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Table 3 Experimental Rohrer’s constants for ETT, and lung airways

From: The effects of pressure- versus volume-controlled ventilation on ventilator work of breathing

  ETT [35] Lung airways
Normal [36] COPD [37]
K1 (cmH2O.L−1.s) 0.85 1.85 5.03
K2 (cmH2O.L−2.s2) 6.35 0.43 2.69