Skip to main content
Figure 1 | Critical Care

Figure 1

From: Imposed work of breathing during high-frequency oscillatory ventilation: a bench study

Figure 1

Schematic drawing of the experimental set-up. (a) The ventilator circuit of a Sensor Medics 3100 A/B oscillator is connected to a piston-driven test lung by an endotracheal tube. PETT and PAW, pressures in the test lung and in the ventilator circuit, respectively. Flow is measured at the proximal end of the endotracheal tube. HH, heated humidifier; HFOV, high-frequency oscillatory ventilation. (b) Simulated spontaneous breath. (c) Modified Campbell diagram, where A is the start of inspiration and B is the end of inspiration. The grey area represents the imposed inspiratory work of breathing, calculated using the modified Campbell diagram. CDP, continuous distending pressure.

Back to article page