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[Lethal aqueous pericardium-tamponade after overtreatment by forced diuresis (author's transl)].

A case of lethal pericardium-tamponade is reported as a consequence of excessive hydration in a 19-year-old woman. According to her own report, she took 8-10 tablets of Adumbran and Persumbran in drug form in an attempt to commit suicide. Neither clinical observation, the obduction, histological findings nor chemotoxicological analysis are capable of explaining a deadly poisoning by these tablets. This paper points to the necessity of most careful controls that are required even for adults in regard to the electrolytic and hydrological balances.

Adult↗

Constant K+/Na+ excretion ratio during peak diuresis after piretanide but insignificant K+ loss during 24 hours.

The effect of piretanide on Na+ and K+ excretion and on renal haemodynamics has been studied in 14 subjects with a GFR (Inulin clearance) ranging from 140 to 2 ml.min-1. After a two day fluid and salt balance control period, oral piretanide 6 mg induced a natriuresis and kaliuresis, which was proportional to the GFR of the patients. The ratio of drug-induced K+ to Na+ excretion was always 0.13, independent of individual GFR. This was only true for the duration of the action of piretanide, tau, which was 6 h in subjects with normal GFR and 5 h in patients with impaired kidney function. Surprisingly, after tau, i.e. for 24 h after drug administration, less potassium was lost than in the pretreatment period. Neither the GFR nor the renal blood flow (PAH clearance) of the patients were affected by piretanide. In conclusion, piretanide given once a day was an effective natriuretic agent, even in end-stage renal disease, and it produced relatively little K(+)-loss when given once daily.

Adult↗

Imaging of uretero-pelvic junction obstruction with stimulated diuresis. With consideration of the reliability of ultrasonography.

Eighty-nine kidneys of 81 infants and children with uretero-pelvic junction obstruction were investigated using ultrasonography (US), diuretic urography (DUR) and diuretic renography (DREN). Results of the US were false-negative in 14%. This can be avoided by ensuring that the patients get an amount of fluid appropriate to their age before the examination or by performing diuretic ultrasonography with frusemide. False-positive results were found with US in 15%, but obstruction was excluded by using the DUR and/or the DREN. During post-operative follow up the DUS is useful and after 6 months the clearance with 123-iodine hippurate combined with the DREN should be performed. The performance of the Whitaker-test is unnecessary.

Child↗

Rhodnius prolixus: effects of the neolignan burchellin on in vivo and in vitro diuresis.

Supplementation of blood with the neolignan burchellin (100 microg/ml), a compound from the arboreous Lauraceae Aniba burchelli, affected the course of excretion of fourth-instar larvae of Rhodnius prolixus, especially directly after feeding, and reduced the volume of feces/urine excreted within 6 h of feeding to about 18% and, on the simultaneous addition of the diuretic hormone analogue 5-hydroxytryptamine (5-HT), about 71% of that observed in untreated bugs. In the latter, 5-HT induced a significant 60% increase in excretion. Regardless of whether Malpighian tubules originating from unfed, untreated or fed, burchellin-treated bugs were incubated in vitro in the hemolymph of these bugs or in physiological saline supplemented with 5-HT with or without burchellin or in homogenates of thoracic ganglionic masses of untreated and treated bugs, burchellin was consistently found to affect the secretion rates. Therefore, burchellin not only depresses the release of the diuretic hormone or induces the release of antidiuretic factors but also directly affects the Malpighian tubules.

Animals↗

Modulatory effects of dopamine D3/2 agonists on kappa opioid-induced antinociception and diuresis in the rat.

RATIONALE: The dopamine (DA) D3/2 agonist 7-OH-DPAT has been shown to attenuate the behavioral effects of the mu agonist morphine as well as the development of morphine tolerance. OBJECTIVES: To evaluate the effects of DA D3/2 agonists [7-OH-DPAT, (+)-PD128,907, quinelorane, (-)-quinpirole], a D1 agonist (SKF38393), a D1 antagonist [(+)-SCH23390], a DA antagonist (spiperone), and an indirect DA agonist (cocaine) on the antinociceptive effects of kappa agonists (spiradoline, U69,593, bremazocine) as well as the effects of D3/2 agonists on the diuretic effects of spiradoline. METHODS: Antinociception was determined using a warm water (50-55 degrees C) tail-withdrawal procedure and urine output was collected over a 2-h interval. RESULTS: The antinociceptive effects produced by the kappa agonists varied with the intensity of the nociceptive stimulus (water), as maximal or near maximal effects were obtained with spiradoline at 55 degrees C, U69,593 at 52 degrees C, and bremazocine at 50 degrees C water. 7-OH-DPAT produced a dose-dependent attenuation of the antinociceptive effects of spiradoline, U69,593, and bremazocine. Spiperone completely reversed the effects of 7-OH-DPAT on spiradoline antinociception. (+)-PD128,907 and quinelorane, but not (-)-quinpirole or the other DAergic agents examined, attenuated the antinociceptive effects of spiradoline in a dose- and time-dependent manner. The diuretic effects of spiradoline were attenuated by 7-OH-DPAT, (+)-PD128,907, quinelorane, and (-)-quinpirole, and this attenuation was reversed by spiperone. CONCLUSIONS: The present study demonstrated that some D3/2 agonists can modulate both the antinociceptive and diuretic effects of kappa agonists. These modulatory actions are similar to those obtained against the effects of mu agonists.

Analgesics, Opioid↗

A randomized controlled trial comparing hydration therapy to additional hemodialysis or N-acetylcysteine for the prevention of contrast medium-induced nephropathy: the Dialysis-versus-Diuresis (DVD) Trial.

Contrast medium-induced nephropathy (CIN) is a serious complication with increasing frequency and an unfavorable prognosis. Previous analyses of surrogate parameters have suggested beneficial effects of hemodialysis that are assessed in this randomized clinical trial. We performed a prospective single-center trial in 424 consecutive patients with serum creatinine concentrations between 1.3- 3.5 mg/dl who underwent elective coronary angiography. Patients were randomized to one of three treatment strategies with all patients receiving pre- and postprocedural hydration: One group received no additional therapy, patients in the second group were hemodialyzed once, and the third group received oral N-acetylcysteine. The frequency of CIN (defined as an increase in serum creatinine>or=0.5 mg/dl) from 48 to 72 h after catheterization was 6.1% in the hydration-only group, 15.9% with hemodialysis treatment, and 5.3% in the N-ACC group (intention-to-treat analysis; P=0.008). There were no differences between the treatment groups with regard to increased (>or=0.5 mg/dl) serum creatinine concentrations after 30-60 days (4.8%, 5.1%, and 3.1%, respectively; P=0.700). Analyses of long-term follow-up (range 63 to 1316 days) by Cox regressions models of the study groups found quite similar survival rates (P=0.500). In contrast to other (retrospective) studies, long-term survival of patients with vs those without CIN within 72 h was not different, but patients who still had elevated creatinine concentrations at 30-60 days suffered from a markedly higher 2-year mortality (46% vs 17%, P=0.002). In conclusion, hemodialysis in addition to hydration therapy for the prevention of CIN provided no evidence for any outcome benefit but evidence for probable harm. Increased creatinine concentrations at 30-60 days, but not within 72 h, were associated with markedly reduced long-term survival.

Acetylcysteine↗

Indomethacin decreases furosemide-induced natriuresis and diuresis on the neonatal kidney.

Indomethacin is used to pharmacologically occlude patent ductus arteriosus in preterm infants. It induces renal untoward effects and furosemide is administered simultaneously to counteract them. The effect of furosemide is blunted by indomethacin. We analyzed comparatively the interactions of furosemide and indomethacin at the organic anion transport system in adult and newborn individuals. Adult and 5-day-old Wistar rats were allocated into three groups: (1) indomethacin (10 mg/kg, ip); (2) furosemide (2 mg/kg, ip); and (3) indomethacin/furosemide, at the same doses. Urinary flow, glomerular filtration rate (GFR), sodium and potassium fractional excretions, and free-water and osmolal clearances were estimated. Para-aminohippuric acid (PAH) uptake was measured in renal cortical slices to study the organic anion's secretory pathway. In adult and newborn rats, furosemide-induced increments in urinary fluxes and excretions of sodium and potassium were blunted by indomethacin administered simultaneously. PAH uptake was decreased to a further extent by indomethacin than by furosemide, suggesting that inhibition of the diuretic effect might be related to competition in the secretion of furosemide. Inhibitory interaction between indomethacin and furosemide was achieved at approximately 10-fold lower concentrations in the newborn than in the adult rats, suggesting that tubular secretion in the neonate is more sensitive to the action of these drugs than in the adult individual.

Animals↗