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Cervical Angles in Sleep Apnea Patients: A Retrospective Study
Graham J. Dobson, D.C.BIO ,
Robert H. I. Blanks, Ph.D.BIO ,
W.R. Boone, Ph.D., D.C.BIO ,
and Harold G. McCoy, D.C.BIO
ABSTRACT
Abstract — The present study was undertaken to evaluate, retrospectively,
radiographs from diagnosed Obstructive Sleep Apnea Syndrome (OSAS) patients.
Four angles were assessed from the lateral radiographs: (1) atlas/axis, (2)
atlas, (3) atlas/occiput, and (4) occiput, which, like the atlas angle, was
determined relative to the horizontal plane of the x-ray film. The severity
of OSAS was determined by two indices. The first, the standard
"Respiratory Disturbance Index" (RDI), indicates the number of
apneas and hypopneas per hour of sleep. The second index of OSAS severity,
the combined "Sleep Baseline Score" (SBS), was derived from
multivariate analysis of a wide variety of sleep parameters. These
data were studied through bivariate and multiple regression analyses
relative to the level of OSAS severity, sex, and age. Findings suggested
that a general kyphotic configuration of the occiput and upper cervical
spine existed among the overwhelming majority of OSAS patients. Moreover,
data revealed that the greatest extent of flexion was apparent in the most
severe OSAS patients, followed by the least severe, and then by the female
OSAS patients. Sex differences relevant to the occiput and other upper
cervical angles were interpreted cautiously due to the low number of females
in the present study, which is characteristic of OSAS patients in general.
From the present findings, it is apparent that OSAS patients can be expected
to exhibit an upper cervical kyphotic spine. The impact of these findings,
and ramifications of OSAS as a somatovisceral model evaluating the effects
of chiropractic care are discussed.
Key Words: Sleep apnea, respiratory disturbance index, atlas angle,
atlas-axis angle, atlas-occiput angle, sleep baseline score, vertebral
subluxation.
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