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分期一、缺血期:在休克早期,由于休克的病因刺激与代偿机制的存在,交感—肾上腺髓质系统强烈活动,血中儿茶酚胺的浓度明显增高。除脑和心脏外,其它器官的小动脉、微动脉、后微动脉及前毛细血管均处于收缩状态,以维持动脉血压相对恒定,保证脑和心脏的血液供给。除脑和心脏外的其它器官,因毛细血管前阻力增大,血液灌入减少,组织缺血缺氧,物质不能充分交换,构成了休克时微循环的“缺血期”。病人出现烦躁,焦虑,心
Staging First, the ischemic period: early in the shock, due to the etiology of shock and compensatory mechanism of the existence of sympathetic - adrenal medulla system activity, the concentration of blood catecholamines was significantly higher. In addition to the brain and heart, other organs of the arterioles, arterioles, posterior arterioles and pre-capillaries are in a state of contraction in order to maintain a relatively constant arterial blood pressure to ensure that the brain and heart blood supply. In addition to the brain and other organs outside the heart, due to increased pre-capillary resistance, reduced blood flow, tissue ischemia and hypoxia, substances can not be fully exchanged, constitutes a microcirculation in the “ischemic period.” Patients appear irritability, anxiety, heart