Pope Francis' condition appeared to stabilize on Tuesday morning after medical intervention amid two episodes of "acute respiratory failure" on Monday, Vatican sources told ABC News. The pope, 88, was taken off noninvasive mechanical ventilation and resumed receiving supplemental oxygen through a nasal tube,

Pope Francis suffered two episodes of "acute respiratory insufficiency" and was put back on non-invasive mechanical ventilation, the Vatican said on Monday evening. The muscles in his airways had spasmed,

Francis is being treated with supplemental oxygen to assist him with breathing, the Vatican said Tuesday, a day after he suffered two episodes of acute respiratory failure.