Neurology · Year 3 · from Neurology

Case 1: Obstructive Sleep Apnea

Patient Demographics

  • Age: 52 years old
  • Sex: Male
  • Occupation: Long-haul truck driver

Chief Complaint

"My wife says I snore so loud she can hear it from the other room, and sometimes I stop breathing. I'm also exhausted during the day."

History of Present Illness

Mr. Robert Thompson is a 52-year-old long-haul truck driver referred by his primary care physician for evaluation of suspected sleep apnea. His wife reports he has snored loudly for years, but over the past 2-3 years, she has witnessed episodes where he appears to stop breathing for 10-20 seconds, then gasps and resumes breathing. He wakes up multiple times at night, often to urinate (3-4 times nightly). Despite getting 7-8 hours in bed, he never feels rested and experiences significant daytime sleepiness. He has fallen asleep at red lights while driving and once nearly ran off the road. He reports morning headaches that resolve within an hour of waking. He denies chest pain or palpitations.

Past Medical History

  • Hypertension (on 3 medications, still not well controlled)
  • Type 2 diabetes mellitus
  • Atrial fibrillation (paroxysmal)
  • Obesity

Medications

  • Lisinopril 40 mg daily
  • Amlodipine 10 mg daily
  • Metoprolol 50 mg twice daily
  • Metformin 1000 mg twice daily
  • Apixaban 5 mg twice daily

Social History

  • Former smoker (quit 5 years ago, 20 pack-year history)
  • Alcohol: 2-3 beers on weekends
  • Long-haul truck driver for 25 years
  • Married, two adult children

Family History

  • Father: Died of MI at age 58
  • Brother: Also uses CPAP for sleep apnea

Physical Examination

  • Vital Signs: BP 158/94 mmHg, HR 78, BMI 38
  • General: Obese male, appears fatigued
  • HEENT:
  • Neck circumference: 19 inches (48 cm)
  • Mallampati score: IV (only hard palate visible)
  • Retrognathia present
  • Nasal passages patent
  • Cardiovascular: Irregular rhythm, no murmurs
  • Pulmonary: Clear to auscultation

Sleep Questionnaires

Epworth Sleepiness Scale: 16/24 (normal <10; >10 abnormal)

  • Sitting and reading: 3
  • Watching TV: 3
  • Sitting inactive in public: 2
  • Passenger in car >1 hour: 3
  • Lying down in afternoon: 3
  • Sitting and talking: 1
  • Sitting quietly after lunch: 1
  • In car, stopped in traffic: 0 (but has actually fallen asleep - denial?)

STOP-BANG Score: 7/8 (HIGH risk for OSA)

  • Snoring: YES
  • Tiredness: YES
  • Observed apneas: YES
  • High blood Pressure: YES
  • BMI >35: YES
  • Age >50: YES
  • Neck circumference >17 inches: YES
  • Gender male: YES

Clinical Image

Image: Anatomical illustration showing the mechanism of obstructive sleep apnea, with airway collapse during sleep due to relaxation of pharyngeal muscles, obesity, and anatomic factors.

Image Source: Wikimedia Commons Attribution: National Heart, Lung, and Blood Institute, Public Domain URL: https://commons.wikimedia.org/wiki/File:Sleep_apnea.jpg

Diagnostic Study: Polysomnography

Key Findings:

  • Total sleep time: 342 minutes
  • Sleep efficiency: 78%
  • Apnea-Hypopnea Index (AHI): 48 events/hour (SEVERE)
  • Obstructive apneas: 156
  • Obstructive hypopneas: 186
  • Central apneas: 4
  • Longest apnea: 42 seconds
  • Oxygen saturation nadir: 71% (significant desaturation)
  • Time SpO2 <90%: 28% of total sleep time
  • Sleep stage distribution: Reduced REM (12%), increased N1 (25%)
  • Supine AHI: 62; Non-supine AHI: 34

Assessment and Diagnosis

  1. Severe obstructive sleep apnea (AHI 48)
  • With significant nocturnal hypoxemia
  • Supine-predominant component
  1. Excessive daytime sleepiness - Epworth 16
  2. Cardiovascular comorbidities likely related to OSA:
  • Resistant hypertension
  • Atrial fibrillation
  1. Occupational safety concern - commercial driver with untreated severe OSA

Severity Classification (AHI)

SeverityAHI (events/hour)
Normal<5
Mild5-15
Moderate15-30
Severe>30

Management Plan

Primary Treatment: CPAP Therapy

  • Prescribed auto-titrating CPAP (APAP) 4-20 cm H2O
  • Nasal pillows interface selected based on patient preference
  • CPAP clinic education scheduled
  • Humidifier added to improve comfort

CPAP Compliance Strategies:

  • Education on benefits and proper use
  • Desensitization (wear mask while awake watching TV)
  • Follow-up in 2 weeks to address any issues
  • Download compliance data at follow-up

Occupational Considerations:

  • Patient counseled that he should NOT drive commercial vehicle until OSA is treated and controlled
  • Federal Motor Carrier Safety Administration guidelines reviewed
  • Medical examiner will need to certify fitness to drive after demonstrating CPAP compliance and symptom resolution
  • Documentation of >4 hours nightly CPAP use required

Lifestyle Modifications:

  • Weight loss goal: 10% body weight reduction
  • Avoid alcohol within 3 hours of bedtime
  • Sleep on side (positional therapy as adjunct)
  • Avoid sedating medications

Cardiovascular Optimization:

  • Expect improvement in BP control with CPAP adherence
  • Continue current medications
  • Follow-up with cardiology for atrial fibrillation

Follow-Up (6 weeks later)

CPAP Compliance Data:

  • Average use: 5.2 hours/night
  • Percentage nights used >4 hours: 78%
  • Residual AHI on CPAP: 3.2 events/hour (well controlled)

Clinical Improvement:

  • Epworth Sleepiness Scale: 7 (normalized, was 16)
  • Blood pressure: 138/84 mmHg (improved)
  • Wife reports no more snoring or witnessed apneas
  • Patient reports feeling "like a new person"
  • Morning headaches resolved
  • Nocturia reduced to 1-2 times

Occupational Clearance:

  • Provided documentation for medical examiner
  • Cleared to return to commercial driving with annual recertification requirement

Teaching Points

  1. STOP-BANG score ≥5 indicates high risk for moderate-severe OSA - score of 7-8 very likely severe
  1. AHI severity classification:
  • Mild: 5-15
  • Moderate: 15-30
  • Severe: >30
  1. OSA is associated with significant cardiovascular morbidity:
  • Resistant hypertension (improves with CPAP)
  • Atrial fibrillation (OSA treatment reduces AF recurrence)
  • Stroke
  • Coronary artery disease
  1. CPAP is first-line treatment for moderate-severe OSA - compliance is key to benefit
  1. Commercial drivers with untreated OSA are a safety hazard - federal regulations require treatment documentation
  1. Weight loss is an important adjunct - 10% weight loss can reduce AHI significantly

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