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Soft Cervical Collars and Apnea

Introduction

This article provides guidance for the selection and use of a soft cervical collar (SCC) to prevent a common cause of positional apnea. Many CPAP users(at least 1/3 of forum members including the writer) experience significant clustered flow restrictions, hypopnea, and obstructive apnea that do not respond to pressure due to misalignment and restriction of the airway caused by tucking the chin down toward the chest (neck flexion). With chin tucking the soft tissues under the jaw are pressed upward causing a restriction or collapse during inspiration. It takes very little pressure to make this happen and the negative pressure of the airway during inspiration increases the restriction. This has been confirmed in at least one medical study ^[1]. To demonstrate this, sit relaxed in a chair and take a couple of deep breaths. Then let your chin drop to your chest, take more deep breaths, and note the increased resistance. This is a common, perhaps the most common, form of what we call positional apnea and, as previously mentioned, usually cannot be resolved by increased pressure.
Flow restrictions caused by chin tucking can be eliminated by wearing a loose fitting soft cervical collar (SCC), or an alternative to be discussed below, to restrict neck flexion. Here are images of a typical SCC.

It consists of foam rubber with a cloth cover and a Velcro closure at the rear. The Velcro closure allows several inches of adjustment to achieve the correct fit. They are available in a variety of lengths and heights to suit individual needs. (The length and height in the example above would not be appropriate for everyone.)
Anti-snore pillows (collars) that are similar to an SCC in the front but have just a strap around the back are an effective alternative for those who find a foam collar that completely surrounds the neck too warm or otherwise uncomfortable. They are much less available locally, however, and are usually more expensive.

A small pillow set under the chin will also prevent tucking but is less effective than a collar and will probably not stay in place.
Please see [Optimizing_therapy Wiki] for additional information on what is often referred to as "positional apnea".

Where and How to Find Them

In the United States, an SCC can be purchased at most pharmacies and big box stores for around $20 but the selection of sizes will be limited. The best selection of sizes and prices (as low as $10) will be found at internet vendors such as Amazon and eBay.

A large number of choices of SCC can be found by entering “soft cervical collar” or “soft foam collar” in a search engine. A similar search at the site of vendor such as Amazon or eBay will also bring up many choices with fewer extraneous hits.

Anti-snore collars may be available at some big box stores but the best source is internet vendors It is difficult to find a good selection by entering “anti snore collar” in a search engine or even at the site of an internet vendor. It is more successful to search for specific brands/models such as Dr. Dakota Anti Snore Pillow Cushion, or Eliminator Series Sleep Aid Cushion. The Caldera Releaf Neck Rest, which more closely resembles an SCC has also been recommended by some forum members.

Fit and Use

Proper fit is very important. The SCC needs to support the jaw and chin, without impinging on the throat or soft tissue between the chin and throat or immobilizing neck movement more than is required to prevent the chin from tucking to the chest. Both height and circumference (length) are important. With respect to circumference, too tight a fit will be uncomfortable and may have adverse consequences and too loose a fit will not prevent chin tucking.

The length of the collar should be a couple of inches more than your neck size as determined using a cloth measuring tape. The SCC package should give the length or the range in neck sizes for which the collar is designed. Keep in mind that the size stated is for the intended use of the collar which is a tight fit to immobilize the neck of someone who has had an injury. For our purpose the collar must be a looser fit. Therefore, a collar longer than the measured neck circumference should be selected. Many sold by internet vendors such as Amazon are described just as small, medium, and large. Often there will be a sizing chart stating the range of neck sizes for each category. Select the size for which your neck size falls near the middle of the range. Precision is not important because most have a Velcro strap at the back and can be adjusted an inch or two beyond the stated range.

With respect to height, a collar that is too short may permit enough chin tucking to compromise the airway whereas one that is too tall will extend the neck up and back which will be uncomfortable. Collars are available in heights ranging from 50 to 75mm (2” to 5”). Choose a collar with a height close to the distance from the bottom of the chin to where the point where the neck meets the chest.

Internet vendors offer the best selection of heights. 3M markets an SCC called the Futuro that has a height adjustment tab. We have no reports on how well it works but 3M products are usually of good quality. It is available at most chain pharmacies such as CVS and Walgreens.

Adjust the collar so it is just tight enough to prevent the chin from tucking behind it, but no tighter , so that it feels loose and can easily be moved around on the neck. It should be possible to easily insert one or two fingers between the neck and collar. It is important that the fit not only be loose but that the collar only be worn while sleeping. Constant prolonged use of a cervical collar, especially if tight, can result in damage to nerves and tendons and muscle atrophy.

We feel comfortable recommending the use of the SCC as described above because it is not worn tight as it would be for its intended use, to stabilize the neck following injury, and is only worn while sleeping and not constantly. Evidence that there are no adverse side effects from long term use of a loose fitting SCC worn only while sleeping is, however, anecdotal from the experience of forum members. We have no solid data with respect to safety.

Most of the data demonstrating the successful use of SCC for treating "positional apnea" is 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] 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] . In another study a significant reduction in AHI was seen in patients with severe OSA with combined cervical collar and MAD therapy as compared to MAD therapy alone. ^[4] 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]

OSCAR Charts

Without Collar


With Collar

Additional Info

Optimizing_therapy#Positional_Apnea

DISCLAIMER & LEGAL NOTICE

BY USING A SOFT CERVICAL COLLAR OR OTHER MEANS TO PREVENT CHIN TUCKING AS DESCRIBED IN THIS DOCUMENT, YOU UNDERSTAND THAT YOU ARE PERSONALLY ASSUMING ALL ASSOCIATED RISK AND WILL NOT HOLD APNEA BOARD, ITS MEMBERS, OWNERS, ADMINISTRATORS AND/OR MODERATORS LIABLE FOR ANY PROBLEMS, DAMAGES, PHYSICAL HARM, (INCLUDING DEATH), MENTAL HARM OR ANY OTHER HARM THAT MAY COME TO YOU, YOUR FAMILY MEMBERS, FRIENDS, CO-WORKERS OR ANY OTHER PERSONS WHO MAY RECEIVE THIS INFORMATION FROM YOU. YOU MAY NOT USE, COPY OR DOWNLOAD THIS DOCUMENT UNLESS YOU HAVE A LEGAL RIGHT TO DO SO UNDER ALL APPLICABLE U.S. LAWS. INFORMATION CONTAINED ON THIS WEB PAGE, APNEA BOARD FORUMS AND ON THE APNEABOARD.COM WEB SITE SHOULD NOT BE CONSIDERED AS MEDICAL ADVICE. ALWAYS SEEK THE ADVICE OF A QUALIFIED PHYSICIAN BEFORE SEEKING TREATMENT FOR ANY MEDICAL CONDITION, INCLUDING SLEEP APNEA.

References

1. ↑ Effect of Jaw and Head Position on Airway Resistance in Obstructive Sleep Apnea Choi JK, et al., Sleep and Breathing, 2000;4(4):163-168. https://www.ncbi.nlm.nih.gov/pubmed/11894202
2. ↑ Evaluation of Treatment Effect of Cervical Collar in Moderate Obstructive Sleep Apnea, Florim Delijaj, Uppsala University. https://clinicaltrials.gov/ct2/show/NCT03754270
3. ↑ 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/
4. ↑ 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, 5:5 https://www.longdom.org/open-access/redu...000252.pdf
5. ↑ Soft Cervical Collar in Obstructive Sleep Apnea, a Pilot Study, P Bordier, et al., Sleep, Volume 41, Issue suppl_1, April 2018 https://academic.oup.com/sleep/article/4...08/4988596

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