[Measurement of temperature in the sinus maxillaris (author's transl)]

With a probe of thermoelement in the sinus maxillaris differences of temperature are described dependent on the respiratory cycle. This method is demonstrated on a model of sinus, compared simultaneous by the measurement of velocity (hotwire-anemometry). The values both parameters indicate a gas exchange between nose and sinus depending on the respiratory cycle. The clinical studies were performed during sinuscopy. The probe can be introduced in the sinus over the Hopkins optic. In case of patent ostium a difference of temperature between 31 degrees - 37 degrees C can be registrated, in one respiratory cycle maximum 4 degrees. No change of temperature had been observed in case of obliterated or temporary closed ostium.