Upper Airway Resistance Syndrome is a sleep-related breathing disorder characterised by increased resistance to airflow in the upper airway during sleep. Unlike sleep apnoea, UARS doesn’t cause complete airway obstruction or significant oxygen drops. Instead, the increased breathing effort required to overcome airway resistance leads to frequent micro-arousals throughout the night. These brief awakenings fragment sleep architecture, preventing the deep, restorative sleep stages necessary for physical and mental recovery. UARS may affect adults, though many cases remain undiagnosed due to its subtle presentation compared to obstructive sleep apnoea.
Upper Airway Resistance Syndrome (UARS) in Singapore
If you’re experiencing persistent daytime fatigue despite getting adequate sleep, frequent nighttime awakenings, or morning headaches, you may be dealing with Upper Airway Resistance Syndrome (UARS). This sleep disorder can affect individuals in Singapore, potentially impacting daily productivity and overall quality of life. UARS treatment in Singapore has evolved considerably, with ENT specialists now offering various approaches that may help patients achieve more restful sleep. Understanding this condition and available treatment options can be a step towards addressing your sleep concerns.
Dr Gan Eng Cern
MBBS
MRCS (Edin)
mmed (orl)
FAMS
What is Upper Airway Resistance Syndrome (UARS)?
Causes & Risk Factors
Causes
The primary cause of UARS is narrowing of the upper airway during sleep, which can result from various anatomical and physiological factors:
- Naturally narrow airway passages due to facial structure or jaw positioning
- Relaxation of throat muscles during sleep causing partial collapse
- Inflammation or swelling of airway tissues
- Enlarged tonsils or adenoids creating physical obstruction
- Deviated nasal septum restricting nasal airflow
- Chronic nasal congestion forcing mouth breathing
Risk Factors
Several factors may increase the likelihood of developing UARS:
- Younger age (may affect people in their twenties to forties)
- Female gender (women may be equally or more affected than men)
- Lower body weight (can occur in non-obese individuals)
- History of orthodontic treatment or tooth extractions
- Chronic allergies or rhinitis
- Family history of sleep-disordered breathing
- High stress levels and anxiety
- Certain sleeping positions, particularly on the back
Signs & Symptoms
Daytime Symptoms
- Excessive daytime sleepiness despite adequate sleep hours
- Chronic fatigue that doesn’t improve with rest
- Difficulty concentrating or brain fog
- Morning headaches or jaw pain
- Mood changes including irritability or depression
- Cold hands and feet due to autonomic dysfunction
Nighttime Symptoms
- Digestive issues including acid reflux
- Temporomandibular joint (TMJ) dysfunction
- Chronic pain syndromes
- Orthostatic intolerance or dizziness upon standing
- Anxiety or panic attacks
UARS symptoms may develop gradually and could be mistaken for other conditions like chronic fatigue syndrome or fibromyalgia. The key distinguishing feature is the sleep-related breathing pattern that can be identified through specialised sleep testing.
Severe Symptoms
- Extreme difficulty swallowing, including saliva
- High fever
- Severe neck swelling
- Difficulty breathing or opening the mouth fully
- Drooling in young children
- Signs of dehydration
- Persistent symptoms despite antibiotic treatment
Strep throat symptoms typically develop after exposure to the bacteria. The onset is usually sudden, with throat pain often being the first and most prominent symptom, distinguishing it from viral infections that develop more gradually.
Experiencing these symptoms?
Consult with an ENT specialist for an accurate diagnosis and appropriate treatment plan.
When to See an ENT Specialist
Consult an ENT specialist if you experience persistent daytime fatigue that doesn’t improve with adequate sleep, or if your partner notices irregular breathing patterns during sleep. Seek medical attention if you experience morning headaches, mood changes affecting daily life, or if fatigue impacts work performance or driving safety.
During your consultation, the ENT specialist will evaluate your sleep history, symptoms, and upper airway anatomy. This includes examining your nose, throat, and jaw structure, and discussing your sleep habits and daytime functioning. The specialist may recommend a sleep study to help confirm the diagnosis and distinguish UARS from other sleep disorders. Intervention can be important as untreated UARS may progress to obstructive sleep apnoea and contribute to cardiovascular problems.
Diagnosis & Testing Methods
Diagnosing UARS requires specialised testing that can detect subtle breathing disturbances not captured by standard sleep studies. Polysomnography with oesophageal pressure monitoring (Pes) is a recognised method for UARS diagnosis, which measures the breathing effort required to overcome airway resistance. This involves placing a thin pressure sensor through the nose into the oesophagus during an overnight sleep study.
Since Pes monitoring has limited availability in Singapore, alternative diagnostic approaches are often used. These include polysomnography with respiratory effort-related arousal (RERA) scoring, which identifies breathing events that may cause sleep fragmentation without oxygen desaturation. Home sleep tests may not detect UARS as they typically don’t measure sleep stages or subtle arousals.
Additional diagnostic tools include nasal endoscopy to evaluate the upper airway structure, acoustic rhinometry to measure nasal airway dimensions, and lateral cephalometric X-rays to assess jaw and airway anatomy. Some specialists may also use drug-induced sleep endoscopy (DISE) to visualise airway collapse patterns during sedation. Results are typically available within a timeframe that allows for treatment planning. Individual diagnostic approaches and timelines may vary based on clinical assessment.
Treatment Options Overview
Positive Airway Pressure Therapy
Continuous Positive Airway Pressure (CPAP) or Bilevel Positive Airway Pressure (BiPAP) devices deliver pressurised air through a mask to keep the airway open during sleep. For UARS patients, lower pressure settings may be sufficient compared to sleep apnoea treatment. Auto-titrating devices that adjust pressure based on breathing patterns can be effective. Treatment is ongoing, with patients typically using the device nightly. Individual results and timelines may vary.
Oral Appliance Therapy
Mandibular advancement devices (MADs) are custom-fitted dental appliances that position the lower jaw forward to enlarge the airway space. These devices may be effective for UARS patients with mild jaw retrognathia or those who cannot tolerate CPAP therapy. The appliances require periodic adjustment and may show improvement with consistent use. Regular follow-up with both the ENT specialist and dentist aims to ensure positioning and comfort.
Nasal Treatments
Addressing nasal obstruction can be important for UARS management. Medical treatments include intranasal corticosteroid sprays to reduce inflammation, antihistamines for allergic rhinitis, and saline irrigation to clear nasal passages. These medications may require consistent use to show effect. For structural issues, procedures like septoplasty to correct deviated septum or turbinate reduction to decrease nasal tissue bulk may be recommended.
Myofunctional Therapy
This therapy involves exercises to strengthen and retrain the muscles of the tongue, throat, and face. Patients work with trained therapists to improve tongue positioning, breathing patterns, and swallowing function. The therapy may require daily exercises with regular sessions. This approach aims to improve airway patency and sleep quality with consistent practice.
Surgical Interventions
When conservative treatments prove insufficient, surgical options may be considered. Uvulopalatopharyngoplasty (UPPP) removes excess tissue from the soft palate and throat. Genioglossus advancement moves the tongue attachment forward to help prevent airway collapse. Maxillomandibular advancement (MMA) surgically repositions both jaws forward for severe cases. Recovery varies by procedure type and individual factors.
Laser and Radiofrequency Procedures
Minimally invasive office-based procedures offer alternatives to traditional surgery. Laser-assisted uvulopalatoplasty (LAUP) uses laser energy to stiffen the soft palate. Radiofrequency ablation of the tongue base or soft palate reduces tissue volume. These procedures may require multiple sessions with gradual improvement over time.
Every patient’s condition is unique.
An ENT specialist can assess your specific situation and recommend the most suitable treatment.
Complications if Left Untreated
Untreated UARS may affect quality of life and could lead to health consequences. The chronic sleep fragmentation may prevent proper physical and mental restoration, potentially contributing to cognitive changes, including memory difficulties and decreased work performance. Some individuals may develop mood changes, particularly anxiety and depression, which could be related to fatigue and autonomic nervous system changes.
Over time, UARS may progress to obstructive sleep apnoea, particularly with age-related changes in muscle tone and weight changes. The chronic stress on the cardiovascular system from repeated arousals may contribute to blood pressure changes, heart rhythm irregularities, and cardiovascular concerns. Fatigue may also increase accident risk, particularly motor vehicle accidents due to drowsy driving. Additionally, sleep quality changes may affect immune system function, potentially making individuals more susceptible to infections and affecting healing processes. Individual experiences and outcomes may vary. This information is provided for educational purposes and should not replace professional medical consultation.
Prevention
Whilst not all cases of UARS are preventable due to anatomical factors, several strategies may help reduce risk and prevent progression. Maintaining nasal health through regular saline rinses and prompt treatment of allergies can help support clear nasal breathing. Managing allergic rhinitis with appropriate medications may help prevent chronic nasal inflammation that contributes to airway resistance.
Weight management, even within normal ranges, may help prevent increases in neck circumference that could narrow the airway. Avoiding alcohol and sedatives before bedtime may help prevent excessive muscle relaxation that could worsen airway collapse. Sleeping position modification, particularly avoiding back sleeping, may help reduce airway resistance in some individuals.
Stress management through relaxation techniques, regular exercise, and adequate sleep hygiene may help support the autonomic nervous system. Regular dental care and orthodontic evaluation can help identify and address jaw positioning issues early. For those with known risk factors, periodic screening with an ENT specialist can help detect early signs before symptoms become severe. Individual results and approaches may vary. Consult with a healthcare professional for personalised advice.
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Frequently Asked Questions (FAQ)
How is UARS different from sleep apnea?
UARS involves increased breathing effort without complete airway obstruction or significant oxygen drops, unlike sleep apnea where breathing stops completely. UARS causes subtle sleep disruption through increased respiratory effort, leading to frequent micro-arousals. UARS symptoms focus more on fatigue and autonomic dysfunction rather than the loud snoring and witnessed breathing pauses common in sleep apnea.
Can UARS be managed permanently?
Treatment outcomes depend on the underlying cause of airway resistance. Some patients may achieve long-term improvement through surgical correction of anatomical abnormalities or myofunctional therapy. Others manage the condition with ongoing treatments like CPAP or oral appliances. Early intervention and comprehensive treatment addressing contributing factors may support favourable outcomes. Regular monitoring helps adjust treatment as needed.
What type of sleep study detects UARS?
In-laboratory polysomnography with RERA scoring or oesophageal pressure monitoring can provide UARS diagnosis. Standard home sleep tests often miss UARS as they don’t measure sleep stages or subtle breathing disturbances. The sleep study must include EEG monitoring to detect micro-arousals and respiratory monitoring to identify increased breathing effort. Some centres in Singapore offer these sleep studies designed to detect UARS.
Is CPAP the only treatment option for UARS?
CPAP is one treatment option among several approaches for managing UARS. Oral appliances may be suitable for appropriate candidates, particularly those with mild to moderate symptoms. Combination approaches using nasal treatments, positional therapy, and myofunctional exercises may be considered for some patients. Surgical options can address specific anatomical causes. The ENT specialist will recommend treatments based on your specific anatomy, symptom severity, and personal preferences.
How long does it take to see improvement with treatment?
Treatment response varies depending on the chosen approach. CPAP therapy may provide symptom relief within days to weeks of consistent use. Oral appliances may show improvement within several weeks. Myofunctional therapy may require months of consistent practice before changes occur. Surgical interventions may take weeks for recovery and symptom resolution. Individual results and timelines may vary. This treatment is administered as part of a comprehensive plan supervised by a healthcare professional.
Can children develop UARS?
Children can develop UARS, often related to enlarged tonsils and adenoids, allergic rhinitis, or craniofacial abnormalities. Paediatric UARS may present as behavioural problems, poor school performance, or ADHD-like symptoms rather than classic fatigue. Early recognition and treatment in children can be important as it may affect growth, cognitive development, and facial structure. Paediatric ENT evaluation is recommended for children with sleep-disordered breathing symptoms.
Conclusion
Upper Airway Resistance Syndrome represents a treatable cause of chronic fatigue and sleep disruption. Understanding that persistent exhaustion may stem from this breathing disorder can be an important step in seeking appropriate care. With proper diagnosis using sleep studies and comprehensive evaluation by an ENT specialist, treatment options can aim to improve sleep quality and daytime energy. The range of available treatments, from non-invasive therapies to surgical interventions, means that patients may have multiple options to consider.
Take the First Step Towards Better Health
Living with Upper Airway Resistance Syndrome can be challenging. Our ENT specialist has experience diagnosing and treating UARS using evidence-based approaches.
Dr Gan Eng Cern
MBBS
MRCS (Edin)
mmed (orl)
FAMS
With over 15 years of experience, Dr Gan specialises in the comprehensive management of a broad range of conditions related to the ear, nose and throat (ENT), and head and neck.
Dr. Gan has contributed to the academic field as a Senior Clinical Lecturer at the Yong Loo Lin School of Medicine, National University of Singapore. He underwent his subspecialty training in Rhinology (Nose & Sinus conditions) and Endoscopic Skull Base Surgery at the renowned St Paul’s Sinus Center, part of the University of British Columbia in Vancouver, Canada. He is recognised for his extensive research work, with numerous contributions to reputable international ENT journals. Dr Gan is also highly sought after as a speaker and has shared his surgical knowledge as a surgical dissection teacher at various prominent ENT conferences and courses.
- 2020 – Reader’s Choice Gold Award for Best ENT Specialist (Expat Living Singapore)
- 2016 – Best Educator Award (Eastern Health Alliance)
- 2016 – “Wow” Award (Patient Compliment)
- 2014 – Eastern Health Alliance Caring Award – Silver
- 2014 – 19th Yahya Cohen Memorial Lectureship (awarded by the College of Surgeons, Academy of Medicine Singapore for best scientific surgical paper)
- 2012 – Human Manpower Development Award (Ministry of Health, Singapore)
- 2007 – Singhealth Best Doctor Award
Qualifications
- MBBS – Bachelor of Science, Bachelor of Medicine, Bachelor of Surgery (University of New South Wales, Sydney, Australia)
- MRCS (Edin) – Member of the Royal College of Surgeons Edinburgh, United Kingdom
- MMed (ORL) – Master of Medicine in ENT (National University of Singapore)
- FAMS – Fellow of the Academy of Medicine Singapore
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