Doctors extracted “copious” amounts of mucus from his lungs. They put him on a noninvasive mechanical ventilation mask to help him breathe and he slept with it through the night, but was stable enough on Tuesday morning to use just high flows of supplemental oxygen delivered by a nasal tube.

Pope Francis' condition remained stable on Tuesday, and his prognosis remains reserved, according to the Vatican. The pope had needed medical intervention amid two episodes of "acute respiratory failure" on Monday,