Sleep Apnoea

What is Sleep Apnoea?

Sleep apnoea is a serious sleep disorder characterized by repeated interruptions in breathing during sleep, where the airway becomes partially or completely blocked. These breathing pauses, called apneas, can last from 10 seconds to over a minute and may occur hundreds of times per night. The condition affects approximately 936 million adults worldwide, with obstructive sleep apnoea (OSA) being the most common form. Sleep apnoea significantly impacts quality of life and increases the risk of cardiovascular disease, stroke, and other serious health complications if left untreated.

Key statistics

Symptoms

Common symptoms include: loud snoring, witnessed breathing pauses, gasping or choking during sleep, excessive daytime sleepiness, morning headaches, difficulty concentrating, mood changes, and frequent nighttime urination.

Nighttime symptoms: The most recognizable sign is loud, chronic snoring that may be interrupted by periods of silence followed by gasping or choking sounds. Partners often witness breathing pauses that can be alarming. Restless sleep, frequent awakenings, and night sweats are also common.

Daytime symptoms: Excessive daytime sleepiness is a hallmark symptom, often leading to difficulty staying awake during meetings, while driving, or during other activities. Morning headaches occur due to oxygen deprivation during sleep. Cognitive symptoms include difficulty concentrating, memory problems, and reduced alertness.

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Serious warning signs: Falling asleep while driving, severe fatigue that interferes with daily activities, witnessed breathing cessation lasting more than 10 seconds, and episodes of gasping that wake the person from sleep require immediate medical attention.

Causes and risk factors

Primary causes: Sleep apnoea occurs when throat muscles relax excessively during sleep, causing airway collapse (obstructive sleep apnoea), or when the brain fails to send proper signals to breathing muscles (central sleep apnoea). Mixed sleep apnoea combines both mechanisms.

Risk factors include:
– Obesity (BMI >30), particularly excess weight around the neck
– Age over 40 years
– Male gender (2-3 times higher risk)
– Family history of sleep apnoea
– Anatomical factors: large tongue, small jaw, enlarged tonsils or adenoids
– Nasal congestion or structural abnormalities
– Smoking and alcohol consumption
– Use of sedatives or muscle relaxants
– Medical conditions: heart failure, high blood pressure, diabetes, stroke history

Genetic factors: While not directly inherited, family clustering suggests genetic predisposition to anatomical features that increase risk, such as facial structure and body fat distribution patterns.

Prevention

Evidence-based prevention strategies focus on modifiable risk factors. Maintaining a healthy weight is the most effective preventive measure, as even modest weight loss can significantly reduce sleep apnoea severity. Avoiding alcohol and sedatives, especially before bedtime, prevents excessive muscle relaxation that worsens airway collapse.

Sleeping position modifications, particularly avoiding supine sleep, can reduce episodes in position-dependent cases. Regular exercise improves muscle tone and aids weight management. Smoking cessation reduces airway inflammation and fluid retention.

Treating underlying conditions such as nasal congestion, allergies, or chronic sinus problems helps maintain open airways. Good sleep hygiene, including consistent sleep schedules and adequate sleep duration, supports overall respiratory health during sleep.

Complications

Untreated sleep apnoea leads to serious cardiovascular complications due to repeated oxygen deprivation and stress responses. High blood pressure develops in 50% of patients, while the risk of heart attack increases by 30%. Stroke risk doubles, and irregular heart rhythms (atrial fibrillation) are common.

Metabolic complications include insulin resistance and type 2 diabetes, occurring in up to 40% of patients. The condition also impairs immune function, increases inflammation, and accelerates aging processes.

Cognitive and psychiatric effects include depression (affecting 20% of patients), anxiety, memory problems, and increased accident risk. Motor vehicle accidents are 2-3 times more likely due to daytime sleepiness. Social relationships often suffer due to disruptive snoring and mood changes.

Diagnosis

Diagnosis begins with clinical assessment using validated questionnaires such as the Epworth Sleepiness Scale and STOP-BANG questionnaire. Physical examination focuses on airway anatomy, including throat, neck circumference, and nasal passages.

Polysomnography (overnight sleep study) remains the gold standard diagnostic test, monitoring brain waves, eye movements, muscle activity, heart rhythm, breathing effort, oxygen levels, and airflow throughout the night.

Home sleep apnea testing (HSAT) offers a convenient alternative for patients with high pretest probability, measuring airflow, breathing effort, and oxygen saturation in the home environment.

Multiple Sleep Latency Test (MSLT) may be performed to assess daytime sleepiness objectively. Additional tests might include overnight oximetry to monitor oxygen levels and upper airway imaging to identify anatomical abnormalities.

The severity is classified based on the Apnea-Hypopnea Index (AHI): mild (5-14 events/hour), moderate (15-29 events/hour), and severe (≥30 events/hour).

Treatment

Continuous Positive Airway Pressure (CPAP) therapy remains the first-line treatment, delivering pressurized air through a mask to keep airways open during sleep. Auto-CPAP devices automatically adjust pressure based on breathing patterns.

Oral appliances provide alternative treatment for mild to moderate cases, repositioning the jaw and tongue to maintain airway patency. Custom-fitted devices show better efficacy than over-the-counter options.

Surgical interventions include uvulopalatopharyngoplasty (UPPPP) to remove excess throat tissue, genioglossus advancement to reposition tongue muscles, and maxillomandibular advancement for severe anatomical cases. Hypoglossal nerve stimulation represents a newer surgical option.

Positional therapy helps patients with position-dependent sleep apnoea avoid supine sleeping. Weight loss programs can significantly improve or resolve sleep apnoea in obese patients.

Medications play limited roles, though modafinil or armodafinil may help manage residual sleepiness despite treatment. Acetazolamide shows promise for central sleep apnoea.

Prognosis

With appropriate treatment, sleep apnoea has an excellent prognosis. CPAP therapy reduces cardiovascular risks by 30-50% and dramatically improves quality of life. Daytime sleepiness typically resolves within weeks of starting effective treatment.

Untreated severe sleep apnoea reduces life expectancy by 12-15 years due to cardiovascular complications. However, consistent treatment adherence (using CPAP >4 hours nightly) normalizes mortality risk to that of the general population.

Long-term outcomes depend on treatment compliance, weight management, and addressing underlying risk factors. Patients who maintain healthy lifestyles alongside treatment often experience sustained improvement and may reduce treatment intensity over time.

Quality of life

Living with sleep apnoea requires commitment to treatment and lifestyle modifications. CPAP users should establish consistent bedtime routines, properly clean equipment, and address mask fit issues promptly to ensure comfort and adherence.

Diet and exercise: Mediterranean-style diets rich in fruits, vegetables, and lean proteins support weight management and reduce inflammation. Regular aerobic exercise for 30 minutes daily improves sleep quality and may reduce apnoea severity by 25%.

Sleep environment: Maintaining cool, dark, quiet bedrooms optimizes sleep quality. Elevating the head of the bed 4-6 inches can reduce gravitational effects on airway collapse.

Work accommodations: Employees may require flexible schedules during treatment adjustment periods. Some occupations requiring alertness (commercial driving, aviation) may have specific medical clearance requirements.

Mental health support is crucial, as depression and anxiety commonly accompany sleep apnoea. Support groups, either in-person or online, provide valuable peer experiences and practical tips for treatment success.

Pregnancy and fertility

Sleep apnoea during pregnancy increases risks of gestational hypertension, preeclampsia, and gestational diabetes. Fetal risks include growth restriction and preterm birth. Pregnancy hormones and weight gain can worsen existing sleep apnoea or trigger new cases.

CPAP therapy is safe during pregnancy and should be continued or initiated when indicated. Oral appliances provide alternatives for women unable to tolerate CPAP. Regular monitoring is essential as treatment pressures may need adjustment due to physiological changes.

Fertility impacts are bidirectional – sleep apnoea can reduce fertility in both men and women through hormonal disruptions, while fertility treatments may worsen sleep-disordered breathing through weight gain and fluid retention.

Children

Pediatric sleep apnoea often results from enlarged tonsils and adenoids rather than obesity. Symptoms include mouth breathing, bedwetting, growth delays, behavioral problems, and academic difficulties that may be mistaken for ADHD.

Adenotonsillectomy is first-line treatment for children with tonsillar hypertrophy, with success rates of 70-90%. CPAP therapy may be necessary for children with persistent symptoms or those unable to undergo surgery.

Growth hormone deficiency can result from untreated pediatric sleep apnoea, making early diagnosis crucial. School accommodations may include modified schedules or additional support for attention and learning difficulties.

Transition to adult care should occur around age 18, with emphasis on lifestyle factors that become more relevant in adulthood, such as weight management and avoiding alcohol.

When to see a doctor

Seek immediate medical attention for: Witnessed breathing cessation during sleep, severe daytime sleepiness causing near-miss accidents, morning headaches with confusion, or chest pain associated with sleep disturbances.

Schedule routine evaluation for: Loud, chronic snoring with witnessed apneas, excessive daytime sleepiness interfering with daily activities, morning headaches occurring more than twice weekly, or mood changes accompanied by sleep symptoms.

Partners’ observations are often crucial for diagnosis, as many patients are unaware of their nighttime symptoms. Anyone with multiple risk factors should discuss screening with their healthcare provider.

Regional context

Limited data exists for sleep apnoea prevalence in the Caucasus region, though risk factors such as cardiovascular disease rates in Georgia, Armenia, and Azerbaijan suggest potentially higher prevalence than global averages. Traditional diets high in salt and cultural drinking patterns may contribute to increased risk.

Healthcare infrastructure for sleep medicine varies across the region, with major cities having better access to diagnostic facilities and CPAP equipment. Telemedicine initiatives are expanding access to sleep specialists in rural areas.

GMJ welcomes contributions from regional researchers to build the evidence base for sleep apnoea in the Caucasus, particularly regarding genetic susceptibility patterns and cultural factors affecting diagnosis and treatment adherence.

Research and clinical trials

Current research focuses on alternative therapies including hypoglossal nerve stimulation, combination therapies, and pharmacological approaches targeting specific neurotransmitter pathways. Precision medicine approaches aim to personalize treatment based on individual anatomical and physiological characteristics.

Novel diagnostic tools under development include smartphone apps using sound analysis, wearable devices for continuous monitoring, and artificial intelligence algorithms for improving home sleep testing accuracy.

Drug development targets include respiratory stimulants, anti-inflammatory agents, and medications affecting upper airway muscle tone. ClinicalTrials.gov lists over 200 active studies investigating new treatments and diagnostic approaches.

Frequently asked questions

Will I need to use CPAP forever?

Most patients require long-term CPAP use, but significant weight loss, surgical treatment, or lifestyle changes may reduce or eliminate the need for therapy in some cases.

Can sleep apnoea cause weight gain?

Yes, sleep apnoea disrupts hormones that control hunger and satiety, making weight loss difficult. Treating sleep apnoea often facilitates weight management.

Is snoring always a sign of sleep apnoea?

No, many people snore without having sleep apnoea. However, loud snoring with witnessed breathing pauses warrants evaluation.

Can children outgrow sleep apnoea?

Children may outgrow sleep apnoea caused by enlarged tonsils and adenoids, but follow-up is important as anatomy and risk factors change with growth.

Are there alternatives to CPAP machines?

Yes, alternatives include oral appliances, positional therapy, weight loss, and surgery. The best option depends on individual factors and apnoea severity.

Support and resources

International organizations:
– American Sleep Apnea Association (sleepapnea.org)
– World Sleep Society (worldsleepsociety.org)
– European Sleep Research Society (esrs.eu)
– Sleep Foundation (sleepfoundation.org)

Professional societies:
– American Academy of Sleep Medicine (aasm.org)
– International Association of Sleep Technologists (iast.org)

Patient support groups provide valuable resources for equipment troubleshooting, treatment tips, and emotional support throughout the treatment journey.

Related conditions

Central sleep apnoea – Brain fails to signal breathing muscles properly
Obesity hypoventilation syndrome – Breathing problems in severely obese individuals
Restless leg syndrome – Often coexists with sleep apnoea
Atrial fibrillation – Heart rhythm disorder commonly associated with sleep apnoea
Pulmonary hypertension – Can result from severe, untreated sleep apnoea

Sources: Orphanet (orpha.net), OMIM, GeneReviews (NCBI), WHO ICD-11, UpToDate, relevant EULAR/ACR/WHO guidelines. This article is for informational purposes only and does not constitute medical advice. Content licensed under CC BY 4.0.

Licensed under CC BY 4.0. Free to share with attribution to GMJ News.

Sources: Orphanet (orpha.net), OMIM, GeneReviews (NCBI), WHO ICD-11, EULAR/ACR guidelines. Schema.org MedicalCondition structured data included.