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Background: Right ventricular (RV) failure is a common complication in moderate-to-severe acute respiratory distress syndrome (ARDS). RV failure is exacerbated by hypercapnic acidosis and overdistension induced by mechanical ventilation. Veno-venous extracorporeal CO removal (ECCOR) might allow ultraprotective ventilation with lower tidal volume (V) and plateau pressure (P). This study investigated whether ECCOR therapy could affect RV function.
Methods: This was a quasi-experimental prospective observational pilot study performed in a French medical ICU. Patients with moderate-to-severe ARDS with PaO/FiO ratio between 80 and 150 mmHg were enrolled. An ultraprotective ventilation strategy was used with V at 4 mL/kg of predicted body weight during the 24 h following the start of a low-flow ECCOR device. RV function was assessed by transthoracic echocardiography (TTE) during the study protocol.
Results: The efficacy of ECCOR facilitated an ultraprotective strategy in all 18 patients included. We observed a significant improvement in RV systolic function parameters. Tricuspid annular plane systolic excursion (TAPSE) increased significantly under ultraprotective ventilation compared to baseline (from 22.8 to 25.4 mm; p < 0.05). Systolic excursion velocity (S' wave) also increased after the 1-day protocol (from 13.8 m/s to 15.1 m/s; p < 0.05). A significant improvement in the aortic velocity time integral (VTIAo) under ultraprotective ventilation settings was observed (p = 0.05). There were no significant differences in the values of systolic pulmonary arterial pressure (sPAP) and RV preload.
Conclusion: Low-flow ECCOR facilitates an ultraprotective ventilation strategy thatwould improve RV function in moderate-to-severe ARDS patients. Improvement in RV contractility appears to be mainly due to a decrease in intrathoracic pressure allowed by ultraprotective ventilation, rather than a reduction of PaCO.
Download full-text PDF |
Source |
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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7788545 | PMC |
http://dx.doi.org/10.1186/s13613-020-00784-3 | DOI Listing |
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