During a diagnostic sleep study, which device should be used to monitor airflow?

During a diagnostic sleep study, which device should be used to monitor airflow?

• A. Pressure transducer
• B. Oronasal thermal sensor
• C. Inductance plethysmography
• D. Intercostal EMG

Answer: (B)

Monitoring airflow directly in a diagnostic sleep study is best done with an oronasal thermal sensor. This sensor sits near the nose and mouth and detects breath-by-breath airflow by measuring temperature changes as air moves in and out. It provides a clear airflow waveform, which helps identify apneas (no airflow) and hypopneas (reduced airflow) during sleep. Other sensors measure related but different things: a pressure transducer infers airflow from pressure changes in the nasal/oral passages and can be affected by leaks or mouth breathing; inductance plethysmography tracks chest and abdominal movements to estimate breathing effort rather than actual airflow; intercostal EMG monitors muscle activity, not breathing flow.

Monitoring airflow directly in a diagnostic sleep study is best done with an oronasal thermal sensor. This sensor sits near the nose and mouth and detects breath-by-breath airflow by measuring temperature changes as air moves in and out. It provides a clear airflow waveform, which helps identify apneas (no airflow) and hypopneas (reduced airflow) during sleep.

Other sensors measure related but different things: a pressure transducer infers airflow from pressure changes in the nasal/oral passages and can be affected by leaks or mouth breathing; inductance plethysmography tracks chest and abdominal movements to estimate breathing effort rather than actual airflow; intercostal EMG monitors muscle activity, not breathing flow.