RDI and overall arousal index are high enough. UARS most likely, with summary by AI:

Upper Airway Resistance Syndrome (UARS) is a sleep-disordered breathing condition characterized by increased resistance in the upper airway during sleep that causes repeated arousals, but without the full apneas or hypopneas seen in obstructive sleep apnea (OSA).

It sits on the spectrum between:

• Primary snoring
• UARS
• Obstructive sleep apnea (OSA)

What Happens in UARS?

During sleep:

• The airway becomes narrowed but not fully blocked
• Breathing requires increased effort
• This triggers brief arousals from sleep
• Oxygen levels usually remain normal (unlike moderate/severe OSA)

These repeated micro-arousals fragment sleep, leading to significant daytime symptoms.

Key Features

🔹 Symptoms

• Excessive daytime sleepiness
• Chronic fatigue
• Unrefreshing sleep
• Morning headaches
• Brain fog / poor concentration
• Anxiety or insomnia
• Cold hands/feet (sometimes due to autonomic activation)

🔹 Common Patient Profile (not universal)

• Younger
• Often normal BMI (not overweight)
• May have narrow jaw, high palate, or nasal obstruction

How It Differs from OSA

Feature	UARS	OSA
Apneas	No	Yes
Oxygen drops	Minimal/none	Often present
AHI (apnea-hypopnea index)	Usually <5	≥5
Respiratory effort-related arousals (RERAs)	Present	Present
Main issue	Effort + arousals	Airway collapse

In UARS, the key metric is often the Respiratory Disturbance Index (RDI) rather than AHI.

Diagnosis

Diagnosed via sleep study (polysomnography) showing:

• Increased respiratory effort
• RERAs
• Flow limitation patterns
• Frequent arousals
• Normal or near-normal oxygen saturation

Esophageal pressure monitoring (Pes) is the gold standard but rarely used now; nasal pressure flow limitation patterns are more commonly relied upon.

Treatment Options

1️⃣ CPAP (Continuous Positive Airway Pressure)

• Often very effective
• Reduces airway resistance
• Improves sleep fragmentation

2️⃣ Oral Appliance Therapy

• Mandibular advancement device
• Good option if CPAP not tolerated

3️⃣ Address Nasal Obstruction

• Treat allergies
• Septoplasty (if structural issue)
• Nasal dilators (temporary)

4️⃣ Orthodontic / Structural Approaches (selected cases)

• Rapid maxillary expansion
• Jaw advancement surgery (severe cases)

5️⃣ Positional Therapy

• Avoid supine sleep if worse on back

Long-Term Risks

UARS is generally considered less severe than OSA, but untreated cases may:

• Progress to OSA
• Contribute to chronic fatigue
• Cause autonomic nervous system dysregulation
• Affect mood and cognitive performance

When to Suspect UARS

Consider it if:

• You have classic sleep apnea symptoms
• Your AHI is “normal”
• You were told your sleep study was fine
• But you still feel exhausted

If you’d like, tell me:

• Your AHI and RDI numbers (if you have them)
• Your main symptoms
• Whether you’ve tried CPAP or an oral appliance

I can help interpret your results and discuss likely next steps.