Ambient pressure tympanometry in the workup of patulous eustachian tube and neurotologic disorders.

In contrast to previous reports, respiration-synchronous APT wave patterns display low sensitivity (53.3%) in our retrospective cohort of 15 PET ears, as diagnosed by characteristic symptoms and otoscopy. In 327 non-PET ears, the largest cohort of non-PET ears evaluated to date, respiration-synchronous APT wave patterns demonstrate high specificity for PET (93.9%), consistent with previous literature. APT performed solely at rest and with ipsilateral nostril respiration displays similar sensitivity for PET as the full battery of respiratory maneuvers. Pulse-synchronous wave patterns at rest may suggest an alternative neurotologic diagnosis requiring further workup, such as superior semicircular canal dehiscence. Ambient pressure tympanometry is a rapid, simple and widely available tool that can be integrated into general otolaryngology clinics and warrants further study in the evaluation of PET and neurotologic disorders.