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Expiratory isovolume pressure-flow curves allow determination of flow limitation and airway resistance, but obtaining an isovolume pressure-flow curve requires placing an esophageal balloon. The stop-flow method of obtaining isovolume pressure-flow curves is easy and noninvasive.

Comparison of Expiratory Isovolume Pressure-Flow Curves With the Stop-Flow Versus the Esophageal-Balloon Method