effect of endoscopic sinus surgery on Eustachian tube function

Twenty patients [40 ears] who have undergone endoscopic sinus surgery, were subjected to tympanometry measures, preoperatively and 1, 3, and 5 days after surgery. Tympanometric records displayed significantly increased negativity on the early post-operative days [p< 0.01] with a peak pressure of -70.3 daPa preoperatively, -135.8 daPa one day after surgery, and -112.7 daPa 3 days after surgery, while 5 days after surgery they returned to normal with a peak pressure of -48.1 daPa. Pressure changes are attributed to nasal pack pressure as well as postoperative surgical edema