The results of tests for vestibular function performed on 142 cases having vertigo after various head injuries were reported in this paper.
Grades of head injuries were classified as, (a) simple injuries (35%), (b) cerebral concussion (42%), (c) cerebral contusion (53%), and (d) intracranial hemorrhage (12%).
Vertiginous attacks, either true vertigo or dizziness, were mostly of postural type.
Used test methods were as follows:
(a) Tests for spontaneous, positional and positioning nystagmus,
(b) Mann's modified Romberg's test,
(c) Standing test on one leg,
(d) Fukuda's writing test with closed eyes,
(e) Fukuda's stepping test,
(f) Hallpike's caloric test.
After these examinations it was clarified that, about 83% of tested cases were disordered, among whom about 40% were due to peripheral and about 43% were due to central vestibular lesions.
Audiometrical examinations revealed that, cases of normal hearing were about 4%, unilateral hear ing deficiencies were about 8%, and bilateral hearing deficiencies were about 88% of tested cases.
E.E.G. test revealeds that, normal record were obtained in about 24%, borderline records about 56%, and abnormal record about 20% of testeds cases.
Post-traumatic vertigo might be said as a sense of confusion due to dysequillibrium owing to vestibular disorder.
Borderline or abnormal record in E.E.G., being different from which observed by patients with epileptic vertigo, might be observed as a sign of inherited constitutional hyperreactivity of neurological function, which might be one of the causative elements to increase and prolong vestibular vertigo.
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