Abstract
A comparison of periodic hyperinflations or “sighs” and positive expiratory pressure plateau (PEFP) was done in ten post-operative cardiac patients. Highly significant decreases in shunts (Qs/Qt) and highly significant increases in PaO2 occurred with PEPP. Improvement in ventilation. occurred with “sighs” but no change in oxygenation or perfusion was observed. A BIRD respirator was used and was adapted to PEPP.
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