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The efficacy and biochemical effects of two low-dose thiazide plus potassium-sparing diuretic preparations were compared in the treatment of elderly patients with stable, mild to moderate congestive heart failure. Sixty patients (mean age 80 years) were randomly allocated to treatment with 1 tablet daily of either 25 mg hydrochlorothiazide/2.5 mg amiloride or 25 mg hydrochlorothiazide/50 mg triamterene. The dose was increased to 2 tablets daily if necessary, after 2 weeks, for a further 6 weeks. Patients' response to treatment was assessed at 2, 4 and 8 weeks using a simple clinical scoring system for signs and symptoms of their condition, and routine biochemical analysis was carried out at baseline and the end of treatment. One patient was withdrawn from the study due to a rash which was probably related to hydrochlorothiazide/amiloride treatment. A further 11 patients were excluded from the analysis because of intercurrent illness or inadequate records. Analysis of the results from 48 patients showed that both treatments resulted in an improvement in clinical score and weight reduction, with more than three-quarters of the patients responding to treatment. No serious biochemical disturbances occurred; in particular, no new cases of hyponatraemia (serum sodium less than 130 mmol/l) developed. Both preparations, therefore, were effective and tolerated forms of treatment for mild to moderate congestive heart failure in the elderly and there were no significant differences between them.
A cross-over study comparing the effects of doxazosin, moduretic and amlodipine on fasting blood glucose and blood pressure levels in 9 adult hypertensive Nigerians is presented. The results showed that doxazosin, moduretic and amlodipine were effective in reducing diastolic blood pressure and thus confirmed our previous observation of blood pressure reduction during the monotherapies of these antihypertensive agents. The study further indicated the effectiveness of doxazosin in the management of severe essential hypertension in Nigerian patients. Fasting blood glucose level significantly decreased during doxazosin treatment phase and increased during moduretic phase, while amlodipine treatment did not have any effect on blood glucose level. In conclusion, the cross-over study seem to confirm the effectiveness of doxazosin therapy and its antidiabetic effect in hypertensive patients. The effectiveness of amlodipine therapy in controlling blood pressure was also observed, but no effect on blood glucose level, while moduretic therapy has hyperglycemic effect despite its effectiveness in blood pressure control in African patients.
A cross-sectional retrospective drug use review was conducted between June 1st and August 31st 2002 using randomly selected 200 case notes of patients attending the Hypertension Clinic at a 900-bed tertiary care facility in southwestern Nigeria. 11 case notes were not used due to incompleteness.
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Nephrogenic diabetes insipidus (NDI) is characterized by the kidney's inability to concentrate urine, which causes intense polyuria that may lead to urinary tract dilation. We report the morphological findings of the urinary tract in ten boys with NDI specifically addressing the presence and changes of urinary tract dilation during treatment.
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The purpose of this study was to identify the frequency of cardiac dysrhythmias in two similar groups of hypertensive middle-aged males (age 45-66). They had previously been randomized either to a diuretic treatment (n = 42), or a beta-blocking agent (n = 41). A 24-hour ambulatory Holter monitoring, and serum potassium, was obtained in all patients, serum magnesium was measured in 35 patients. The mean number of ventricular premature beats (VPBs) and the frequency of complex arrhythmias (19 vs. 5) was significantly higher in the diuretic group (p less than 0.01). The serum potassium was significantly lower (p less than 0.001) in the diuretic group, and there was a significant (p less than 0.005) inverse correlation between the number of VPBs and the serum potassium in all treated patients. The patients with complex arrhythmias were older (p less than 0.01) than the remainder of the patients. No correlation between serum magnesium and VPBs or complex arrhythmias was found. This study demonstrates increased frequency of VPBs in older hypertensive males, treated with diuretics, and that hypokalaemia predisposes to increased cardiac arrhythmias. We conclude that in older mildly hypertensive men hypokalaemia should be avoided.
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Acute effects of amiloride (5 mg) (A), hydrochlorthiazide (50 mg) (H) and the combination (50 + 5 mg) (HA) on urinary electrolyte excretion and pH of ten healthy volunteers--taking placebo five times and twice randomly A and HA and once H--were studied during one day. Amiloride showed a natriuretic effect, which in combination was additive to that of hydrochlorthiazide, but the excretion of water did not increase significantly after A. The urinary excretion of potassium decreased with amiloride below normal levels and was at the level of placebo after the combination (HA). There was a striking linear correlation between urinary sodium and potassium with all the drugs, although showing with A a higher potassium retention during high sodium excretion. Urinary pH rose after A and HA during the first 8 hours, but this effect was not seen, however, after H. No significant differences in the effect of the two brands of A (Medamor and Puritrid) on the urinary electrolyte excretion and pH, nor in those of the two brands of HA (Moduretic and Amitrid) were found. Similarly, the plasma concentrations of hydrochlorthiazide, determined gas chromatographically, were equal after Moduretic and Amitrid tablets. The systemic availability of H was faster in the combination of HA than alone. In the AUC value of H, however, there was no significant difference between HA and H tablets.
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An open parallel study was carried out in general practice on 70 patients with uncomplicated mild to moderate hypertension to compare the hypotensive efficacy of hydrochlorothiazide/amiloride with that of cyclopenthiazide/potassium. After a 2-week baseline period on placebo, patients were allocated at random to receive treatment with one or other of the diuretics starting with 1 tablet per day and increasing up to a maximum of 4 tablets per day or until their supine diastolic blood pressure was 90 mmHg or less. They were then continued at their optimum dose for a further 4 weeks. Analysis of the results from 62 patients showed that the hydrochlorothiazide/amiloride preparation produced both a greater decrease and better control of blood pressure in a greater percentage of patients that did the comparison diuretic. In addition, the beneficial effects were attained with fewer tablets, of importance for patient compliance.
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Patients were diagnosed at a median age of 1.6 years (range, 0.16-6.33 years) and treated with a low osmotic diet, hydrochlorothiazide-amiloride and indomethacin, which decreased the diuresis from a median of 10.5 ml/kg/h to 4.4 ml/kg/h (p < 0.001). Three patients showed normal renal ultrasound before treatment until last control, while the remaining seven showed urinary tract dilation. In this second group, dilation was reduced with treatment in four patients and disappeared in the remaining three. Children without dilation or in whom the dilation disappeared were diagnosed and treated earlier than those with persistent dilation (median 1.66 versus 4.45 years, respectively). After a median of 10.4 (range, 2.3-20.3) years of follow-up, no patients showed urological complications.
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A randomized double-blind, crossover trial was carried out in twenty hypertensive patients to evaluate the hypotensive efficacy and safety of indapamide. Indapamide in doses of 2.5 mg per day in combination with other antihypertensive agents was as effective in reducing the blood pressure in hypertensive patients as one tablet of Moduretic (50 mg hydrochlorothiazide and 5 mg amiloride). Indapamide induced no changes in serum potassium or uric acid levels and there were no major side effects.
Old people are commonly receiving diuretics on admission to hospital. Diuretics are recognized as a risk factor for electrolyte disturbances; controversy exists about the relative risks of different combinations (in particular, co-amilozide [Moduretic]). We recorded the drug history and serum electrolytes in 1000 consecutive admissions to a geriatric hospital, and examined the relative prescribing rates of various diuretics in the community. Full results were obtained in 929 patients. A history of diuretic prescription was present in 353 (38%) of the patients; the mean serum sodium in this group (95% CI 136.0-137.1 mmol/l) was lower than in the 586 not prescribed diuretics (137.1-137.9 mmol/l). The difference was small but statistically significant (95% CI difference = 0.3-1.6 mmol/l; P less than 0.01). Hyponatraemia (serum sodium less than 130 mmol/l) was not significantly commoner in the 41 patients prescribed co-amilozide than in patients prescribed other diuretics. In general patients prescribed potassium-retaining diuretics had a lower serum sodium than the others. There was a significant positive correlation between the serum potassium and the log [serum urea] (r = 0.26, P less than 0.001) and a weak negative correlation existed between sodium and potassium (r = -0.14; P less than 0.001). There was an association between the prescription of potassium-retaining diuretics and a higher serum potassium; also an association between the prescription of a loop or thiazide diuretic and a lower serum potassium. These interactions were shown by multiple regression analysis to be independent and additive.(ABSTRACT TRUNCATED AT 250 WORDS)
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To study the effect of a combination of amiloride, 5 mg, and hydrochlorothiazide, 50 mg (Moduretic), on plasma and skeletal muscle electrolytes in patients on long-term diuretic therapy (greater than 1 year) for arterial hypertension and/or congestive heart failure, 58 patients were recruited. Fifty-five patients completed the study, 27 controls and 28 in the treatment group. The Moduretic group demonstrated a significant increase in skeletal muscle potassium and magnesium values and a significant decrease in systolic blood pressure after 6 months on therapy. There was no significant change in these parameters in the control group. It is concluded that this combination of amiloride and hydrochlorothiazide is capable of preserving the internal and external balance of potassium and magnesium on a long-term basis in the patient categories studied.