Assessment of the otolith-autonomic response using spectral analysis of the R-R interval and blood pressure

Citation
K. Yamamoto et al., Assessment of the otolith-autonomic response using spectral analysis of the R-R interval and blood pressure, OTO H N SUR, 123(5), 2000, pp. 582-586
Citations number
20
Categorie Soggetti
Otolaryngology
Journal title
OTOLARYNGOLOGY-HEAD AND NECK SURGERY
ISSN journal
01945998 → ACNP
Volume
123
Issue
5
Year of publication
2000
Pages
582 - 586
Database
ISI
SICI code
0194-5998(200011)123:5<582:AOTORU>2.0.ZU;2-L
Abstract
The effects of otolith stimulation on systolic blood pressure (SBP) and R-R interval fluctuations were investigated in 12 healthy subjects and 5 patie nts with loss of labyrinthine function. The vestibular otolith organs were stimulated by centrifugal forces, the constant rotation of a chair fixed ou tside of the rotation axis on the horizontal plane. The chair was fixed alo ng the direction of centrifugal force (eccentric rotation (ECR)) or along t he tangent line (eccentric lateral rotation (ECLR)). The ECR stimulates bot h the utricular and saccular maculae, whereas the ECLR stimulates only the utricular maculae, Spectral analysis showed that in the healthy subjects, l ow-frequency SBP increased significantly during ECR but not during ECLR. Th ere was no significant increase in low-frequency SBP in patients with labyr inthine loss. In the R-R interval analysis, however, the low- and high-freq uency components did not change significantly in the healthy subjects durin g ECR, Our findings indicate that stimulation of the otolith maculae, espec ially the saccular organs, predominantly produces augmentation of the a-sym pathetic activities rather than cardiac sympathovagal outflow to the heart.