Obstructive sleep apnea affects 15–20% of Indian adults and silently damages the brain, heart, and blood vessels. Dr. Anand Karnam explains the symptoms, the CPAP treatment, and why morning headaches and daytime sleepiness are red flags.
Key Points
- Obstructive sleep apnoea (OSA) affects 15% of Indian adults — obesity and a large neck circumference are the biggest risk factors.
- Classic features: loud snoring, witnessed breath-stopping, excessive daytime sleepiness, morning headaches.
- Untreated OSA doubles the risk of hypertension, stroke, diabetes, and atrial fibrillation.
- CPAP (continuous positive airway pressure) is the gold standard treatment — dramatically improves symptoms.
- Weight loss of 10% can reduce OSA severity by 30% — lifestyle intervention is as important as CPAP.
15%
of Indian adults have obstructive sleep apnoea
Source: ICMR
2×
higher stroke and hypertension risk with untreated OSA
Source: AHA
30%
reduction in OSA severity with 10% body weight loss
Source: Cochrane
"I tell patients: your snoring is not just a social problem — it is your brain and heart being deprived of oxygen 30–40 times an hour. CPAP is not comfortable at first, but the improvement in energy, mood, and blood pressure is usually dramatic within 2 weeks."
Obstructive sleep apnea (OSA) is a sleep disorder in which the upper airway repeatedly collapses during sleep, causing episodes of stopped breathing (apneas — lasting 10 seconds or more) and reduced breathing (hypopneas) throughout the night. Each event causes oxygen levels to fall and carbon dioxide to rise, triggering an arousal from deep sleep — too brief to be remembered but sufficient to fragment sleep architecture and prevent restorative sleep. In severe OSA, these events can occur hundreds of times per night.
Symptoms
Night symptoms: Loud, habitual snoring; witnessed apneas (the partner sees breathing stop); gasping or choking arousals; restless sleep; nocturia (waking to urinate — caused by the increased intrathoracic pressure during apneas triggering atrial natriuretic peptide release). Morning symptoms: Non-refreshing sleep; morning headache (from CO2 retention during night apneas); dry mouth. Daytime symptoms: Excessive daytime sleepiness (the STOP-Bang questionnaire is a validated screening tool); cognitive impairment — memory, concentration, executive function; mood disturbance; increased accident risk (driving and occupational).
Neurological and Cardiovascular Consequences
Untreated OSA: doubles the risk of stroke; causes hypertension (OSA is the most common secondary cause of hypertension — frequently missed); increases risk of atrial fibrillation; causes intermittent hypoxia that directly damages brain white matter, hippocampus, and prefrontal cortex. OSA is a strong independent risk factor for Alzheimer's disease — impaired glymphatic clearance of amyloid during fragmented sleep is a proposed mechanism.
Diagnosis and Treatment
Home sleep apnea test or polysomnography (sleep study): records oxygen saturation, airflow, respiratory effort, and EEG during sleep. Severity: mild (AHI 5–15/hour), moderate (15–30/hour), severe (above 30/hour). CPAP (Continuous Positive Airway Pressure): the gold standard treatment — a mask delivering pressurised air to hold the airway open during sleep. Transformative in severe cases. Alternatives: mandibular advancement device (for mild-moderate); weight loss (essential adjunct); positional therapy (for positional-predominant OSA); surgical options (tonsillectomy in children; uvulopalatopharyngoplasty). Sri Anand CNC, Chanda Nagar, Hyderabad. Call +91 90633 66983.
Dr. Anand Karnam
DrNB Neurology · Sri Anand CNC, Chanda Nagar Hyderabad · Sri Anand Child and Neuro Center
DrNB-qualified Neurologist, Fellow of the World Headache Society (FWHS), and Headache Specialist with 12+ years of experience treating epilepsy, stroke, migraine, and movement disorders. Practices at Sri Anand Child and Neuro Center, Chanda Nagar, Hyderabad.
References & Sources
- 1.Sleep Apnoea — NCBI StatPearls — NCBI StatPearls
- 2.Sleep Apnoea — NHS — NHS UK
- 3.Sleep Apnea — NIH MedlinePlus — NIH MedlinePlus
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