Two simplified methods for estimating velopharyngeal orifice area

Two simplified methods for obtaining estimates of the area of the velopharyngeal orifice using nasal airflow and orifice differential pressure measures are described. In these methods, orifice areas are estimated by merely coordinating points on a graph or by interpolating values from a table. The accuracy of orifice area estimation by these methods compares favorably with estimation by other currently used methods. These simplified methods were developed to enlarge the application of hydraulic techniques by practicing clinicians.