Otoneurologic & audiologic findings in fibromyalgia (FM)

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Patients with fibromyalgia were studied with otoneurological
and audiological tests. Altogether 168 patients (141 women)
participated. Vertigo/dizziness was reported by 72% of the
patients. Sensorineural hearing loss was found in 15% of the
cases. Auditory brainstem responses (ABR) and oculomotor tests
were applied, and statistical comparisons between patients and
controls were performed. Significant differences were found
for the absolute latency of wave V and for the I-V and III-V
interpeak latencies, indicating brainstem dysfunction.

Abnormal ABR recordings were found in 30% of the cases. In the
oculomotor study the mean velocity gain for the smooth
pursuits and the mean saccadic latency were significantly
different between patients and controls. Abnormal saccades
were seen in 28% and pathological smooth pursuit eye movements
in 58% of the patients. Electronystagmography was pathological
in 45% of the cases. The findings indicate that CNS
dysfunction frequently occurs in patients with fibromyalgia,
although proprioceptive disturbances might also explain some
of the abnormalities observed.

Rosenhall U, Johansson G, Orndahl G

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