The world's longest survivor of a five-organ transplant was in critical condition Tuesday after suffering a drop in blood pressure following a surgical procedure, hospital officials said.

Tabatha Foster, 31/2, of Madisonville, Ky., is in the intensive care unit of Children's Hospital of Pittsburgh.Doctors on Monday performed a routine surgical procedure to change drainage tubes that had been inserted last month to relieve a buildup of bile in Tabatha's transplanted liver, hospital spokeswoman Lynn McMahon said.

The procedure went smoothly, but Tabatha's blood pressure dropped once she was back in her room and she had trouble breathing.