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  Indian J Med Microbiol
 

Figure 4: Noninvasive techniques based on occlusions using the ventilator. On the left (a) Measurement of airway occlusion pressure (P0.1) and negative deflection in airway pressure during a whole breath occlusion (Pocc) are shown on flow, airway pressure (Paw), and esophageal pressure (Peso) tracings. On the right (b) Changes in Paw, Flow and Peso over time during an end-inspiratory occlusion together with the calculation of pressure muscle index (PMI) as the difference between plateau pressure (Pplat) and peak pressure (Ppeak). Of note, because of the substantial contribution of muscular pressure to lung inflation in the example shown, Pplat is higher than Ppeak when respiratory muscles are relaxed at the end of inspiration (horizontal line in Paw and Peso)

Figure 4: Noninvasive techniques based on occlusions using the ventilator. On the left (a) Measurement of airway occlusion pressure (P0.1) and negative deflection in airway pressure during a whole breath occlusion (Pocc) are shown on flow, airway pressure (Paw), and esophageal pressure (Peso) tracings. On the right (b) Changes in Paw, Flow and Peso over time during an end-inspiratory occlusion together with the calculation of pressure muscle index (PMI) as the difference between plateau pressure (Pplat) and peak pressure (Ppeak). Of note, because of the substantial contribution of muscular pressure to lung inflation in the example shown, Pplat is higher than Ppeak when respiratory muscles are relaxed at the end of inspiration (horizontal line in Paw and Peso)