浅快呼吸指数在40例重症肺炎合并急性呼吸衰竭患者机械通气撤机中的应用

目的探讨浅快呼吸指数（f/VT）在重症肺炎合并急性呼吸衰竭机械通气患者撤机时的预测价值。方法 40例重症肺炎合并急性呼吸衰竭患者达到临床撤机标准后,监测其浅快呼吸指数（f/VT）。结果撤机成功组（31例）f/VT平均为（78±21）bpm/L,撤机失败组（9例）f/VT平均为（108±20）bpm/L,撤机成功组f/VT明显低于撤机失败组（P〈0.05）。撤机成功组中f/VT≤105bpm/L者29例,f/VT〉105bpm/L者2例;撤机失败组中f/VT≤105bpm/L者4例,f/VT〉105bpm/L者5例,以f/VT≤105bpm/L为标准,其预测撤机成功的灵敏度为93.54%,特异度为55.56%。结论 f/VT在重症肺炎合并急性呼吸衰竭呼吸机撤离时是一种简便、无创、预测准确性较高的临床撤机指标之一,适合基层医院操作。

Use of the rapid / shallow breathing index as an indicator to 40 patients with severe pneumonia combined with acute respiratory failure underwent withdraw from mechanical ventilation

Objective To evaluate the significance of the rapid / shallow breathing index as an indicator to 40 patients with severe pneumonia combined with acute respiratory failure underwent withdraw from mechanical ventilation.Methods Measurement of frequency / tidal volume ratio （f /VT） was made in patients with severe pneumonia combined with acute respiratory failure underwent withdraw from mechanical ventilation.Results 31 patients successfully withdrew from ventilation and the mean value of f/VT 78±21 significantly decreased than the mean value of f/VT 108±20 in 9 patients difficultly withdrew from ventilation （P0.05）. Additionally,29 patients in successful group have the value of f/VT under 105,but only 4 patients in difficult group. The sensitivity was calculated to be 93.54% and the specialty was 55. 56%.Conclusion Monitoring f /VT is a better index because of its simplicity and convenience,noninvasion and accuracy when severe pneumonia with acute respiratory failure patients undergo withdraw from mechanical ventilation,and it maybe significantly predict the outcome and suitable for basic hospital operation.