Hydrochlorothiazide-amiloride causes excessive urinary zinc excretion

Area of Science:

• Nephrology
• Endocrinology
• Cardiovascular Medicine

Background:

• Essential hypertension is a common condition often managed with diuretics.
• Diuretics like hydrochlorothiazide and amiloride can affect electrolyte and mineral balance.
• Zinc plays a crucial role in various physiological processes, including blood pressure regulation.

Purpose of the Study:

• To investigate the impact of hydrochlorothiazide and amiloride on serum zinc levels and urinary zinc excretion in patients with essential hypertension.
• To determine if amiloride possesses a zinc-sparing effect when used in combination therapy or alone.

Main Methods:

• Comparative study involving three groups: essential hypertension patients on hydrochlorothiazide/amiloride, patients on hydrochlorothiazide monotherapy, and healthy control subjects.
• Measurement of serum zinc levels and 24-hour urinary zinc excretion in all participants.
• Statistical analysis to compare zinc parameters between the groups.

Main Results:

• Serum zinc concentrations were comparable across all three groups (hypertension with combination therapy, hypertension with monotherapy, and controls).
• Urinary zinc excretion was significantly elevated in both groups of hypertensive patients compared to controls.
• The results indicate that amiloride, at the dosage used, did not prevent the increased urinary zinc loss.

Conclusions:

• Chronic use of hydrochlorothiazide, with or without amiloride, leads to increased urinary zinc excretion in essential hypertension.
• Amiloride does not exhibit a zinc-sparing effect in hypertensive patients under these therapeutic conditions.
• Further research is warranted to explore the clinical implications of zinc depletion in hypertensive patients treated with these diuretics.