VATICAN CITY (RNS) – In a statement from the Vatican, doctors at the Gemelli Hospital in Rome where Pope Francis is being treated for pneumonia and bronchitis say that the pontiff suffered a respiratory crisis Saturday (Feb. 22) requiring an intervention to support his breathing. 

“The conditions of the Holy Father continue to be critical,” the statement read, adding that the pope had a “prolonged asthmatic respiratory crisis,” that required the application of high flow oxygen. 

Francis was also was given blood transfusions, according to the Vatican statement, after blood tests revealed that Francis was suffering from thrombocytopenia, meaning that the platelet count in his blood is too low, a condition the doctors said is associated with anemia. Infections and medical treatment may lower platelet count. 

Despite the concerns, the statement said that Francis was still alert and out of bed. “The Holy Father continues to be vigilant and spent the day in his armchair even if he was more in pain than yesterday,” the statement said. “At the moment the prognosis is guarded.”

Francis admitted himself to the hospital on February 14 after struggling with bronchitis and difficulty breathing for the previous 10 days. At the time he was admitted, his doctors said he was suffering from a polymicrobial infection that caused pneumonia in both lungs.

At 88 years old, Francis is among the oldest pontiffs to reign in the church’s history and has a long history of respiratory illness. As a youth in Argentina, he had a portion of his right lung removed and has since then been susceptible to respiratory tract infections in his lungs and respiratory tract.

He had also intermittently suffered from sciatica, cataracts and chronic knee pain. Visitors to the Vatican are accustomed to seeing the pope struggle to walk when not seated in a wheelchair. In recent weeks he has allowed others to read his homilies for him at Mass, and he has skipped his public audiences and weekly Angelus prayers from the window overlooking .

At a press conference at the Gemelli Hospital on Friday (Feb. 21), his doctors said that the pontiff “is not out of danger,” adding that while he showed slight improvement, he remained in a critical condition.