最大吸气流量和用力深吸气量的测定与临床应用

Measurement of Maximal Inspiratory Flow and Forced Inspiratory Capacity and Its Clinical Application

探讨了由用力深吸气量－时间曲线（ＦＩＣ－ｔ曲线）测定最大吸气流量（Ｖ（ｉｍａｘ））与用力深吸气量（ＦＩＣ）的方法，并对３５例肺通气功能正常者和８９例慢性阻塞性肺病（ＣＯＰＤ）患者进行了Ｖ（ｉｍａｘ）与ＦＩＣ的测定，同时用改良Ｂｌａｃｋ法由功能残气（ＦＲＣ）位测定最大吸气口腔压（ＭＩＰ）。结果表明：Ｖ（ｉｍａｘ）、ＦＩＣ无论在正常组或ＣＯＰＤ组均与ＭＩＰ显著相关，二者于两组间均存在显著性差异，旦随着ＣＯＰＤ病情加重而降低。因此，作者认为Ｖ（ｉｍａｘ）、ＦＩＣ可作为评价吸气肌力的临床指标。

The methods of measuring the maximalinspiratory flow (V(imax)) and the forced inspiratory ca-pacity (FIC) via forced inspiratory capacity-time curve(FIC-t curve ) were investigated. BOth V(imax) and FICwere measured in 35 normal subjects and 89 patientswith chronic obstructive pulmonary disease(COPD).The maximal inspiratory pressure(MIP) was measuredsimultaneously at fuction residual capacity (FRC) levelby modified Black Method.The results showed thatthere is a linear relationship btween MIP and V(imax) orFIC in both normal subjects and patients with COPD.Normal subjects had a mean V(imax) and FIC much higherthan those of patients with COPD. The values of V(imax)and FIC in pat ients were also significantly correlatedto the severity of COPD. So we suggest that both V(imax)and FIC be used as clinical indices to reflect inspiratorymuscles strength.