Clinical application of the flow-volume loop.

A convenient method for recording pulmonary function which allows for rapid graphic bedside analysis was presented. The method involves recording flow-volume (‘V-V) loop, in correct alignment to a previously determined FRC. FRC was measured by a rapid nitrogen dilution method. This method of recording pulmonary function affords a composite of TLC and all subdivisions with corresponding flow which can be recorded in a patient’s chart similar to ECGs. Normal and pathologic loop patterns are illustrated. A high statistical correlation of volumes and flows by the method was found when compared to conventional spirograms in 90 patients.