Fig. 2From: Hypopnea definitions, determinants and dilemmas: a focused reviewThis figure shows a hypopnea scored using the recommended criteria IVA of the 2012 AASM Scoring guidelines – requiring a ≥ 30% decrement in flow associated with a ≥ 4% decrease in oxygen saturation. Note the progressively increasing and elevated Δ Pes that confirm the obstructive etiologyBack to article page