Abstract
Received July 26, 2011 Revised September 15, 2011 Accepted September 23, 2011 Address for correspondence Myung-Whan Suh, MD Department of OtolaryngologyHead & Neck Surgery, College of Medicine, Dankook University, 359 Manghyang-ro, Dongnam-gu, Cheonan 330-715, Korea Tel +82-41-550-6469 Fax +82-41-556-1090 E-mail drmung@naver.com Background and ObjectivesZZSpontaneous nystagmus may have an influence on the results of sinusoidal harmonic acceleration (SHA) test, although it has not been ascertained through sufficient studies. This study evaluated the effect of spontaneous nystagmus on the gain, asymmetry and phase values of the SHA test. Subjects and MethodZZWe retrospectively analyzed 19 patients with acute unilateral vestibular weakness and spontaneous nystagmus (sn). All patients underwent a battery of vestibular testing including videonystagmography, bithermal caloric test, and SHA test. Gain, asymmetry, and phase were calculated with the conventional method without correcting for sn, thus the non-corrected SHA (nSHA). Then the same three parameters were calculated again after manually correcting for spontaneous nystagmus, thus the corrected SHA (cSHA). The two methods were compared with respect to gain, asymmetry and phase values. Correlation between the SHA test and caloric test was also analyzed. ResultsZZThe gain of nSHA was significantly larger than that of cSHA in all frequencies. There was no difference in the phase values between the two analysis methods. The asymmetry of nSHA was 2.8 times larger than that of cSHA. The asymmetry values of both nSHA and cSHA showed a significant correlation between the caloric test and degree of spontaneous nystagmus. ConclusionZZIt seems that the SHA test is significantly influenced by spontaneous nystagmus. Although correcting for spontaneous nystagmus may not always be necessary, we should consider the effect of spontaneous nystagmus when interpreting the SHA test results of a patient who has spontaneous nystagmus. Korean J Otorhinolaryngol-Head Neck Surg 2011;54:761-5
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Korean Journal of Otorhinolaryngology-Head and Neck Surgery
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
