Fig. 1From: Physiological effects of adding ECCO2R to invasive mechanical ventilation for COPD exacerbationsFlowchart of the study. PaCO2target: PaCO2 corresponding to a pH value of 7.40, based on the Henderson-Hasselbach equation, governing the relationship between the PaCO2, pH and bicarbonates plasma values. In cases of mixed respiratory and metabolic acidosis, a PaCO2target value of 40 mmHg was retained. RR: respiratory rateBack to article page