简述上消化道出血患者继续出血或再出血的表现。
(1)呕血或黑粪次数增多,呕血由咖啡色转为鲜红色,黑粪变为暗红色稀便,伴肠鸣音亢进:(2)休克表现经输血输液未见好转:血红蛋白持续下降,或每小时尿量正常时,血尿素氮继续增高或再次增高
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