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Journal Article
Multicenter Study
[Treatment of autosomal dominant polycystic kidney disease (ADPKD) - Tolvaptan].
Giornale Italiano di Nefrologia : Organo Ufficiale Della Società Italiana di Nefrologia 2016 September
The European Medicines Agency approved tolvaptan to slow cyst growth and renal failure progression in adults with ADPKD, glomerular filtration 60 mL/min x 1.73 m2 and rapidly progressive disease. In a multicenter 3-year study, conducted on 1,445 patients with non-genotyped ADPKD, ages 18-50 years, predicted creatinine clearance 60 mL/min and kidney total volume 750 mL, tolvaptan slowed kidney failure progression (-23%-46% for different objectives) and reduced kidney volume increase and pain without effects on hypertension and albuminuria.Tolvaptan induced reversible idiosyncratic hepatopathy in 4% of patients (1% in placebo). Tolvaptan antagonizes ADH effects, reduces cyclic-AMP generation in distal nephron, and induces water diuresis. It has high protein-binding and 8-hour half-life. Dosage is 60-120 mg/day in two different doses (for instance 45/15 or 60/30 mg). Treatment starts using lower dose and continues with cautious up-titolation. Data are insufficient for severe hepatopathy or nephropathy. There is no antidote against overdose. Dialysis should not remove tolvaptan. Aquaretic effects require high fluid intake to prevent dehydration. Treatment should be reduced or suspended in case of inadequate fluid intake or dehydration. Weight, natremia and plasma osmolality can inform on dehydration risks. Efficacy is not yet investigated on end-stage renal disease, non-renal ADPKD-related disorders, and mortality.
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