摘要:

The ability of promontory testing (PT) to differentiate a retrocochlear from a cochlear lesion in a group of 88 patients having unilateral sensorineural hearing loss was assessed. Promontory stimulation was performed, using the Nucleus Promontory Stimulator (model Z10012, Cochlear Corporation, Melbourne, Australia), by placing a needle electrode transtympanically on the basal turn of the cochlea. Patients with measurable hearing gave inconsistent results. Patients who had undergone eighth nerve section or translabyrinthine removal of acoustic neuroma were used as controls. They had no perception of sound in response to electrical stimulation, and were unable to perform any part of the PT. Of nine patients with anacusis secondary to an acoustic neuroma, six were unable to perceive sound in response to electrical stimulation or perform any aspect of the PT. Of the three patients able to perceive sound, only one could perform the temporal difference limen (TDL) and gap detection (GAP) test. In patients with total deafness from other causes, 80 percent (24\30) were able to perceive sound with electrical stimulation, 46 percent (14\30) performed TDL, and 70 percent 21\30) performed the GAP tests. In patients with unilateral total deafness, promontory testing may aid in differentiating retrocochlear from cochlear lesions and help identify patients at risk for acoustic neuroma.

ISSN:0192-9763    

出版商:OVID    

年代:1994

数据来源: OVID

摘要:

Intraoperative facial nerve monitoring has been accepted as a valuable adjunctive modality to be employed in a variety of neurotologic and skull base surgical procedures. However, the role that electrical or mechanical stimulation assessment plays in chronic ear surgery is less well defined, especially in a residency training program. In this study, 250 consecutive operative cases of chronic otitis media, with and without cholesteatoma were monitored with the Xomed-Treace Nerve Integrity Monitor, NIM-2 system. Data regarding electrophysiologic monitoring parameters; electromechanical artifact, including system failure; and surgical outcome were analyzed. Although not a substitute for anatomic identification of the facial nerve, intraoperative monitoring provides an additional technique to optimize resident surgical education.

ISSN:0192-9763    

出版商:OVID    

年代:1994

数据来源: OVID

摘要:

Acoustic neuroma in the pregnant patient has been described infrequently. The symptoms of acoustic neuroma can commence or worsen during the last 3 or 4 months of pregnancy. In women, acoustic tumors have been shown generally to be larger and more vascular, and some acoustic tumors contain estrogen receptors. This is a report our management of two patients with acoustic neuroma who presented early pregnancy. Surgery was delayed to the second trimester in each, to avoid spontaneous abortion. Both patients underwent translabyrinthine tumor removal at 18-19 weeks gestation, and each had an uncomplicated postoperative course. Examination of tumor for estrogen receptors was performed for the second patient and was negative. Uncomplicated acoustic neuroma surgery can be performed in pregnant patients during the second trimester.

ISSN:0192-9763    

出版商:OVID    

年代:1994

数据来源: OVID

ISSN:0192-9763    

出版商:OVID    

年代:1994

数据来源: OVID

ISSN:0192-9763    

出版商:OVID    

年代:1994

数据来源: OVID

ISSN:0192-9763    

出版商:OVID    

年代:1994

数据来源: OVID

ISSN:0192-9763    

出版商:OVID    

年代:1994

数据来源: OVID

ISSN:0192-9763    

出版商:OVID    

年代:1994

数据来源: OVID

ISSN:0192-9763    

出版商:OVID    

年代:1994

数据来源: OVID