JPII has suffered "cardiocirculatory collapse and shock"

From the AP:

Pope John Paul II suffered heart failure during treatment for a urinary tract infection and was in "very serious" condition on Friday, the Vatican said. Vatican spokesman Joaquin Navarro-Valls said in a statement that the pope, who was being treated at the Vatican, was given cardio-respiratory assistance after his heart failed Thursday afternoon. "This morning the condition of the Holy Father is very serious," the statement said.

Update: Reuters reports that "Pope John Paul was in a 'very grave' condition on Friday and appeared close to death after suffering heart failure, the Vatican said in a statement. ... The Vatican statement said the Pope was still 'conscious, lucid and tranquil' and had celebrated Mass with his close aides as dawn broke on Friday after deciding that he did not want to return to hospital for treatment."