A Method for Noninvasive Determination of Inspiratory Resistance during Proportional Assist Ventilation

摘要

Currently available noninvasive methods for measuring inspiratory resistance (R_1) are difficult to implement or interpret during as- sisted mechanical ventilation on account of the confounding ef- fect of respiratory efforts (Pmus). We propose a simple method consisting of brief reductions in airway pressure (Paw) in the early part of the inflation phase (Pulse). Paw, flow (V), and volume (V) are measured at the beginning of the pulse (T_0), at the trough of the pulse (T_1) and at a point 0.1 s before T_0 (T_-1).