Related Experiment Videos
Effects of diuretics on urate and calcium excretion
Insights
This study compared diuretics for gout patients. Ticrynafen showed promise for lowering uric acid but had significant toxicity, limiting its use.
Area of Science:
- Nephrology
- Pharmacology
Background:
- Gout patients often have comorbidities like hypertension and renal calculi.
- Diuretic use can impact electrolyte and urate balance.
Purpose of the Study:
- To evaluate the effects of hydrochlorothiazide, furosemide, and ticrynafen on electrolyte and urate excretion in gout patients.
- To assess the short-term and long-term impacts of these diuretics.
Main Methods:
- Forty-nine gout patients were administered hydrochlorothiazide, furosemide, or ticrynafen.
- Measurements included diuresis, electrolyte clearances (Na, K, Cl, Ca), and urate/phosphorus clearances.
- Effects were observed after single doses and during prolonged use.
Main Results:
- Single doses of hydrochlorothiazide and furosemide increased diuresis and electrolyte clearances, with minimal effect on urate.
- Prolonged use of hydrochlorothiazide and furosemide led to diminished diuresis and altered electrolyte/urate excretion.
- Ticrynafen demonstrated significant uricosuria, natriuresis, and antihypertensive effects but exhibited hepatotoxicity and nephrotoxicity.
Conclusions:
- Hydrochlorothiazide and furosemide have transient effects on electrolytes and urate, with long-term use altering excretion patterns.
- Ticrynafen is a potent uricosuric and natriuretic agent but is clinically limited by severe toxicity.
- The findings highlight the complex interactions between diuretics, electrolytes, and urate metabolism in gout patients.
Abstract:
Forty-nine patients with gout, many with hypertension and/or renal calculi, were given hydrochlorothiazide, furosemide, or ticrynafen. Diuresis and increased clearances of sodium (Na), potassium (K), chloride (Cl), and calcium (Ca) occurred after a single dose of hydrochlorothiazide, 100 mg, or furosemide, 40 mg, orally. There was very slight change in urate and phosphorus clearances. With prolonged use of hydrochloride or furosemide, diuresis and increased electrolyte excretion disappeared. Urate and Ca excretion fell with hydrochlorothiazide. With long-term use of furosemide, urate excretion was suppressed, but Ca excretion was sustained. Ticrynafen produced diuresis and increased clearances of Na, K, and Cl. Calcium excretion was increased after a single dose and minimally decreased after long-term use. Most striking was the severe and rather sustained uricosuria. Though ticrynafen is an effective uricosuric, natriuretic, and antihypertensive agent, its hepatotoxicity and nephrotoxicity mitigate against its clinical use.