Comparison of lung protection strategies using conventional and high-frequency oscillatory ventilation

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Abstract
This study compared pathophysiological and biochemical indexes of acute lung injury in a saline-lavaged rabbit model with different ventilatory strategies: a control group consisting of moderate tidal volume (Vt) (10–12 ml/kg) and low positive end-expiratory pressure (PEEP) (4–5 cmH2O); and three protective groups: 1) low Vt (5–6 ml/kg) high PEEP, 2–3 cmH2O greater than the lower inflection point; 2) low Vt (5–6 ml/kg), high PEEP (8–10 cmH2O); and 3) high-frequency oscillatory ventilation (HFOV). The strategy using PEEP > inflection point resulted in hypotension and barotrauma. HFOV attenuated the decrease in pulmonary compliance, the lung inflammation assessed by polymorphonuclear leukocyte infiltration and tumor necrosis factor-α concentration in the alveolar space, and pathological changes of the small airways and alveoli. Conventional mechanical ventilation using lung protection strategies (low Vt high PEEP) only attenuated the decrease in oxygenation and pulmonary compliance. Therefore, HFOV may be a preferable option as a lung protection strategy.

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