The levels of plasma endothelin - 1 (PET- 1) in 24 cases of patients with uremia before and after hemodialysis. and in 20 cases of healthy adulta were measured by radioimmuoassay. The results showed that the level of PET -1 was 26.73 ±7.73 pmol/L in the healthy adults; and 98.46 ±11.85pmol/L and 84.10±14.56 pmol/L before and after hemodialysis correspondently in patients with uremia
both significantly higher than the healthy control(P<0.01). The level of PET - 1 after hamodialysis was obviously lower than before hemodialysis
but no significant correlation with Bun . Scr. MAP and quantity of ultrafiltration liquid was found.