文摘
Introduction While non-invasive ventilation aimed at avoiding intubation has become the modality of choice to treat mild to moderate acute respiratory acidosis, many severely acidotic patients (pH 2 removal (ECCO2R) could prove to be an alternative. The present animal study tested in a systematic fashion technical requirements for successful ECCO2R in terms of cannula size, blood and sweep gas flow. Methods ECCO2R with a 0.98聽m2 surface oxygenator was performed in six acidotic (pH Results Amelioration of severe respiratory acidosis was only feasible when blood flow rates of 750 to 1000聽mL/minute (19Fr catheter) were used. Maximal CO2-elimination was 146.1鈥壜扁€?2.6聽mL/minute, while pH increased from 7.13鈥壜扁€?.08 to 7.41鈥壜扁€?.07 (blood flow of 1000聽mL/minute; sweep gas flow 16聽L/minute). Accordingly, a sweep gas flow of 8聽L/minute resulted in a maximal CO2-elimination rate of 138.0鈥壜扁€?6.9聽mL/minute. The 14.5Fr catheter allowed a maximum CO2 elimination rate of 77.9聽mL/minute, which did not result in the normalization of pH. Conclusions Veno-venous ECCO2R may serve as a treatment option for severe respiratory acidosis. In this porcine model, ECCO2R was most effective when using blood flow rates ranging between 750 and 1000聽mL/minute, while an increase in sweep gas flow from 8 to 16聽L/minute had less impact on ECCO2R in this setting.