Sudden spontaneous lesion of aural function

Comparison of carbogen inhalation and intravenous heparin infusion therapies in idiopathic sudden sensorineural hearing loss

The effect of carbogen (5% carbon dioxide and 95% oxygen) inhalation and intravenous heparin on sudden sensorineural hearing loss was compared. Forty-four patients received the former, 43 the latter treatment, respectively. The patients were unselected patients of the clinic. The PTA (0.5-2.0 kHz) at the pretreatment stage was 62 dB in the heparin and 55 dB in the carbogen group. One month later the corresponding figures were 34 and 32 dB, the difference being statistically not significant. Thus neither of these methods proved superior in the treatment of sudden sensorineural hearing loss.

Sudden deafness and labyrinthine window ruptures. Audio-vestibular observations

In 1971, one of the authors reported sudden deafness associated with labyrinthine window membrane ruptures. Eighteen additional cases have been explored surgically since then. Data on 21 cases are presented. Sudden profound cochlear deafness has now been encountered in 21 cases which were surgically explored. In 15 instances, fistulae of round, oval, or both windows were encountered and repaired. In 10 of the 15, there was a definite history of sudden exertion or trauma prior to onset. The oval window alone was ruptured in nine patients, the round window alone in one, and both windows were ruptured in five patients. The oldest patient was 62 years and the youngest 11 years of age. Differential audiological studies showed profound losses in all cases. Almost every case was studied by pure tone AC-BC and speech audiometry, Békésy, and impedance tests. Whenever possible other audiologic tests, such as recruitment, tone decay, and SISI were performed. These findings are presented in detail. Vestibular function was studied by electronystagmography (ENG) in 15 of the 21 cases surgically explored. There was evidence of vestibular dysfunction in almost every case with sudden hearing loss. Significant ENG details are presented. Surgical repairs of ruptured window membranes were followed by improvements in some of the patients. Postoperative audiologic data are presented. The theoretical aspects include discussion of possible cerebrospinal fluid (CSF) perilymph pathways between cochlear aqueduct and scala tympani and between internal auditory meatus and scala vestibuli. It is concluded that spontaneous labyrinthine window ruptures must now be added to the etiologic factors in “sudden hearing loss.” It is premature to set down criteria for surgical intervention in such cases. Further careful studies are necessary.