Understanding aerodynamics in the correction of the narrow nose.

Nasal obstruction can be relieved in the prominent and narrow nose by a nasal widening procedure called the "let out" based on the "en bloc" mobilization used in the "push down" rhinoplasty. Calculations using measurements made on the cadaver show that widening of the angle of the liminal valve and an increased rigidity of the upper lateral cartilage are responsible for the improved airway rather a presumed increase of the cross section of the valve. The associated increase of intranasal velocity provides an aerodynamic explanation for certain phenomenons observed after cosmetic rhinoplasties. A clinical case is presented and the principles of "en bloc" mobilization are shown by line drawings.