The was identified as a novel and effective parameter for measuring the concavity of the flow-volume curve, providing a more nuanced look at lung impairment than standard metrics alone.

: The study analyzed 61 COPD patients drawn from the Seoul National University Airway Registry (SNUAR) and the Korean Obstructive Lung Disease (KOLD) cohort.

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: Researchers utilized Graphical Analysis 3.4 (Vernier Software) to integrate the area under the curve and calculate new parameters like the Rectangular Area Ratio (RAR) . Key Findings :

: The primary limitations cited by the authors included a small sample size and the fact that most subjects already had moderate-to-severe COPD, leaving the efficacy for "mild" cases less clear. Technical File Note