Computer analysis of fixation-suppression of caloric nystagmus.
Effects of the ocular fixation upon caloric nystagmus were quantitatively analyzed and compared between normal subjects and patients by using a PDP 11/40 computer. The slow-phase velocity was the best parameter to separate normal from abnormal visual fixation. An analysis of caloric nystagmus with failure of fixation-suppression (FFS) made it possible to classify patterns of FFS into three types. The combination of FFS with impairment of the optokinetic responses provides a useful diagnostic tool with respect to lesions located between the brain stem and the cerebellum.
D000328:Adult; D001932:Brain Neoplasms / Q000175:diagnosis; D001933:Brain Stem / Q000503:physiopathology; D002150:Caloric Tests; D002531:Cerebellum / Q000503:physiopathology; D002561:Cerebrovascular Disorders / Q000175:diagnosis*; D003201:Computers; D004584:Electronystagmography; D005260:Female; D005403:Fixation, Ocular; D006801:Humans; D008297:Male; D008875:Middle Aged; D014724:Vestibular Function Tests