Abstract
Correlations of blood polychlorinated biphenyl (PCB) levels or PCB patterns and blood pressures were studied in 59 patients with yusho (PCB poisoning) above 40 years old. In spite of the passage of 13 years from the onset, 52.5% of these patients still have PCB levels higher than the range found in the general population. The frequency of hypertension in the patients was 16.9%, a value similar to that expected on the basis of the rate for a population of the same age and sex compositions. As an independent variable, the blood pressure of patients was not associated with blood PCB levels and PCB patterns. No PCB blood pressure association was confirmed in 20 patients with PCB levels persistently higher than 5 ppb for 9 years. On the other hand, age, obesity and habitual alcohol intake, known influencing factors for hypertension, tended to be positively associated with elevated blood pressure in these yusho patients.
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