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- May 18, 2018 -

Due to the deep position of the throat and the complex physiological structure, it is impossible to directly look through the throat. When examining the throat, special inspection methods are needed, such as indirect laryngoscope, direct laryngoscope, fiberoptic laryngoscope, electronic laryngoscope, stylus laryngoscope, etc. Super-speed cinematography, sound or glottis.

Indirect laryngoscope

Indirect laryngoscopy is the most commonly used laryngeal examination method. The indirect laryngoscope is a flat circular mirror with a handle, the mirror and the handle intersect at 120 degrees, the diameter of the mirror is different, should be based on the subject's pharynx situation to select the appropriate size of the indirect laryngoscopy.

At the time of the examination, the examinee was sitting in a chair, leaned forward, stretched his mouth, covered the first third of the tongue with clean gauze, pulled the tongue forward and down, and heated the indirect laryngoscope but it was not hot and placed in the mouth. The pharynx and deaf subjects took a deep breath and made a "clothes" sound, moving the tongue forward and the epiglottis on the move, illuminating the indirect laryngoscope mirror with the frontal lens or headlamp, and observing the image in the microscope to check the throat structure. When placing in the indirect laryngoscope, the mirror should be face down, quickly and steadily put on the soft palate at 45 degrees to the horizontal plane without touching the tongue, hard palate and tonsil, so as to avoid causing nausea reflex and obstruct the examination. If the subject's pharyngeal reflex is too heavy to fit, a small amount of 1% of tetracaine may be sprayed on the pharynx and then examined. Because the mirror is tilted downwards by 45 degrees, the image of the throat seen in the mirror is reversed from the real position of the throat before and after it is left to right. Due to the limitation of the mirror size of the indirect laryngoscope, the entire throat cannot be seen at the same time. Therefore, the mirror should be rotated slowly and the throat should be checked one by one.

This method has the advantages of being simple, easy to grasp, and less painful for patients. Its limitations include: patients with sensitive pharyngeal reflexes cannot tolerate; patients with poor tongue base and epiglottis lift are not satisfied with the examination of the throat; children due to the throat The characteristics of anatomical development make it difficult to observe the lesions of the larynx.



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