Near-Fatal Asthma

By Mark D. Siegel, MD, FCCP

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Figure 7. Changes in ventilator settings and their impact on I:E ratio and TE. Note that doubling the inspiratory flow rate (I) causes a dramatic decrease in the I:E ratio but only a modest increase in TE. In contrast, a 40% decrease in the respiratory rate (II) not only decreases the I:E ratio but also substantially increases the TE. RR = respiratory rate; PIFR = peak inspiratory flow rate.

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