studio medico

Una prima indagine sistematica eseguita presso la clinica otorinolaringoiatrica del Campus Charité Mitte dell’Università di Medicina di Berlino ha preso in esame, in una camera pressurizzata, un gruppo selezionato di soggetti con noti problemi alle orecchie in aereo. È stato dimostrato che l’uso del filtro ritarda la variazione di pressione, riducendo in maniera significativa la sensazione di dolore.

(Jumah et al., Pressure regulating ear plug testing in pressure chamber, Aviation, Space and Environmental
Medicine, giugno 2010)


Pressure regulating ear plug testing in a pressure

Pressure regulating ear plug testing in a pressure chamber.

Jumah MD, Schlachta M, Hoelzl M, Werner A, Sedlmaier B.
Department of Otolaryngology, Head & Neck Surgery, Campus Charité Mitte, Charité ©-University Medicine Berlin, Germany.

Abstract

INTRODUCTION: Middle ear barotrauma is a condition frequently associated with flying. It is usually caused by Eustachian tube (ET) dysfunction. Pressure-regulating earplugs (PREP) should improve complaints due to pressure equalization problems.

METHODS: There were 21 patients with a history of pressure equalization problems while flying who were examined. ET function was measured with exploratory tests and in a pressure chamber. In a double-blind study, PREP were examined using continuous impedance measurement in the pressure chamber. Eardrum deflection and pressure-equalizing maneuvers were also examined. During pressure exposure the subjective state of patients with and without PREP was compared.

RESULTS: Evidence of ET dysfunction was found in twice as many patients with the impedance method in a pressure chamber compared to tympanometry or the Valsalva test. Use of PREP reduced the rate of pressure changes in the external auditory canal. Maximum pressure was reached with a delay of about 7 min. The number of pressure-equalizing maneuvers did not differ significantly. Using PREP the patients reported a significantly better subjective state on the VAS scale of 2.19 +/- 1.50 compared to 3.38 +/- 2.33 without PREP.
CONCLUSIONS: Continuous impedance measurements in the pressure chamber identified ET dysfunction more often than the exploratory ET function tests commonly used in routine diagnostics. This novel finding requires further validation. Although use of PREP showed no signs of improving ET function, it did significantly improve individual subjective state during sudden pressure changes.

Quelle:
http://www.ncbi.nlm.nih.gov/pubmed/20540447

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