Abstract

Objective: Patients with benign paroxysmal positional vertigo (BPPV) visit clinics with typical position evoked vertigo. However, typical nystagmus are concealed according to many factors We evaluated the demographic, clinical and nystagmographic features of patients, who visited clinics with typical BPPV symptoms but did not have positional test evoked nystagmus.
Methods
Among 306 patients with history of positional vertigo, we excluded 252 patients who had positional test evoked nystagmus on video Frenzel glass in clinics, and analyzed 54 patients who did not have positional test evoked nystagmus. We divided 54 patients into two groups; patients without subjective vertigo in positional test and patients with subjective vertigo in positional test. We analyzed the serial nystagmographic findings, causes, duration of disease, previous history of medical or rehabilitation treatments, coexisting vestbular disorders, recovery time and recurrence.
Results
Etiology, history of previous treatment, coexisting vestibular disorders and recurrence did not differ statistically in both groups. However, the nystagmographic features were significantly different in both groups.
Conclusion
When patient has positional test evoked vertigo, repeated positional maneuver seemed to increase the expression of positional nystagmus.

• Keywords: Benign paroxysmal positional vertigo;Vertigo;Nystagmus;