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Evolution of lung volumes under conventional ventilation and high frequency percussive ventilation (HFPV). Abbreviations: conv conventional ventilation, expi expiratory hold during HFPV, inspi inspiratory hold during HFPV, Non non-aerated lung volume, Norm normally aerated lung volume, Over overdistended lung volume, Poor poorly aerated lung volume. Data are presented as percentages of total lung volume. *P < 0.05 versus conventional ventilation
