Bell麻痺とアブミ骨筋反射

その2.麻痺経過におけるアブミ骨筋反射各種パラメーター値の推移について

抄録

In 34 cases with unilateral Bell's palsy which had both normal hearing and tympanogram of Type A, crossed SR was evaluated chronologically under the same stimulus range of sound pressure level by means of the oscilloscope to record the entire pattern of sound-induced waveform in addition to SR threshold. Amplitude, reflex contraction time (RCT) and reflex relaxation time (RRT) induced were set up for measurements as a parameter.
The present investigations are chiefly concerned with how these parameters, described above, change according to the time course of facial palsy, on one hand, and on the other hand, which parameters can be the best indicators to reflex the recovery of the paralysis.
Results obtained are as follows. 1. As for chronologic changes of SR parameters, on the paretic side, SR threshold decreases rapidly, amplitude increases, RCT is shortened and RRT is prolonged gradually according to the time course of facial palsy. 2. On the normal side, SR threshold increases, amplitude decreases and RRT is shortened gradually according to the time course of facial palsy. 3. RRT, on the normal side, is prolonged temporarily within 20 days after the onset of facial palsy. 4. Amplitude and RRT on the paretic side, and RRT on the normal side can be used for the prognostic diagnosis of facial palsy as the one of the best parameters to indicate the rcovery signs of facial palsy. 5. The function of stapedius nerve and muscle on the paretic side is reflected indirectly in SR parameters on the normal side. Therefore, if the time course of SR parameters on the normal side is investigated, the time course of the function of stapedius nerve and muscle on the paretic side can be made clear even before the restoration of SR.