简述重型腹泻代谢性酸中毒发生的原因。
(1)因腹泻丢失大量碱性物质;(2)进食少,肠吸收不良,摄入热量不足使机体没有正常能量供应而导致脂肪分解增加,产生大量酮体;(3)因脱水血容量减少,血液浓缩使血流缓慢,使组织灌注不良、缺氧致无氧酵解增加而使乳酸堆积;(4)脱水使肾血流量不足,尿量减少,排酸保钠功能低下而使酸性代谢产物滞留。
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