基于RIP恒定比例校准方法测量人体通气量的可行性研究

目的:探讨人体在不同呼吸状态下,呼吸感应体积描记法(RIP)技术的恒定比例校准法用于测量人体通气量值的可行性以及恒定比例系数的确定。方法:在平静和规范用力两种呼吸方式下使用恒定比例校准法校准RIP系统,选择50个恒定比例系数,测量两种状态下的每次呼吸通气量,对比分析RIP系统与呼吸速度描记仪所测量的通气量值。结果:对于本试验的20名受试者,RIP系统测量平静呼吸方式下每次呼吸通气量值,KRC=1.3时,其通气量值相关性最高;用于测量用力呼吸方式下每次呼吸通气量值,KRC=0.9时,其通气量值相关性最高。测量两种呼吸方式的通气量,K值在一定范围内变化时相对误差和相关性差异不大。结论:平静呼吸模式下测量每次呼吸通气量值,恒定比例校准法可应用于精度要求不高的部分临床应用情况;规范用力呼吸模式下测量每次呼吸通气量值,恒定比例校准法可应用于偏重测量用力呼吸通气量值的临床应用。

RIP calibration method of constant proportion method in measuring ventilation

Objective： To investigate the feasibility and the identification of the constant proportion coefficient value K in measuring ventilation under the standardized forced breathing（SFB） and the natural breathing（NB） pattern with the constant proportion calibration method of Respiratory inductive plethysmography. Methods： The volunteers were calibrated with the constant proportion method under NB and SFB patterns by selecting 50 constant proportion coefficients value of K. To comparatively analyze ventilations measured from RIP system and pneumotachometer （PTM）. Results： When the value of KRC is 1.5 ,the result has the largest correlation among 20 volunteers using constant proportion calibrating method in NB. In measuring ventilations of NB, while the value of KRC is 0.9, the correlationis highest. The correlation and relative error have slight difference in measuring ventilation of NB and SFB when K changes in certain scope. Conclusions： In measuring the ventilation of each breath under the NB pattern, the constant proportion calibration method can be used in those clinical applications with lower demand on precision. In SNF pattern, the constant proportion calibration method can be used in those clinical purposes prefer measuring the ventilation of forced breathing.