Premature Reversal Caloric Nystagmus in a Patient withMedulloblastoma, Originated from the 4th Ventricle.
- Author:
Hyung LEE
1
;
Jang Joon LEE
;
Sang Sub JANG
;
Seung Hwan LEE
;
Jeong Geun LIM
;
Sang Doe YI
;
Young Choon PARK
Author Information
1. Department of Neurology, Keimyung University, School of Medicine.
- Publication Type:Original Article
- Keywords:
Second phase nystagmus;
Caloric stimulation;
Premature reversal caloric nystagmus;
Medullobalstoma
- MeSH:
Caloric Tests;
Humans;
Korea;
Medulloblastoma;
Nystagmus, Physiologic*;
Vestibular Nuclei;
Water
- From:Journal of the Korean Neurological Association
2000;18(6):794-797
- CountryRepublic of Korea
- Language:Korean
-
Abstract:
Some individuals may demonstrate a secondary phase nystagmus (SPN) following the caloric irrigation. It has been stated that if a SPN begins prior to 140 seconds after the onset of caloric stimulation and if the magnitude of the slow phase velocity is greater than 6 degrees/sec, then a premature reversal caloric nystagmus (PRCN) is said to exit. Thus far, there have been no reports describing PRCN in Korea. We described a typical PRCN in a patient with medulloblastoma within the 4th ventricle. The patient had a gaze-evoked horizontal and upbeating nystagmus. However, there was no indication of spontaneous nystagmus. A monothermal caloric test was administered. The initial left beating primary phase nystagmus was subsided at 60 seconds after right cold water stimulation and at 110 seconds, a right beating SPN with 14 degrees/sec of slow phase velocity was appeared and was continuous for 240 seconds. Although the precise mechanism of PRCN is unknown, vestibular nuclei damage may be related.
