Hypertension of unknown cause is generally termed "essential." Because hypertension has long been considered a possible complication of lead poisoning and the EDTA lead-mobilization test has proved to be a sensitive indicator of excessive body stores of lead, we used this test to evaluate cumulative past lead absorption in 48 men diagnosed as having essential hypertension. Patients who had hypertension with reduced renal function (i.e., serum creatinine level greater than 1.5 mg per deciliter [133 mumols per liter]) had significantly larger amounts of mobilizable lead than did patients who had hypertension without renal impairment. The increase in mobilizable lead was not due to the renal disease itself, since 22 control patients without a history of essential hypertension but with comparable renal impairment from known causes excreted significantly less lead chelate during the three-day test. These data suggest that lead may have an etiologic role in the renal disease of some patients usually designated as having "essential" hypertension.
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