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Fig. 3 | Critical Care

Fig. 3

From: Flow Index: a novel, non-invasive, continuous, quantitative method to evaluate patient inspiratory effort during pressure support ventilation

Fig. 3

Procedure used to calculate Flow Index from the descending inspiratory portion of the flow waveform. Flow waveforms at the three different pressure support levels. The grey circles indicate the sampled inspiratory flow values, while the vertical lines indicate the cutting points used to select the descending inspiratory portion of the flow waveform. The red line shows the fitted model, calculated using Eq. 2 (detailed explanation in text). PSmin = minimum pressure support, PSbase = baseline pressure support, PSmax = maximum pressure support

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Critical Care

ISSN: 1364-8535