Phase II Study of Sodium Phenylbutyrate, Sodium Benzoate, Sodium Phenylacetate, and Dietary Intervention for Urea Cycle Disorders

Amino Acid Metabolism, Inborn Errors Clinical Trial

Clinical Trial Details — Status: Completed

Administrative data

• NCT number: NCT00004767
• Other study ID #: 199/11753
• Secondary ID: JHUSM-11753
• Status: Completed
• Phase: Phase 2
• First received: February 24, 2000
• Last updated: June 23, 2005
• Start date: January 1985

Study information

• Verified date: December 2001
• Source: Office of Rare Diseases (ORD)
• Contact: n/a
• Is FDA regulated: No
• Health authority: United States: Federal Government
• Study type: Interventional

Clinical Trial Summary

OBJECTIVES:

I. Assess the safety and efficacy of sodium phenylbutyrate, sodium benzoate, sodium phenylacetate, and dietary intervention in patients with urea cycle disorders.

Description:

PROTOCOL OUTLINE: This protocol describes several clinical studies of pharmacologic and dietary management in patients with urea cycle disorders.

Patients with carbamyl phosphate synthetase and ornithine transcarbamylase deficiency are treated with a low-protein diet, essential amino acids (for neonatal onset disease), caloric supplementation, oral sodium phenylbutyrate (now approved as a prescription drug 11/97), and citrulline or arginine free base.

Patients with argininosuccinic acid synthetase deficiency are treated with a low-protein diet, caloric supplementation, oral sodium phenylbutyrate (now approved as a prescription drug 11/97), and arginine free base.

Patients with argininosuccinic aciduria (AA) are treated with a low-protein diet, caloric supplementation, and arginine free base. (Discontinued 11/97) Any patient who develops hyperammonemia is treated with intravenous sodium benzoate, sodium phenylbutyrate, and arginine hydrochloride; benzoate and phenylbutyrate are not given to patients with AA.

If ammonium stabilizes at normal or near normal levels, intravenous medications are gradually replaced by oral medications. If there is no significant decrease in ammonium within 8 hours, patients begin hemodialysis.

Concurrent therapy with ondansetron, high caloric intake, and mannitol for elevated intracranial pressure is allowed. Dietary and intravenous nitrogen is prohibited. (Discontinued 11/97)

Recruitment information / eligibility

• Status: Completed
• Enrollment: 20
• Accepts healthy volunteers: No
• Gender: Both
• Age group: 18 Years to 65 Years

Eligibility

PROTOCOL ENTRY CRITERIA:

Urea cycle deficiency, i.e.: Carbamyl phosphate synthetase deficiency (CPSD) Ornithine transcarbamylase deficiency (OTCD) Argininosuccinic acid synthetase deficiency (ASD) Argininosuccinic aciduria (AA)

Study Design

Primary Purpose: Treatment

Related Conditions & MeSH terms

• Amino Acid Metabolism, Inborn Errors
• Metabolism, Inborn Errors
• Urea Cycle Disorders, Inborn

Intervention

Drug:
• Sodium Benzoate

• Sodium Phenylacetate

• Sodium Phenylbutyrate

Behavioral:
• Dietary Intervention

Locations

Country	Name	City	State
n/a

Sponsors (2)

Lead Sponsor	Collaborator
National Center for Research Resources (NCRR)	Johns Hopkins University