Harmonic versus impulsive acceleration testing of the vestibulo-ocular reflex in normal humans.

Vestibulo-ocular reflex (VOR) was tested in 9 normal humans by using both harmonic (sinusoidal) and impulsive (post-rotatory) angular accelerations. VOR gain and main time constant were 0.49 +/- 0.20 and 15.48 +/- 2.26 s, respectively, when computed from sinusoidal responses, 0.45 +/- 0.17 and 14.28 +/- 3.07 s when computed from impulse responses. Paired comparison could not prove statistically significant differences between the two sets of data. The conclusion is drawn that, in normals, equivalent information about VOR static and dynamic characteristics can be derived from either harmonic acceleration or post-rotatory tests

Nasal paraganglioma. A case report

Nonchromaffin paragangliomas or chemodectomas arise in paraganglia distributed in various parts of the body. The jugular bulb, the vagal body and the bifurcation of the carotid artery are the most common sites of origin of paraganglioma in the head and neck region. Paragangliomas in the nose and paranasal sinuses are extremely rare and very few cases of definite paraganglioma arising primarily in the nose or paranasal sinuses have been reported. The paraganglioma is a slow-growing tumour that produces nasal obstruction, profuse epistaxis and facial swelling. Complete excision of the glomus tumour is normally curative. We report a case of nasal paraganglioma and discuss the diagnosis and therapy

Harmonic versus impulsive acceleration testing of the vestibulo-ocular reflex in normal humans.

Vestibulo-ocular reflex (VOR) was tested in 9 normals by using both harmonic and impulsive (post-rotary) angular accelerations. From both responses VOR gain and phase shift were computed by considering nystagmus slow-phase velocity. Paired comparison couldn't prove statistically significant differences between the two sets of data. It is concluded that, in normals, equivalent information about VOR static and dynamic properties can be obtained from either harmonic acceleration or post-rotary test