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Percent reduction of El in VV mode compared with CV mode at the end of ventilation when critical opening and closing pressures (Po and Pc, respectively) are equal (Po = Pc) or different (Po − Pc = 6 cmH2O) under 4 different combinations of closing and opening speeds: So = 0.11 and Sc = 0.011, So = Sc = 0.11, So = ∞ and Sc = 0.011, or So = ∞ and Sc = ∞.
