If it's not sleep apnea, what is it?

Sometimes people have a problem with breathing during sleep that is not diagnosed as obstructive sleep apnea (OSA) after they've had a sleep study.

Upper airway resistance syndrome (UARS) is a form of obstructive breathing during sleep which only yields a partial blockage of the airway and does not result in low oxygen levels in the bloodstream.

What is upper airway resistance? 

It can include snoring, but the syndrome that defines UARS doesn't necessarily lead to snoring. With upper airway resistance, the airway narrows so much that the muscles of breathing along the ribcage and the diaphragm work double duty to ensure a complete inhale. Imagine breathing through a straw and you can see how it might be harder to breathe.

These conditions create what the Ohio Sleep Medicine Institute refers to as "snore arousals." Technically speaking, these are respiratory event related arousals (RERAs): arousals caused by resistance in the airway which do not result in oxygen desaturation. They are accounted for during sleep studies along with apneas and hypopneas in what is known as the Respiratory Distress Index (RDI). 

While there's no fear of oxygen-deprived blood due to RERAs, those who have them frequently still struggle to achieve deep sleep. They tend to suffer from sleep fragmentation, which is, in its own way, dangerous. Night after night of broken sleep can lead to the same side effects as insomnia and sleep apnea, such as mood swings, excessive daytime sleepiness, high blood pressure, and drowsy driving. 

What causes UARS? 

Like OSA, UARS is caused by faulty mechanics, such as blockages in the airway due to:

How else is UARS distinguished from sleep apnea? 

Here are some other factors that doctors consider during diagnosis: 

What happens when UARS is left untreated


The discovery of UARS as a sleep breathing disorder happened at Stanford nearly 25 years ago, and yet diagnosing and treating it is still inconsistent, at best.

Patients observed for the obvious signs of sleep apnea showed none, yet they were still tired all the time and suffered physically and mentally.

Doctors, lacking any conclusive evidence of a sleep disorder that insurance would be willing to reinburse treatment for, often overlooked the diagnosis or, because they were looking for sleep apnea, did not diagnose anything in its place when data showed differently.

The Ohio Sleep Medicine Institute refers to UARS as "the orphan child of sleep medicine" because its diagnosis escapes some doctors, who don't always agree on how to define it, or don't always offer treatment when it can be confirmed. 

To make matters worse, UARS is also often misdiagnosed as chronic fatigue syndrome (CFS), fibromyalgia, depression, mood disorder, or migraine by primary care physicians who do not consider the value of having their patients undergo a sleep study to rule out a sleep-breathing disorder. Other impacts from untreated UARS include:

There's also controversy as to whether UARS is a sleep disorder that's distinct from OSA. Some doctors argue that it is, while others believe that, if left untreated, it can gradually progress, in its "harmless" position in the hierarchy of sleep breathing disorders, from "benign snoring," to UARS to, ultimately, sleep apnea. 

Meanwhile, about 1 in 7 patients having sleep tests to reveal sleep breathing problems are still shown to have UARS and still need help breathing at night. 


Treating UARS

Fortunately, things have changed since the early 1990s; the American Academy of Sleep Medicine (AASM) identified it as a sleep breathing disorder and included practice parameters for treating it in 2005.

Insurance is starting to recognize UARS and provide for its therapies as well, which include use of continuous positive airway pressure (CPAP), an oral appliance, weight loss, positional therapy, and some surgical approaches. 

At Sound Sleep Health, we look at the full range of possibilities when it comes to sleep breathing disorders. Contact us today to get a free sleep assessment to determine if you might potentially suffer from UARS: 



American Academy of Sleep Medicine
Cleveland Clinic
Current Opinion in Pulmonary Medicine
Journal of Clinical Sleep Medicine
Ohio Sleep Medicine Institute
Sleep Science
Stanford Center for Sleep Sciences and Medicine 

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