摘要
目的分析机械通气条件下,呼气末二氧化碳分压(PETCO2)与动脉血二氧化碳分压(PaCO_2)之间的相关性。方法选择2016年6月至2017年3月在重症医学科行有创机械通气的成年患者,每例患者需要评估动脉血气时,同一时间检测PETCO2,待数值稳定后,记录PETCO_2数据。动脉血气分析采集桡动脉或股动脉血标本,床旁完成检测。PETCO_2数据和动脉血气分析在5 min内完成。比较不同呼吸机治疗模式、不同疾病类型和不同氧合指数下二者之间相关性。结果共有104例患者225组PETCO_2-PaCO_2成对数据纳入分析。在未区分呼吸机模式下,PETCO_2和PaCO_2之间具有明显正相关,相关系数为0.70,直线回归方程Y=11.08+0.77X(Y:PaCO_2;X:PETCO_2)。不同呼吸机模式情况下,仅辅助/控制通气(A/C)模式下二者不具相关性(r=0.31,P=0.10);而同步间歇指令通气(SIMV)和自主通气(SPONT)模式下,二者具有明显相关性,但SPONT模式下相关性相对较弱(r=0.60,P<0.001)。在慢性阻塞性肺疾病、多发伤、严重脑血管疾病以及重症肺炎患者,PETCO2和PaCO_2均呈正相关,相关系数分别为0.76、0.64、0.53和0.56。氧合指数<200 mmHg或≥200 mmHg时,二者之间均明显正相关,相关系数分别为0.69和0.71。结论接受有创机械通气的病情稳定患者,不同呼吸机模式下、不同疾病类型、不同氧合指数时,PETCO_2与PaCO_2均具有明显正相关。
Objective To analyze the relationship between end-tidal carbon dioxide partial pressure （PETCO2） and arterial CO2 pressure （PaCO2） in invasive ventilated patients. Methods An observational study was conducted in adult patients admitted to Intensive Care Unit （ICU） between June 2016 and March 2017. Samples were immediately analyzed for PaCO2 using a blood gas analyzer. At the same time the arterial to end-tidal CO2 gradient was determined. Relationship in different mechanical ventilation modes, disease categories and PaO2/FiO2 were analyzed in this study. Results A total of 225 arterial blood gases were obtained from the 104 patients. In each of these modes the PETCO2 was generally lower than the PaCO2. There was a positive correlation between PaCO2 and PETCO2 regardless of different mode （r=0.70, Y=11.08＋0.77X）. A positive correlation was found in SIMV and SPONT modes, but not in A/C mode. The relationship between PaCO2 and PETCO2 in COPD, trauma, cerebrovascular disease and severe pneumonia patients shown a positive correlation （r value was 0.76, 0.64, 0.53, and 0.56, respectively）. There was a significant correlation whether PaCO2/FiO2〈200 mm Hg （r=0.69, P〈0.001） or ≥200 mm Hg （r=0.71, P〈0.001）. Conclusions The results of this study show that PETCO2 monitoring accurately reflects PaCO2 during mechanical ventilation. A positive correlation is found in different ventilation modes, regardless of disease categories or PaCO2/FiO2.
出处
《中国呼吸与危重监护杂志》
CAS
CSCD
北大核心
2018年第1期71-75,共5页
Chinese Journal of Respiratory and Critical Care Medicine
关键词
呼气末二氧化碳分压
动脉血二氧化碳分压
机械通气
相关性分析
End-tidal carbon dioxide partial pressure gradients
Arterial carbon dioxide pressure
Mechanicalventilation
Correlation analysis
