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上消化道出血表现为呕血或黑便,主要取决于()。

单选题
2022-07-11 16:35
A、出血的速度和量
B、出血部位的高低
C、病变的性质
D、凝血机制
E、胃肠蠕动情况
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正确答案
A

试题解析
胃十二指肠溃疡出血的临床表现与出血量及速度相关。出血量少者可仅有黑便。出血量大且速度快者可伴呕血,且色泽红。便血色泽可由黑色转呈紫色,便血前有头晕,眼前发黑,心慌、乏力。如出血更甚者可出现晕厥和休克症状。

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