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789

卷起衣袖捐热血,回家后却发现手臂瘀血,是很多“热血”民众的经验,遇到皮下瘀血应该如何处理?建议捐完血后发现扎针手臂有瘀血,应于24小时内冰敷,48小时后才可热敷。大约2周左右瘀血才会逐渐消失,颜色由青紫色渐渐变淡,至淡黄色时就痊愈。
皮下瘀血是指抽血针穿过静脉,造成皮肤下血肿块或血液由血管渗出,皮肤呈现青紫色变化。
捐血后手臂扎针部位发生瘀血原因大概有4种,首先,可能是因为下针角度或深度有偏差,导致血管受伤。
其次,是捐血后扎针部位加压不够,止血不完全,血液流出血管外皮下组织。
另外,也可能是单纯因为捐血人血管壁太脆弱,或捐完血后2小时内手臂出力或提重物导致。
一开始发现瘀血,因为血管还在渗血,应该先冰敷使局部血管收缩,让伤口不再渗血,减少组织肿胀;发现瘀血两天后,伤处不再渗出液体,就必须热敷促进非伤口处的血液循环,促进代谢残余血块。
当血管壁因扎针或受伤时,血小板会马上到伤口,产生一些复杂的变化后塞住伤口,然后再慢慢修补受伤的血管壁,血管收缩使血流变慢减少出血,同时血小板动员至受伤部位。
当血小板附着于血管壁并凝集成块,以达初步止血作用。血液进行复杂的凝固作用,产生纤维素将血球包围起来,达到凝血的目的。
捐完血,当针头拔出后,直接加压针孔处是最有效的止血方法,可以避免瘀血发生,当天尽量让扎针手臂休息,不要提重物,不要出力太大。
另外,如果发生瘀血,应将抽血针头拔除,并在出血处以无菌纱布加压7至10分钟、再冰敷5分钟,即可减轻瘀血现象。
最让民众担心的是皮下瘀血范围越变越大,其实只是因为皮下组织稀松,血液从血管流出后会散开,故呈现瘀血扩散现象。当瘀血消失后,一切恢复正常,对健康绝对没有影响。
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