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The syndrome of inappropriate ADH secretion secondary to vinblastine-bleomycin therapy.

A clinical picture compatible with the syndrome of inappropriate ADH (antidiuretic hormone) secretion was observed in two patients receiving vinblastine-bleomycin chemotherapy. The mechanism by which this response is brought about is unclear. Penetration of Vinka alkaloids into CSF of humans is poor in the absence of extensive meningeal involvement, and hence an indirect method of action by a reduction in the osmotic threshold for vasopressin release has been suggested. By administering vinblastine on days 1 and 4 (instead of days 1 and 2, as suggested in the high-response regimen consisting of vinblastine, bleomycin, and cis-platinum) we have found better bone marrow tolerance and have not noticed the inappropriate ADH syndrome.

Adult↗

[Probable ADH inappropriate secretion syndrome in varicella].

Varicella (chickenpox) is sometimes associated with serious complications characterized bp changeable frequency in different ages. We describe a case of varicella with contemporary presence of several complications: serious impetigo , conjunctivitis, pneumonia, hepato-encephalic disease (probable Reye syndrome). This case is interesting because after adequate rehydration and normalization of electrolytes we registered a remarkable fall of plasmatic sodium and chloride as a result of hemodilution probably due to a syndrome of inappropriate secretion of antidiuretic hormone, confirmed by values of plasmatic and urinary osmolarity and of urinary electrolytes.

Chickenpox↗

[Pancreatitis and inappropriate ADH secretion syndrome associated with amiodarone].

We describe a case of hepatotoxicity, pancreatitis and inappropriate ADH secretion syndrome developed in a patient receiving chronic amiodarone treatment, not related to other causes. Hepatic toxicity is a well known condition. Inappropriate ADH secretion syndrome has not been described yet and there has been a single case-report of pancreatitis in the literature reviewed.

Aged↗

[Inappropriate ADH secretion syndrome].

Six patients are with inappropriate secretion of antidiuretic hormone syndrome are reported (two with bacterial acute meningitis, two with bacterial pneumonia, one with oat cell lung carcinoma, other with mediterranean fever boutonneuse) and the clinical manifestations were: mind changes (four cases) nausea-vomiting (two cases) and inappetence (six cases). All patients presented hyponatremia criteria, serum decreased osmolarity, urinary sodium and osmolarity increased, without edemas, renal disease endocrine (hypophysis, thyroids, adrenal) without diuretic treatment. Treatment was, effective water restriction in three patients and hydrochloride of demeclocycline in other three patients.

Adolescent↗

Treating the syndrome of inappropriate ADH secretion with isotonic saline.

It has been widely accepted that there is little use for saline treatment in the syndrome of inappropriate secretion of ADH (SIADH). However, having observed that most SIADH patients increased their plasma sodium (PNa) after 2 l isotonic saline over 24 h, we investigated whether urine osmolality or the sum of urinary sodium and potassium (UNa + K) predicted this response, in 17 consecutive patients with chronic SIADH. The initial measure of urinary sodium plus potassium (UNa + K t0) was weakly correlated to the change in PNa (DPNa) after infusion (r = -0.51; p < 0.05), while initial urine osmolality (UOSM t0) was a much better predictor (y = -0.024x + 12.90; r = -0.81; p < 0.001). The lack of predictive value for UNa + K t0 was probably because urine electrolyte concentrations were not maximal for the corresponding initial UOSM. This reflects differences in salt intake between the patients. The theoretical maximal value for UNa + K t0 (th max UNa + K t0) for a given USOM t0, was as good a predictor as UOSM t0 (th max UNa + K vs. DPNa: r = -0.81; p < 0.001). A theoretical model describing the effect of 2 l isotonic saline infusion on DPNa as a function of UNa + K, produced values comparable to those observed in our patients. Only 6/17 patients, those with UOSM > 530 mOsm/kg, had their hyponatraemia aggravated by 2 l isotonic saline. Many SIADH patients have lower UOSM; in most such patients, 2 l of isotonic saline will improve PNa.

Electrolytes↗