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近20年来,血气分析在临床的应用,已成为急诊抢救、呼吸与代谢疾病主要的监护指标。对观察病情的发展、指导治疗及预后的估计意义很大。血气分析不但可直接或间接反映呼吸的通气与换气功能,并可了解体内酸碱与电解质的平衡状态。一、血氧(O_2)分析的判断血O_2分析常用动脉血氧分压(PaO_2),氧饱和度(SaO_2)及氧含量(CaO_2)三个指标。氧离曲线是在一定的PaO_2下血红蛋白(Hb)与O_2结合的程度(即SaO_2)。此曲线呈S形,在SaO_2接近正常时,PaO_2的测定比SaO_2更为敏感。如SaO_2自97.6%降至96.5%,即仅降低1.1%
In the past 20 years, the clinical application of blood gas analysis has become the main monitoring index for emergency treatment, respiratory and metabolic diseases. The observation of the development of the disease, guiding the treatment and prognosis of great significance. Blood gas analysis can not only directly or indirectly reflect respiratory ventilation and ventilation function, and can understand the body acid-base and electrolyte balance. First, the determination of blood oxygen (O_2) analysis O_2 blood analysis commonly used arterial oxygen pressure (PaO_2), oxygen saturation (SaO_2) and oxygen content (CaO_2) three indicators. The oxygen dissociation curve is the degree of hemoglobin (Hb) binding to O 2 (ie, SaO 2) at a certain PaO 2 level. This curve is S-shaped, and when SaO 2 is near normal, PaO 2 is more sensitive than SaO 2. If SaO_2 is reduced from 97.6% to 96.5%, that is, only 1.1%