TY - JOUR T1 - Aspiration of Dead Space in the Management of Chronic Obstructive Pulmonary Disease Patients With Respiratory Failure JF - Respiratory Care SP - 257 LP - 262 VL - 49 IS - 3 AU - You-Ning Liu AU - Wei-Guo Zhao AU - Li-Xin Xie AU - De-Sen Cao AU - Liang-An Chen AU - Jian-Peng Zhang AU - Bo Zhang AU - Ying-Min Ma AU - Yu-Zhu Li AU - Xin-Gang Zhang AU - Yan-Hong Jia Y1 - 2004/03/01 UR - http://rc.rcjournal.com/content/49/3/257.abstract N2 - INTRODUCTION: Carbon dioxide clearance can be improved by reducing respiratory dead space or by increasing the clearance of carbon-dioxide-laden expiratory gas from the dead space. Aspiration of dead space (ASPIDS) improves carbon dioxide clearance by suctioning out (during expiration) the carbon-dioxide-rich expiratory gas while replacing the suctioned-out gas with oxgenated gas. We hypothesized that ASPIDS would allow lower tidal volume and thus reduce exposure to potentially injurious airway pressures. METHODS: With 8 hemodynamically stable, normothermic, ventilated patients suffering severe chronic obstructive pulmonary disease we tested the dead-space-clearance effects of ASPIDS. We compared ASPIDS to phasic tracheal gas insufflation (PTGI) during conventional mechanical ventilation and during permissive hypercapnia, which was induced by decreasing tidal volume by 30%. The mean PaCO2 reductions with PTGI flows of 4.0 and 6.0 L/min and during ASPIDS (at 4.0 L/min) were 32.7%, 51.8%, and 53.5%, respectively. Peak, plateau, and mean airway pressure during permissive hypercapnia were significantly lower than during conventional mechanical ventilation but PTGI increased peak, plateau, and mean airway pressure. However, pressures were decreased during permissive hypercapnia while applying ASPIDS. Intrinsic positive end-expiratory pressure also increased with PTGI, but ASPIDS had no obvious influence on intrinsic positive end-expiratory pressure. ASPIDS had no effect on cardiovascular status. CONCLUSIONS: ASPIDS is a simple adjunct to mechanical ventilation that can decrease PaCO2 during conventional mechanical ventilation and permissive hypercapnia. ER -