Radiography used to identify teens with sleep apnea

Fifteen percent of all teenagers in the United States undergo orthodontic treatment. Craniofacial Risk Index (CRI)
scores, calculated from the radiographs routinely obtained on all orthodontic patients, correctly classified 80% of apneic
and 78% of non-apneic adult snorers into high- and low-Respiratory Disturbance Index (RDI) groups. (Sleep apnea is a
temporary suspension of breathing during sleep, with potentially serious consequences.) Researchers at Case Western Reserve
University (Cleveland, OH) wondered whether similar radiographic use could identify adolescent orthodontic patients with high
RDI scores.


The investigators studied the case histories of 590 patients between 7 and 18 years of age attending the orthodontic clinic
at Case Dental School. They recorded age, gender, height and weight (abstracted from patient chart) along with tongue length
and hyoid-to-mandibular-plane distance (measured from lateral cephalograms) in a linear model to generate a CRI score. The 30
patients with the highest and 30 patients with the lowest CRI scores were asked to undergo unattended in-home sleep
monitoring to determine their RDI score.


Since children in this small pilot sample with high CRI scores exhibited somewhat higher RDI scores than those with low CRI
scores, it may be possible to use cephalometric radiographs to identify teenagers at risk for sleep-disordered breathing.



This is a summary of abstract #2531, by M.G. Hans and co-workers, from Case Western Reserve University, Cleveland, OH, to be
presented at 2 p.m. on Friday, March 11, in Exhibit Hall E-F of the Baltimore Convention Center, during the 83rd General
Session of the International Association for Dental Research.


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