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strictly anecdotal. Although most doctors, sleep centers, and therapists are not aware of this
application, it has not escaped the attention of sleep medicine researchers. We are aware of one
pending study 2 <ref> Evaluation of Treatment Effect of Cervical Collar in Moderate Obstructive Sleep Apnea, Florim Delijaj, Uppsala University. https://clinicaltrials.gov/ct2/show/NCT03754270 </ref> and three that have been completed. In one completed study five subjects with
severe obstructive sleep apnea (OSA) that was not resolved with CPAP alone (mean AHI 21.2
with CAP) had a reduction in mean AHI to 0.8 with combined CPAP and cervical collar
treatment 3 <ref>Efficacy of the Addition of a Cervical Collar in the Treatment of Persistent Obstructive Apneas Despite Continuous Positive Airway Pressure, Arnaud Prigent, et al., 2017 Dec 15; 13(12): 1473–1476.https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5695995/</ref> . In another a significant reduction in AHI was seen in patients with severe OSA withcombined cervical collar and MAD therapy as compared to MAD therapy alone. 4 <ref>Reduced Apnea-Hypopnea Index in Patients with Severe Sleep Apnea Syndrome as Determined by Cervical Collar and Mandibular Advancement Device Combination Therapy, Delijaj et al., Journal of Sleep Disorders & Therapy, 2016, 5:5https://www.longdom.org/open-access/redu...000252.pdf</ref> In a third study
only one of 20 subjects with severe OSA experienced a significant (67%) decrease in AHI
associated with use of the collar. The authors concluded “a soft cervical collar had no effect on
pharyngeal patency in patients with OSA”. 5 <ref>Soft Cervical Collar in Obstructive Sleep Apnea, a Pilot Study, P Bordier, et al., Sleep, Volume 41, Issue suppl_1, April 2018https://academic.oup.com/sleep/article/4...08/4988596</ref> <br>
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