The Vatican said the pope responded well to the treatment, with a good level of gas exchange, and remained conscious and alert at all times.

Pope Francis, 88, was placed on a non-invasive mechanical ventilator after a bronchospasm caused him to inhale vomit. His condition is “guarded.”

Pope Francis was described by doctors as being in stable condition Tuesday following additional respiratory difficulties a day prior, however, he continues to use periodic ventilation and his prognosis remains unclear.