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Biomedical subjects

K Müsebeck

Publications and source records attributed to K Müsebeck.

At least 19 recordsLinked to original sources
PubMed1983

[Phonatory airflow in the supraglottal space].

The phonatory airflow can be measured by means of a hot wire tube placed in the supraglottic space without tying down the tongue. The velocity of airflow above the glottis reaches values around c = 50 to 150 cm/s. The variations in airflow oscillations were recorded. The voice of the person under examination was picked up by a condenser microphone (Bruel & Kjaer No. 2112). According to D'Alembert's wave equation, the sound intensity is related to the velocity of the phonatory air stream. The validity of this statement has been confirmed by repeated testing. The fundamental frequency of voice and of the airflow were analysed synchronously by means of the Nicolet analyser. The air consumption is not utilized for sound production in phonation by breathing. A "hard" or "pressed" voice is associated with diminished or irregular air consumption. The method can be employed in assessing the conditions of phonetic airflow in normal and dysphonic voices.

Air↗
PubMed1982

[Aerodynamic aspects in the concept of treatment in chronic sinusitis maxillaris (author's transl)].

Hitherto the conditions of air flow had been neglected in the concept of treatment of chronic inflammation of the maxillary sinus. Our experimental and clinical studies with measurement of airflow and temperature yielded several aspects of clinical importance as follows: The maximum size of the operated opening in the antral wall should be more than 10 X 10 mm. to achieve optimal ventilation. If there are two meatal open windows, the operated fenestration in the inferior meatus, for example, and the ostium maxillaris in the middle meatus, an "aerodynamic short circuit" arises. This results in insufficient ventilation. Large fenestrations have the same effect.

Biophysical Phenomena↗
PubMed1980

[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.

Body Temperature↗
PubMed1979

Measurement of velocity of air flow in the sinus maxillaris.

Anemometry with the hot wire and hot film technique previously described, enables the rhinologist to record slow and rapidly changing air flow in the maxillary sinus. The advantages and disadvantages of this method are considered. Anemometry together with manometry may be designated sinumetry and used as a diagnostic procedure following sinuscopy in chronic maxillary sinus disease. The value of the function from velocity of time allows the estimation of flow-volume in the sinus. Furthermore, the method is useful to evaluate the optimal therapy to restore ventilation in the case of an obstructed ostium demonstrated before and after surgical opening in the inferior meatus.

Humans↗
PubMed1978

Measurement of air flow in the maxillary sinus by hot-film technique.

A method of hot-film-anemometry was developed to investigate the velocity of air flow in the maxillary sinus which has hitherto not been detected by other methods. The hot-film-probe can registrate the slow but rapidly changing air flow dependent on the respiratory cycles. This study was performed during sinuscopy. The average of measurement values by quiet respiration was found in the sinus of 8 cm/sec during a velocity in the nose of 5 m/sec. The respiratory fluctuations in the nose induce a movement stream of circulation in the sinus. When inspiration changes to expiration there was still a flow but at a lower degree. No flow in the sinus could be observed between respiratory cycles. After sniffing the velocity peak rises to higher values. The air flow in the sinus depends on the patency of the ostium. In case of a reduced air flow we can distinguish between a partially open ostia and an obstructed one. The measurement demonstrates an injector-effect beside the influence of pressure difference and diffusion on the ventilation of the sinus.

Air↗
PubMed1978

[Examination of patency of ostium by measurement of air flow in the maxillary sinus (author's transl)].

The patency of the maxillary ostium can investigated by measurement of velocity and of presure difference with a new equipment of hot film anemometry and by strain gauges. This studies were performed during sinuscopy. The values are registered on a way-time recorder. The measurement of velocity in the maxillary sinus is more preferable than the measurement of pressure because we need no extraantal point of reference pressure: nose-sinus: difference pressure: sinus atmosphere. Both methods, the measurement of air flow and pressure difference, can proof the patency of the maxillary ostium. Examples are given from open partial patent ostium and from obstructed one.

Endoscopy↗