ROME (AP) — Pope Francis was conscious but still receiving high flows of supplemental oxygen Sunday following a respiratory crisis and blood transfusions, as he remains in critical condition with a complex lung infection, the Vatican said.

“The night passed quietly, the pope rested,” Vatican spokesman Matteo Bruni said in an early statement.

Further clinical tests were being performed on the 88-year-old pope, who had part of one lung removed as a young man, and a more detailed medical update was expected later Sunday.

On Saturday, Francis suffered a prolonged asthmatic respiratory crisis that required “high flows” of oxygen to help him breathe through a nasal tube. He also received blood transfusions after tests showed low counts of platelets, which are needed for clotting, the Vatican said.

Doctors said Saturday his prognosis was “reserved.”