Pope Francis’s health worsened significantly Friday afternoon as his respiratory condition was irritated and necessitated the return of mechanical ventilation. Earlier in the day, the pontiff “experienced an isolated episode of bronchospasm,

According to a Feb. 28 medical bulletin from the Holy See, after a morning spent in prayer, receiving the Eucharist, and doing respiratory physiotherapy, Pope Francis experienced in the early afternoon “an isolated crisis of bronchospasm” — a tightening of the muscles that line the airways in the lungs, causing wheezing and coughing.

After experiencing progressive improvement the past few days, Pope Francis experienced "an isolated crisis of bronchospasm" which led to coughing and "vomiting with inhalation," which worsened his respiratory condition, the Vatican said.