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Abstract
Tympanograms were recorded during compression of cervical veins in 19 normal ears to investigate whether pressure elevation in the middle and inner ears affects acoustic impedance. Upon cervical compression, the peak pressure of the tympanogram shifted to the positive pressure side. The peak amplitude of the tympanogram also changed in a manner similar to that after stapedius muscle contraction. These results suggest that the impedance changes caused by cervical compression reflected changes in both perilymphatic pressure and middle ear pressure.