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Fig. 1 | Sleep Science and Practice

Fig. 1

From: Hypopnea definitions, determinants and dilemmas: a focused review

Fig. 1

This figure shows an obstructive apnea. An apnea is a respiratory event lasting ≥10 s, characterized by a decrement in airflow of ≥90% from the baseline in the oronasal thermocouple signal. Clear crescendo effort in the abdominal belt suggests obstruction. Elevated and progressively increasing values in the Δ Pes during the event confirm the obstructive etiology

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