaftlicher Kongress der Deutschen Hochdruckliga; 20051123-20051125; Berlin; DOC05hochP115 /20060808/
    Publication Date: 2006-08-09
    Keywords: ddc: 610
    Language: English
    Type: conferenceObject
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  • 2
    ISSN: 0300-9084
    Keywords: lymphocyte ; p56^l^c^k ; phosphorylation ; tyrosine protein kinase ; vanadate
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Biochimie 56 (1974), S. 741-749 
    ISSN: 0300-9084
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1432-1041
    Keywords: nitrendipine ; acebutolol ; hypertension ; blacks
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary The short-term efficacy of nitrendipine (N) as a first stage antihypertensive drug in black patients has been assessed and compared with acebutolol (A) in a double-blind study. Forty patients were randomized and after a 4 week run-in period on placebo, the active treatment was administered for 6 weeks starting with 20 mg N or 200 mg A once daily. The dose was increased up to 60 mg N or 600 mg A as needed. Nitrendipine appeared to be more efficient than acebutolol in reducing blood pressure and the N-induced fall in blood pressure was achieved after 2 weeks. After 2 and 6 weeks on N, the recumbent blood pressure was decreased by 13% and 12% for the systolic and by 14% and 11% for the diastolic pressure. The concurrent decreases in the A group averaged 4% and 5% for the systolic and 5% and 10% for the diastolic pressure after 2 and 6 weeks. Pulse rate and plasma renin activity in the N group were slightly increased and body weight was decreased at the end of the active treatment period.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1432-1041
    Keywords: isradipine ; hypertension ; blood pressure ; calcium entry blockade ; renin angiotensin system ; aldosterone plasma renin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary The effects of acute calcium entry blockade by isradipine (IS) and placebo (P) on the haemodynamic and humoral responses to angiotensin II (A II) have been compared in two groups of 9 patients with essential hypertension. During 4 sequential periods each of 20 min, an i.v. infusion of A II 0, 2, 4 and 8 ng · kg−1 · min−1 was given before (control) and 30 min after the oral administration either of IS or P. After IS, both the blood pressure and the angiotensin II-induced pressor effect were significantly reduced. Isradipine increased the heart rate and this cardio-acceleration was potentiated by A II. In contrast, when A II was infused in the absence of IS, heart rate tended to decrease. IS stimulated plasma renin activity and reduced plasma aldosterone. However, it did not affect either the inhibition of plasma renin activity or the rise in plasma aldosterone in response to A II. In conclusion, acute calcium entry blockade in patients with essential hypertension reduces the pressor response to A II, but not the A II-induced inhibition of renin and increase in plasma aldosterone.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1432-1041
    Keywords: cromakalim ; erythrocyte potassium ; potassium transport system ; renin-angiotensin-aldosterone system ; catecholamines ; atrial natriuretic peptide
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary The effect of cromakalim, a K+-channel activator, on the plasma renin-angiotensin-aldosterone system, catecholamines and α-atrial natriuretic peptide, and on the intraerythrocyte concentration and transmembrane fluxes of Na+ and K+ has been investigated in 18 normal male subjects, in a double-blind parallel study. After a run-in period on placebo for 1 week, the subjects were treated either with placebo (n=6) or cromakalim (n=12) for 1 week. Plasma renin activity was significantly increased during cromakalim. No effect of cromakalim on plasma angiotensin II, aldosterone, adrenaline, noradrenaline and α-atrial natriuretic peptide was demonstrated. The intra-erythrocyte K+ concentration was decreased during cromakalim administration and Ca2+-dependent K+-channels in red blood cells were increased.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1432-1041
    Keywords: Bunitrolol ; β-blockade ; partial agonist ; haemodynamic response ; exercise
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary The effect of chronic beta blockade on the haemodynamic response to graded exercise was studied in 18 hypertensive patients treated with bunitrolol, which has partial agonist activity. The patients first received a placebo for 5 to 12 days, then bunitrolol 30 mg daily for one week and subsequently the dose was doubled weekly as necessary upto 240 mg daily. At rest haemodynamic changes after beta blockade were only minor; heart rate decreased by 8% and no significant change was observed in stroke index, cardiac index, (a-v)O2 difference and VO2. The hypotensive effect was not significant and no significant change in mean pulmonary arterial and wedge pressure was observed. Maximal exercise capacity remained unchanged, because of haemodynamic responses. The maximal exercise heart rate was reduced by 25% during beta blockade, which was compensated by a 34% elevation in stroke index, whereas maximal cardiac index and (a-v)O2 difference remained unchanged. There was no consistent change in mean pulmonary artery pressure during maximal exercise, but the mean brachial artery pressure fell by 12%.
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1432-1041
    Keywords: Key words: Calcium ; Mibefradil ; Mononuclear cells
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Abstract Objective: A double-blind, placebo-controlled parallel study was conducted on the effect of mibefradil, both an L- and T-type Ca2+-channel blocker with a more selective blockade of T-type channels, administered once daily for 1 week to normal male subjects, on blood pressure, intracellular cationic concentrations, sodium-proton exchange rate and 3 H-thymidine incorporation in peripheral blood mononuclear cells (PBMC). Methods: After a 1-week run-in period on placebo, the subjects (n = 40) were allocated to a placebo or a mibefradil group. Placebo or 50 mg mibefradil was administered once daily in the morning for 1 week. All subjects were investigated at baseline and after 1 week of placebo or mibefradil administration. Standing or recumbent blood pressure and heart rate of subjects in the mibefradil group was decreased (P 〈 0.05 or less) compared with that of subjects in the placebo group. Results: Decreased (P 〈 0.001) intracellular free Ca2+ concentration and reduced (P 〈 0.001) 3 H-thymidine incorporation in the PBMC were observed in the mibefradil-treated subjects. The intracellular sodium, potassium or magnesium concentration as well as the sodium-proton exchange rate were not changed during mibefradil administration. Conclusion: The blood pressure lowering action of mibefradil in men is accompanied by a decrease in intracellular free Ca2+ concentration. Mibefradil also reduced the 3 H-thymidine incorporation or de novo DNA synthesis in PBMC by modulating the calcium homeostasis.
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 1432-1041
    Keywords: Hypertension ; low sodium diet ; angiotensin antagonist ; plasma renin ; chlorthalidone ; hypotensive effect ; sodium depletion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary The hypotensive effect of acute sodium volume depletion, produced by chlorthalidone and a low sodium diet, was inversely related to the plasma renin concentration (PRC) in 13 hypertensive patients of varying aetiology (r=0.61; p〈0.05); weight reduction induced by this therapy was not related to PRC (r=0.12; p〉0.1). The angiotensin II antagonist 1-sar-8-ala-angiotensin II failed to reduce arterial pressure when the patients ingested 130 mEq sodium per day, but pressure fell when it was infused during sodium volume depletion, except when PRC remained low; the changes in pressure were related to the plasma renin level (r=0.78; p〈0.005). The combined hypotensive response to acute sodium volume depletion and to angiotensin II blockade during sodium volume depletion was not related to PRC (r=0.15; p〉0.1). The results demonstrate that acute sodium volume depletion caused similar weight loss in patients with high and low PRC values, and it would have had similar hypotensive effects but for angiotensin-induced vasoconstriction in the high renin patients. Since 1-sar-8-ala-angiotensin II also reduced arterial pressure in 6 patients during chronic diuretic therapy, angiotensin II must still induce vasoconstriction in these circumstances.
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  • 10
    ISSN: 1432-1041
    Keywords: hypertension ; captopril ; angiotensin ; renin ; aldosterone ; catecholamines ; prostaglandins ; kininase II ; hypotensive action
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary The acute hypotensive effect of captopril 25 mg was investigated in 26 hypertensive patients (11 with essential and 15 with renal arterial disease). Intra-arterial blood pressure was recorded continuously and arterial blood was sampled for renin, angiotensin I and II, aldosterone, kininase II, catecholamines and prostaglandins. Captopril led to an increase in plasma renin activity, active and total plasma renin concentration and angiotensin I, a decrease in plasma kininase II activity, angiotensin II, aldosterone, prostaglandins E2 and F2* and no change in plasma (nor)adrenaline, dopamine and inactive renin concentration. The hypotensive effect of captopril was related to the changes in plasma angiotensin II level and inversely to the change in prostaglandin E2; the correlation coefficients were low, respectively 0.61 and −0.44. It is likely that the acute hypotensive effect of captopril to some extent is related to changes in plasma angiotensin II and in prostaglandins E2 and F2*. There is no evidence for a role of the adrenergic systems in the hypotensive response.
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