Restless legs syndrome and sleep disorders — snoring, sleepiness and the cardiovascular trap

Diagnosis: severe obstructive sleep apnoea (OSA) in a high-risk commercial driver. The combination of loud snoring, witnessed apnoeas, gasping, non-restorative sleep and disabling daytime sleepiness in an obese, hypertensive man with a crowded oropharynx is the classic presentation. A STOP-BANG of 7 places him at high pre-test risk, and an AHI of 34 per hour confirms severe OSA (AHI over 30).^[3]

Assessment — take a structured sleep history and screen systematically.

• Confirm the four OSA pillars: loud snoring, witnessed apnoeas, choking or gasping arousals, and excessive daytime sleepiness. Quantify sleepiness with the Epworth Sleepiness Scale (a score over 10 is excessive; over 16 is severe) and ask about road-traffic or occupational near-misses.^[3]
• Examine for risk factors and end-organ damage: BMI and waist circumference, neck circumference (over 40 cm), oropharynx (Mallampati score, tonsillar hypertrophy, retrognathia), blood pressure, and signs of cor pulmonale or metabolic syndrome. Screen for comorbid hypertension, atrial fibrillation, heart failure and type 2 diabetes.^[2]
• Distinguish from mimics: ask about restless legs and leg movements (RLS), cataplexy and sleep paralysis (narcolepsy), and difficulty initiating sleep with worry (insomnia). Exclude hypothyroidism and acromegaly.

Investigation — polysomnography is the diagnostic gold standard. In-laboratory or home respiratory polygraphy calculates the AHI: mild 5 to 14, moderate 15 to 30, severe over 30 events per hour. His AHI of 34 with desaturations to 78 percent is severe OSA.^[3]

Management — a five-strand approach.^[2][3]

1. CPAP — the gold standard for moderate-to-severe OSA. CPAP splints the upper airway open during sleep, abolishes apnoeas, restores oxygenation, restores sleep architecture, reduces daytime sleepiness and lowers blood pressure. Address adherence (mask refit, humidification, pressure relief, behavioural support) — it determines success.
2. Lifestyle measures. Weight loss (aim for 10 percent reduction, which can halve AHI and may cure mild disease), avoid alcohol and sedatives in the evening (they worsen airway collapse), stop smoking, treat nasal obstruction, and positional therapy if events are supine-predominant.
3. Cardiovascular risk management. Treat the hypertension, screen for and manage atrial fibrillation and heart failure, optimise lipids and glycaemia. The cardiovascular rationale is central: untreated OSA drives resistant hypertension, atrial fibrillation, heart failure, stroke and increased mortality through intermittent hypoxia and reoxygenation, sympathetic surges, oxidative stress and intrathoracic pressure swings — and CPAP reverses much of this load.^[2]
4. Driving and occupational safety. He is a commercial driver with disabling sleepiness — advise driving restriction until symptoms are controlled on CPAP and sleepiness has objectively improved, and notify the licensing authority per local regulation. This protects both him and the public.^[3]
5. Alternatives if CPAP fails or is refused. A mandibular advancement device for mild disease or CPAP intolerance; upper-airway surgery (UPPP, maxillomandibular advancement) only in carefully selected anatomically favourable patients; hypoglossal-nerve stimulation in selected moderate-to-severe patients.

The single most important message: screen every snorer with somnolence with STOP-BANG, confirm with polysomnography (AHI), treat with CPAP plus weight loss, and remember that untreated OSA doubles cardiovascular risk and causes road accidents.^[2][3]