Phase II Study of the Pathophysiology and Treatment With Enalapril and Polystyrene Sulfonate for Pseudohypoaldosteronism, Type I

National Center for Research Resources (NCRR)

Status and phase: Completed; Phase 2

Conditions: Pseudohypoaldosteronism

Treatments: Drug: enalapril; Drug: polystyrene sulfonate

Study type: Interventional

Funder types: Other; NIH

Identifiers

NCT00004328

199/11883

UTMB-403

Details and patient eligibility

About

OBJECTIVES: I. Establish the sodium and potassium intake that will maintain a normovolemic state in a patient with pseudohypoaldosteronism.

II. Determine the effect of extracellular fluid volume and serum potassium manipulations on exercise tolerance, cardiac function, and endurance.

III. Investigate pharmacologic methods of limiting excretion of sodium in urine and sweat.

Full description

PROTOCOL OUTLINE: Sodium and potassium intake resulting in normalization of serum electrolytes and markers of extracellular volume are determined at baseline. A trial diet is then prescribed, with adjustments made to achieve a steady state with normal serum electrolytes. Exercise tolerance and muscle function are evaluated at steady state.

Sodium and potassium are sequentially manipulated with diet, enalapril, and polystyrene sulfonate. Exercise tolerance is evaluated during each diet period.

A treatment plan to maintain electrolyte balance is developed. The patient is followed monthly for 3 to 6 months, then every 3 months for up to 3 years.

Sex: All

Volunteers: No Healthy Volunteers

Inclusion and exclusion criteria

PROTOCOL ENTRY CRITERIA:

Pseudohypoaldosteronism