Fig. 2From: High-flow nasal therapy versus noninvasive ventilation in COPD patients with mild-to-moderate hypercapnic acute respiratory failure: study protocol for a noninferiority randomized clinical trialStudy flow chart according to CONsolidated Standards of Reporting Trials. COPD chronic obstructive pulmonary disease, HFNT high-flow nasal therapy through nasal cannula, ICU intensive care unit, NIV noninvasive ventilation, PaCO2 arterial partial pressure of carbon dioxideBack to article page