Disease Description (Causes and Symptoms)
- Definition: A condition in which breathing repeatedly stops or decreases during sleep, classified as obstructive, central, or mixed.
- Pathophysiology:
- Obstructive (most common): The airway collapses due to anatomical narrowing of the upper airway (nasal cavity, oral cavity, and pharynx) or relaxation of soft tissue, blocking breathing. Obesity, enlargement of the neck, tongue, or tonsillar tissue, and a small jaw may contribute.
- Central (rare): Respiratory effort itself is lost due to reduced signals from the respiratory center in the brain that controls breathing.
- Mixed: The two mechanisms coexist, such as when the condition begins as central sleep apnea and is followed by an obstructive component.
- Major symptoms: Loud snoring, apnea during sleep (reported by an observer), daytime sleepiness and fatigue, fragmented sleep and insomnia, morning headaches, reduced daytime concentration, sexual dysfunction (e.g., erectile dysfunction), reduced skin elasticity, etc.
- Possible complications: Increased cardiovascular and cerebrovascular risks due to nocturnal hypoxia (hypertension, arrhythmia, myocardial infarction, and stroke), metabolic abnormalities, increased risk of traffic accidents, and neuropsychiatric problems.
Treatment Methods
- Diagnosis-based approach: Select treatment after evaluating the apnea-hypopnea index (AHI), type of apnea, and severity through polysomnography.
- Non-surgical treatment (priority)
- Continuous positive airway pressure (CPAP): First-line standard treatment for obstructive and mixed sleep apnea. Intended to prevent airway obstruction.
- Variations of positive airway pressure: BiPAP (bilevel positive airway pressure) — provides pressure in stages and may be considered for patients with a high respiratory muscle burden or CPAP intolerance. Adaptive Servo-Ventilation (ASV) is used for some cases of central sleep apnea, but caution is needed in patients with heart failure (especially reduced EF).
- Oral appliances: Mandibular advancement devices and similar appliances, provided in collaboration with a dentist for patients with mild to moderate OSA or CPAP intolerance.
- Lifestyle modifications, including weight loss, avoiding alcohol and smoking, correcting sleep position (sleeping on one’s side is recommended), and avoiding sleeping pills and alcohol (which can worsen airway relaxation).
- Medication: Medications that correct apnea itself are limited. For residual daytime sleepiness, wakefulness-promoting agents (e.g., modafinil) may be used as an adjunct (specialist prescription and evaluation required).
- Surgical treatment (selected according to the anatomical site of obstruction)
- Uvulopalatopharyngoplasty (UPPP): Partial removal of the soft palate, uvula, and tonsils — effective in certain patients, but complete cure is not guaranteed; side effects such as bleeding, pain, and airway edema should be considered.
- Laser-assisted uvulopalatoplasty (LAUP): Reported to improve snoring, but its effect on improving apnea is limited.
- Nasal surgery (septoplasty and correction of nasal obstruction): Has an adjunctive role, such as improving CPAP suitability.
- Tonsillectomy and adenoidectomy: Effective in children with enlargement of the tonsils and adenoids, which are major causes.
- Maxillomandibular advancement and other mandibular advancement surgeries: Considered when anatomical factors are present.
- Considerations when selecting treatment: Type of apnea (obstructive vs. central), location of airway obstruction, overall health status, and patient preference and adherence.
Checklist Before an Outpatient Visit (Including Preparation, Items to Check, and Example Questions)
- Items to bring and record
- List of currently taken medications (including sleeping pills, antidepressants, and sedatives) and the times they are taken
- Previous diagnoses and test results (copies of cardiac or pulmonary disease records and polysomnography results, if available)
- Sleep pattern records (sleep onset and wake-up times, degree of daytime sleepiness, and changes in daytime fatigue and concentration) — record for 1–2 weeks if possible
- Observation records from a spouse or housemate (snoring frequency, times when apnea was witnessed, sounds during breathing, tossing and turning, etc.)
- Weight, height (or a recent BMI calculation), and neck circumference information
- Tests and evaluations that may be expected during the outpatient visit: Physical examination (the structure of the nasal cavity, oral cavity, pharynx, and neck), and polysomnography if necessary (in-hospital PSG or a home sleep test)
- Items the doctor may ask about during the outpatient visit (examples):
- "How often do you snore? Has anyone ever witnessed you stop breathing?"
- "Have you ever become sleepy or had difficulty concentrating while driving or working during the day?"
- "Do you have a habit of drinking alcohol or taking sleeping pills?"
Examples of General Questions to Ask the Doctor
- "According to my polysomnography (or symptoms), what are the type and severity of my apnea?"
- "What first-line treatment do you recommend, and what are its expected effects and disadvantages?"
- "How can I adjust to using CPAP and manage side effects (mask discomfort, nasal dryness, etc.)?"
- "If you determine that surgical treatment is necessary, what are the expected success rate and risks?"
- "What lifestyle changes should I make in particular? What would be an appropriate weight-loss goal?"
Examples of Disease-Specific Questions
- "It is unclear whether my apnea is obstructive or central. What additional tests or specialist consultations (e.g., cardiology or neurology) may be needed?"
- "If CPAP is recommended, which initial pressure setting (automatic vs. fixed) would be more suitable for me? Which type of mask (nasal, total nasal, or full-face) do you recommend?"
(Note: All treatment choices and medication use should be decided after consultation with the treating specialist, and additional evaluation is needed if there is a history of comorbidities such as cardiovascular disease or heart failure.)