Pope John Paul II last night underwent successful surgery to his windpipe after being rushed to the hospital for the second time in a month with what the Vatican described as “acute” respiratory difficulties. His spokesperson said the 30-minute tracheotomy was conducted without problem and his condition was described as serene and tranquil. He is breathing with the aid of a respirator, according to Italian media. The tracheotomy will prevent him from speaking for more than brief periods and may require a prolonged hospital stay. The Vatican has played down the procedure, calling the tracheotomy “elective.” But outside doctors said it’s likely a result of pneumonia, which is particularly life-threatening for elderly patients with Parkinson’s.