Objective: To compare the effects of BiPAP ventilation combined with lung recruitment maneuvers (LRM) with low tidal volume A/C ventilation in patients with acute respiratory distress syndrome (ARDS).
Methods: A prospective, randomized comparison of BiPAP mechanical ventilation combined with lung recruitment maneuvers (test group) with low tidal volume A/C ventilation (control group) was conducted in 28 patients with ARDS. FiO2/PaO2 ratio, respiratory system compliance (Cs), central venous pressure (CVP), duration of ventilation support were recorded at 0 h, 48 h and 72 h separately. The ventilation associated lung injury and mortality at 28 d were also recorded.
Results: The FiO2/PaO2 ratio were (298+/-16) and (309+/-16) cm H2O, Cs were (38.4+/-2.2) and (42.0+/-1.3) ml/cm H2O, CVP were (13.8+/-0.8) and (11.6+/-0.7) cm H2O in the test group at 48 h and 72 h separately. In the control group, FiO2/PaO2 ratio were (212+/-12) and (246+/-17) cm H2O, Cs were (29.5+/-1.3) and (29.0+/-1.0) ml/cm H2O, CVP were 18.6+/-1.1 and (16.8+/-1.0) cm H2O. The results were better in the test group as compared with the control group (t=10.03-29.68, all P<0.01). The duration of ventilation support in the test group was shorter than the control group [(14+/-3) d vs (19+/-3) d, t=4.80, P<0.01]. The mortality in 28 d and ventilation associated lung injury were similar in the two groups.
Conclusion: The results show that combination of LRM with BiPAP mode ventilation, as compared with the control group, contributes to improved FiO2/PaO2 ratio, pulmonary compliance, stable hemodynamic and shorter duration of ventilation support in patients with ARDS.
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