Abstract
The purpose of the present investigation was to determine the effect of chronic aspirin administration on the serum concentration and renal clearance of inorganic sulfate in healthy volunteers. In a randomized crossover study, eight male subjects received either no treatment or 975 mg of enteric-coated aspirin three times daily for 8 days. Blood and urine samples were collected on the eighth day over a 7-hr period. Midpoint salicylic acid concentrations in serum varied between 55 and 182 micrograms/ml (mean concentration of 109 micrograms/ml). Serum inorganic sulfate concentrations demonstrated a small but significant decrease on the eighth day of aspirin administration but there was no apparent change in the renal clearance of sulfate. There were significant correlations between the renal clearances, urinary excretion rates, and serum concentrations of creatinine and sulfate, reflecting the dependence of sulfate homeostasis on renal function. The serum concentration and renal clearance of creatinine, sodium, potassium, calcium, magnesium, and phosphorus were unaffected by aspirin treatment.
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