An effect of 20 ultrafiltrates from patients with chronic renal failure on ADP-, epinephrine-, and arachidonic acid-induced platelet aggregation. Ultrafiltrates were collected at the beginning and the end of dialysis. It was found that ultrafiltrates collected at the beginning of dialysis decrease ADP-induced platelet aggregation whereas ultrafiltrates collected at the and of dialysis exert reverse effect. No effect on epinephrine- and arachidonic acid-induced platelet aggregation was seen. Removal of substances inhibiting platelet aggregation produced by ADP hemodialysis may reveal increased platelet aggregation in patients with uremia.
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