患者,男,60岁。反复上腹痛3年,疼痛节律不明显,食欲缺乏。突然呕血3次,每次300ml,经积极治疗24小时,出血仍不止。血压为90/50mmHg。最适宜的治疗措施是
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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