PROBLEM: Sonotubometry is a non-invasive method for the evaluation of Eustachian Tube (ET) function. Perfect Sequences (PSQE) allow monitoring the ET under physiologic conditions in healthy ears. This study investigates the use of this new approach in pathologic ears.
METHODS: Forty individuals were examined. Group A: n = 20 individuals (40 normal ears). Group B: n = 11 patients (16 ears) with acute/subacute ET dysfunction. Group C: n = 9 patients with chronic problems requiring tympanoplasty. Sonotubometry was performed before and after operation. As opening maneuvers, yawning, dry swallowing, water swallowing, and Toynbee were employed.
RESULTS: In group A an ET opening was seen in 77.06% maneuvers and in all patients. The median amplitude (A) of sound increase was 16.64 dB, the duration of the openings (D) was 365 ms. In group B these values were 34.39%, A = 9.27 dB, D = 311 ms before and 72.26%, A = 19.51 dB and D = 329 ms after operation (myringotomy/tympanostomy). Group C showed openings in 33.83% with A = 9.78dB and D = 365 ms. There was no significant change after surgery.
CONCLUSION: The comparison between normal ears and acute ET dysfunction shows sonotubometrical a return of the normal function after operation within a week in most ears. The results demonstrate that the findings occur not only due to an improved sound transmission through the dry middle ear but from a recovering ET. The results in Group C show that the ET dysfunction is chronic.
SIGNIFICANCE: Sonotubometry with PSEQ is feasible for assessment of ET (dys)function under physiological conditions. It has therefore the potential to open new perspectives on ET monitoring.
SUPPORT: Supported by DFG-grant MA 3917/1-1.