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The objective of this trial was to provide 6 months of safety follow-up for children and adolescents with dilutional (euvolemic or hypervolemic) hyponatremia who had previously participated in a tolvaptan hyponatremia trial and to assess the efficacy of tolvaptan in increasing serum sodium for those participants who received optional continuing tolvaptan treatment of variable duration (up to 6 months).
Full description
Core Safety Follow-up Component
• For all participants: To evaluate the post-treatment safety follow-up of children and adolescent participants with dilutional (euvolemic or hypervolemic) hyponatremia who have previously participated in a tolvaptan hyponatremia trial.
Optional Tolvaptan Treatment Component
• For participants who receive optional tolvaptan treatment: To demonstrate that tolvaptan safely and effectively achieves and maintains increased serum sodium concentrations in children and adolescent participants with dilutional (euvolemic or hypervolemic) hyponatremia when used for both multiple short-term treatments, and/or longer chronic treatments.
Enrollment
Sex
Ages
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Inclusion and exclusion criteria
Core Safety Follow-up Component
Inclusion Criteria: Participation in a prior pediatric trial with tolvaptan for euvolemic or hypervolemic hyponatremia.
Exclusion Criteria: None
Optional Tolvaptan Treatment Component (per treatment cycle)
Eligibility Criteria:
Ineligibility Criteria:
Had evidence of hypovolemia or intravascular volume depletion (for example, hypotension, clinical evidence of volume depletion, response to saline challenge); if the participant had systolic blood pressure or heart rate outside of the normal range for that age, then volume status was to be specifically clinically assessed to rule out volume depletion.
Had serum sodium < 120 mEq/L (mmol/L), with or without associated neurologic impairment (that is, symptoms such as apathy, confusion, or seizures).
Use of potent CYP3A4 inhibitors in participants ≤ 50 kg or moderate CYP3A4 inhibitors in participants < 20 kg.
Lacked free access to water (inability to respond to thirst) or without ICU-level fluid monitoring and management.
Had a history or current diagnosis of nephrotic syndrome.
Had transient hyponatremia likely to resolve (for example, head trauma or post-operative state).
Had hyperkalemia defined as serum potassium above the upper limit of normal (ULN) for the appropriate pediatric age range.
Had estimated glomerular filtration rate (eGFR) < 30 milliliters (mL)/minute (min)/1.73 meters squared (m^2) calculated by the following equation: eGFR (mL/min/1.73 m^2) = 0.413 x height (centimeter [cm])/serum creatinine (mg/deciliter [dL]).
Had acute kidney injury defined as: Increase in serum creatinine by ≥ 0.3 mg/dL (≥ 26.5 micromoles [μmol]/L) within 48 hours; or increase in serum creatinine to ≥ 1.5 times baseline, which was known or presumed to have occurred within the prior 7 days; or urine volume < 0.5 mL/kg/hour for 6 hours.
Had severe or acute neurological symptoms requiring other intervention (for example, hyperemesis, obtundation, seizures).
Had had treatment for hyponatremia with:
Had anuria or urinary outflow obstruction, unless the participant was, or could be, catheterized during the trial.
Had a history of drug or medication abuse within 3 months prior to the pretreatment visit or current alcohol abuse.
Had a history of hypersensitivity and/or idiosyncratic reaction to benzazepine or benzazepine derivatives (such as benazepril).
Had psychogenic polydipsia (participants with other psychiatric illness may be included per medical monitor approval).
Had uncontrolled diabetes mellitus, defined as fasting glucose > 300 mg/dL (16.7 mEq/L [mmol/L]).
Had screening liver function values > 3 x ULN.
Had cirrhosis and met any of the following conditions: a major gastrointestinal bleed within the past 6 months, evidence of active bleeding (for example, epistaxis, petechiae/purpura, hematuria, or hematochezia), platelet count < 50,000/μL, or use of concomitant medications known to increase bleeding risk.
Had hyponatremia due to the result of any medication that can safely be withdrawn (for example, thiazide diuretics).
Had hyponatremia (for example, hyponatremia in the setting of adrenal insufficiency, untreated hypothyroidism, or hypotonic fluid administration) that is most appropriately corrected by alternative therapies.
Was currently pregnant or breastfeeding.
Had any medical condition that, in the opinion of the investigator, could interfere with evaluation of the trial objectives or safety of the participants.
Was deemed unsuitable for trial participation in the opinion of the investigator.
Participation in another investigational drug trial within the past 30 days, without prior approval from the sponsor medical monitor.
Participants < 4 years of age (or per local Health Authority age restrictions), weight < 10 kg, or who were unable to swallow tablets.
Primary purpose
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Interventional model
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3 participants in 1 patient group
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Data sourced from clinicaltrials.gov
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