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Patients with mild acute respiratory distress syndrome (ARDS) and sustained hypocapnia had higher mortality rates than those with more severe ARDS, according to study results published in the journal CHEST. When hospital outcomes were analyzed, there was no association between arterial CO2 levels and clinical outcomes. However, ICU mortality was higher in patients with mild to moderate ARDS with sustained hypocapnia versus sustained normocapnia (38% vs 27%, respectively).
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