MONACO, Monaco, March 28 (UPI) -- Doctors attending Monaco's ailing Prince Rainier said Monday his condition has stabilized, but he remains in serious condition, the BBC reported.
The 81-year-old prince is suffering from lung, heart and kidney problems, and has been on a respirator since his admission to a Monaco hospital March 7. Last Tuesday, his condition suddenly deteriorated.
A health statement issued by the palace said the prognosis was "very reserved," and "the state of health of (Rainier) remains worrying."
Rainier has had heart and respiratory problems for 10 years and has been hospitalized several times in recent months.
The prince's family celebrated a private mass in the palace chapel Sunday, one day after Pope John Paul II -- who is very ill as well -- sent a blessing offering "warm wishes" to the prince.
His three children, Crown Prince Albert, 47, Princess Caroline, 48, and Princess Stephanie, 40, have been at his bedside since last week.