[Effect of hydrochlorothiazide on renal calcium and sodium excretion of different ages (III)]

Thirty normal students, including students in senior high, junior high and elementary schools were the subjects for hydrochlorothiazide test. Ten cases, in each age group, were given oral hydrochlorothiazide 2 mg/kg for three consecutive days. The significant natriuretic action was only observed on the first day during the period of oral hydrochlorothiazide, there was no obvious difference among the three age groups. The urinary calcium excretion of elementary and junior high school students is less than that of senior high school students. It is suggested that there is more effective hypocalciuric action for elementary and junior high school students than for senior high school students during the period of oral hydrochlorothiazide.