ROME – Pope Francis experienced a restful night after a day in which his health deteriorated dramatically, the Vatican has announced.

After experiencing a major downturn in his condition Saturday that required high oxygen treatment and blood transfusions, Pope Francis's condition appeared to stabilise even though it remains "critical".

A morning bulletin from the Vatican reported that “the Pope had a calm night and rested”.

The update comes a day after Pope Francis’s most serious medical crisis since being admitted to Rome’s Gemelli Hospital Feb. 14 for the treatment of bronchitis which for two weeks had left him breathless and unable to read prepared speeches.