Figure 5
From: Effects of the components of positive airway pressure on work of breathing during bronchospasm
Effects of intravenous methacholine infusion on auto-positive end-expiratory pressure (auto-PEEP), end-expiratory transpulmonary pressure (Ptp, exp), and end-expiratory abdominal pressure (Pabd, exp). Methacholine induced no significant hyperinflation according to the auto-PEEP and Ptp, exp measurements. However, expiratory muscle activity significantly increased after methacholine administration, as demonstrated by the increase in Pabd, exp. *P < 0.01.