Evaluation of occipitocervical subluxation in rheumatoid arthritis patients, using coronal-view reconstructive computed tomography.

Study Design: Reconstructive computed tomography (CT) study of occipito-atlanto and atlantoaxial joints in RA patients.

Summary Of Background Data: The occipitocervical region is one of the most common sites of rheumatoid arthritis (RA). Although lateral radiography has been used for the diagnosis of atlantoaxial subluxation and vertical subluxation, reconstructive CT imaging of the occipito-atlanto and atlantoaxial joints is more sensitive in detecting morphologic changes in this region.

Contribution of endolymphatic fluid shift to caloric response in plugged semicircular canals.

The purpose of this study was to clarify the role of endolymphatic fluid shift in caloric response, using frog posterior semicircular canals (PSCs). PSCs were sutured using 10-0 nylon thread and were used as a model of canal plugging. Compound action potentials (CAPs) of the PSC nerve evoked by a cooling stimulus were recorded.

Model experiments of BPPV using isolated utricle and posterior semicircular canal.

Objectives: This study was aimed to experimentally investigate the effect of returned otoconia on the utricular using isolated utricles. The effect of interposed otoconia in models of canalolithiasis and cupulolithiasis were also investigated using isolated posterior semicircular canal (PSC).

Methods: Bullfrogs were used.