Figure 2.

a) The relationship between pressure drop and flow rate, and b) the inspiratory effort during simulated unassisted spontaneous breathing at a fixed tidal volume (Vt) and respiratory rate (RR) are compared between non-linear (2xRp5) and nominally linear (2xFilter) airway resistances for medical air and for helium/oxygen 78/22.

Martin et al. BMC Pulmonary Medicine 2012 12:62   doi:10.1186/1471-2466-12-62
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