Abstract
The static acoustic impedance of the chinchilla ear was measured in 50 animals, using the Grason–Stadler model 1720 Otoadmittance meter. The mean acoustic impedance in the awake animal was found to be 747 acoustic ohms. The standard deviation was 171 acoustic ohms. Acoustic impedance measures were obtained under the influence of various doses of Diabutal. The results indicate that there in an increase in negative pressure in the middle ear and concommitant decrease in acoustic impedance following administration of this anesthetic. The magnitude of the change in acoustic impedance was dependent upon the dosage administered. In addition, various aspects of the chinchilla tympanogram are discussed. Subject Classification: 65.24, 65.22.
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