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Analysis of Patients with Severe ARDS on VV ECMO Treated with Inhaled NO: A Retrospective Observational Study.
Journal of Clinical Medicine 2024 March 9
(1) Background : This retrospective study focused on severe acute respiratory distress syndrome (ARDS) patients treated with veno-venous (VV) extracorporeal membrane oxygenation (ECMO) and who inhaled nitric oxide (NO) for pulmonary arterial hypertension (PAH) and/or right ventricular failure (RV failure). (2) Methods : Out of 662 ECMO-supported patients, 366 received VV ECMO, including 48 who inhaled NO. We examined the NO's indications, dosing, duration, and the ability to lower PAH. We compared patients with and without inhaled NO in terms of mechanical ventilation duration, ECMO weaning, organ dysfunction, in-hospital mortality, and survival. (3) Results : Patients received 14.5 ± 5.5 ppm NO for 3 days with only one-third experiencing decreased pulmonary arterial pressure. They spent more time on VV ECMO, had a higher ECMO weaning failure frequency, and elevated severity scores (SAPS II and TIPS). A Kaplan-Meier analysis revealed reduced survival in the NO group. Multiple variable logistic regression indicated a twofold increased risk of death for ARDS patients on VV ECMO with NO. We observed no increase in continuous renal replacement therapy. (4) Conclusions : This study suggests that persistent PAH and/or RV failure is associated with poorer outcomes in severe ARDS patients on VV-ECMO, with an inhaled NO responder rate of only 30%, and it does not impact acute kidney failure rates.
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