Francis was treated with noninvasive mechanical ventilation and had a good response, the Vatican said Friday.Not long before the Vatican revealed his Friday bronchospasm, Vatican sources told CBS News the pope's health had improved,

ROME and LONDON -- Pope Francis suffered two episodes of "acute respiratory failure" on Monday, the Vatican said. The episodes were caused by a "significant accumulation of endobronchial mucus and consequent bronchospasm," the Vatican's press office said in a brief statement.