Figure 4From: Bench experiments comparing simulated inspiratory effort when breathing helium-oxygen mixtures to that during positive pressure support with air Example flow versus time curves measured over two breathing cycles by the pressure support ventilator for a) medical air and b) helium/oxygen 78/22 supplied with zero pressure support. Curves were obtained for a breathing chamber compliance of 0.05 L/cm H2O, a resistive loss coefficient of 43.0, a respiratory rate of 25 breaths per minute, and a tidal volume of 700 ml.Back to article page