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Pharmacokinetics of hydrochlorothiazide in patients with congestive heart failure
Insights
Hydrochlorothiazide (HCT) shows reduced gastrointestinal uptake and altered pharmacokinetics in patients with cardiac failure. Its plasma half-life correlates with creatinine clearance, indicating significant changes in drug handling during heart failure.
Area of Science:
- Pharmacology
- Cardiology
- Nephrology
Background:
- Cardiac failure significantly impacts drug pharmacokinetics.
- Understanding drug behavior in heart failure is crucial for effective treatment.
Purpose of the Study:
- To investigate the pharmacokinetics of hydrochlorothiazide (HCT) in patients with cardiac failure.
- To assess the impact of cardiac failure on HCT absorption, distribution, and elimination.
Main Methods:
- Oral administration of hydrochlorothiazide (50-75 mg) to seven cardiac failure patients.
- Quantification of plasma and urinary HCT levels using gas-liquid chromatography (GLC).
- Correlation analysis between HCT plasma half-life and endogenous creatinine clearance.
Main Results:
- Reduced gastrointestinal uptake of HCT, approximately halved compared to healthy controls.
- Plasma half-life of HCT demonstrated a correlation with endogenous creatinine clearance.
- Significant alterations in HCT pharmacokinetics were observed in patients with cardiac failure.
Conclusions:
- Cardiac failure markedly alters the pharmacokinetic profile of hydrochlorothiazide.
- Reduced absorption and changes in elimination necessitate careful consideration of HCT dosing in heart failure patients.
- Creatinine clearance is a relevant factor influencing HCT disposition in this population.
Abstract:
1. Hydrochlorothiazide (HCT, 50-75 mg) was administered orally to seven patients with cardiac failure. 2. Plasma levels and urinary concentration of HCT were determined by GLC. 3. The gastrointestinal uptake of the diuretic in three patients was reduced to approximately half that seen in healthy controls. 4. Plasma halflife of HCT was correlated with endogenous creatinine clearance. 5. Pharmacokinetics of HCT are considerably changed in cardiac failure.