新生児のテインパノグラムと鼓膜所見
1993 年 3 巻 3 号 p. 325-328
詳細
1993 年 3 巻 3 号 p. 325-328
Studies were performed to vertify whether the fluid disappears shortly after birth with completeaeration, or it continuously exists for some period after birth.
Sixty-five infants (27 males and 38 females) out of137normally born infants at Ogikubo Hospitalfrom January to March in1992were included in this study. Every infant was examined withimpedance audiometry and otoscopy. Those procedures were carried out shortly after birth (thefirst check) and at discharge from hospital (the second check).
At the first check, 127 new-borns' ears showed type A tympanogram with the normal ear drumand3ears with type B. At the second check, 9infants dropped out of the study and111earsrevealed type A tympanogram with the normal ear drum and1ear type C. We concluded from ourstudy as follows:
1) In almost all new-borns, aeration of the middle ear is accomplished in a very short periodafter birth, probably within 2 to 20 hours.
2) There is no continuity from the fetal physiological fluid to pathologic exudate of the middleear.
