[Operative bleeding tendency in patients with polycythemia in plateau regions].
D000328:Adult; D000368:Aged; D000531:Altitude; D006470:Hemorrhage / Q000209:etiology*; D006801:Humans; D007431:Intraoperative Complications / Q000209:etiology*; D008297:Male; D008875:Middle Aged; D011086:Polycythemia / Q000601:surgery*; D011183:Postoperative Complications / Q000209:etiology*