Effects of nasopharyngeal cocaine or pharyngeal benzocaine on esophageal motility.

The esophageal effect of topical anesthetics applied to the nasopharynx was evaluated. Eight healthy volunteers underwent an esophageal motility study after each of the following: no anesthesia, 5% cocaine solution applied to the nasopharynx, and 20% benzocaine spray applied to the pharynx. Upper esophageal sphincter relaxation was prolonged after use of the 5% cocaine solution. No other significant effects on esophageal motility or pressures were noted.