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BACKGROUND Despite numerous advances in critical care, the mortality of postinjury acute respiratory distress syndrome (ARDS) remains high. Recently, permissive hypercapnia (PHC) has been shown to be a viable alternative to traditional ventilator management in patients with ARDS. However, lowering tidal volume, as employed in PHC, below 5 cc/kg impinges upon anatomic dead space and precipitates a significant rise in PaCO2 The purpose of this study was to determine if continuous tracheal gas insufflation (cTGI) is a useful adjunct to PHC by lowering PaCO2, thus allowing adequate reduction in minute ventilation to achieve alveolar protection. METHODS Over a 5-year period, 68 trauma patients with ARDS were placed on permissive hypercapnia. Nine of these patients additionally received cTGI at 7 L/min. Arterial blood gas determinations and ventilatory parameters were examined immediately prior to the implementation of cTGI and after 6h. RESULTS The cTGI produced significant improvement in pH (7.25 +/- 0.03 to 7.33 +/- 0.03), PaCO2 (72 +/- 5 to 59 +/- 5 torr), tidal volume (7.9 +/- 0.6 to 7.2 +/- 0.6 cc/kg), and minute ventilation (13 +/- 1 to 11 +/- 1 L/min; P < 0.05). CONCLUSIONS Continuous TGI is a useful adjunct to permissive hypercapnia, allowing maintenance of an acceptable pH and PaCO2 while allowing further reduction in tidal volume and minute ventilation.
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