Abstract
Congenital factor XI deficiency is a rare intrinsic coagulation factor. We treated a 67-year-old man with abdominal aortic aneurysm, in whom activated partial thromboplastin time (APTT) found to be prolonged preoperatively. After fresh frozen plasma (FFP) was given before surgery, aneurysm was successfully replaced by a woven Dacron graft. No bleeding tendency was noted during the operation and FFP was also administered during and after surgery. The patient recovered without incident and left the hospital 13 days after the operation. Since several days are required to determine factor XI activity, APTT is useful as a parameter of coagulation factor activity in the perioperative period.
