Respiratory Health and Sleep Apnea Flashcards

A driver with known COPD develops cor pulmonale. How does this affect his FMCSA certification status?

Answer: It is disqualifying because cor pulmonale indicates cardiovascular compromise from pulmonary disease

Cor pulmonale reflects severe pulmonary hypertension and right heart failure secondary to lung disease, representing a disqualifying cardiovascular complication under FMCSA standards.

Which sleep study type is considered the gold standard for diagnosing obstructive sleep apnea?

Answer: Type I attended in-laboratory polysomnography

Type I attended polysomnography in a sleep laboratory is the gold standard, measuring EEG, EMG, EOG, airflow, effort, and oxygen saturation simultaneously.

A driver on oxygen therapy at 2 L/min for COPD-related hypoxemia asks about certification. What is the FMCSA position?

Answer: Supplemental oxygen use disqualifies a driver from commercial vehicle operation

FMCSA regulations prohibit commercial vehicle operation while using supplemental oxygen because the underlying hypoxemia itself poses a safety risk.

Upper airway resistance syndrome (UARS) differs from classic OSA in which key way?

Answer: UARS produces arousals and daytime sleepiness without meeting AHI criteria for OSA

UARS causes symptomatic daytime sleepiness via repetitive arousals from increased respiratory effort without the AHI thresholds used to diagnose OSA.

A driver with a sleep study showing AHI of 32 is started on CPAP. After 4 weeks of documented compliant use, he reports feeling alert. What certification period is most appropriate?

Answer: 1 year to verify ongoing compliance and treatment efficacy

Initial certification after CPAP initiation is typically limited to 1 year to allow monitoring of sustained compliance and symptom resolution.

Which condition most commonly causes daytime hypercapnia (elevated PaCO2) in a commercial driver with respiratory disease?

Answer: Obesity hypoventilation syndrome

Obesity hypoventilation syndrome causes chronic daytime hypercapnia due to impaired respiratory drive and reduced chest wall compliance from obesity.

A driver has an in-laboratory CPAP titration showing residual AHI of 3.2 at optimal pressure. His follow-up download shows residual AHI of 14 at home. What is the most likely explanation?

Answer: Positional or REM-related OSA is worse at home than in controlled conditions

Home conditions differ from the lab (sleep position, REM proportion, alcohol use) and can reveal residual OSA not apparent during titration.