Long-term observation of ears with reduced middle ear pressure.

@article{Renvall1978LongtermOO,
  title={Long-term observation of ears with reduced middle ear pressure.},
  author={Ulf Renvall and G. Liden and S. Jungert and E. Nilsson},
  journal={Acta oto-laryngologica},
  year={1978},
  volume={86 1-2},
  pages={
          104-9
        }
}
335 ears from 210 childred in which tympanometry initially indicated middle ear pressure less than or equal to -100 mm H2O or a flat tympanogram have been reinvestigated 3 years later. When the inital investigation was performed all children were 7 years old. The present study reveals that 25% of these ears still have middle ear pressure less than or equal to -100 mm H2O and 16% middle ear pressure less than or equal to -150 mm H2O. In normal material of the same age group 9% have middle ear… CONTINUE READING

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