Fiberoptic endoscopic evaluation of swallowing is currentlyused for diagnosis of dysphagia. The endoscope is, however, not reliable for measuring the pharyngeal amplitude. We developed a new method of pharyngeal measurement using a fiberscope with built-in reticle.
The ENF-P4 fiberscope (Olympus Co. Ltd., Japan), with a built-in reticle with check patterns to rectify radialdistortion by a lens, was used in this study. In order to know the inserting length of the fiberscope, we mea suredthe length of the airway from the nasal edge to the epiglottis on lateral cephalograms with the subjects including 14 males and 24 females (mean age 22.1 years). Single regression analysis between stature and airway length was performed. We examined twice the sizes of 10 epiglottises with the fiberscope through digital video pictures.
The average of the airway length was 141.1mm for males and 130.0mm for females. A significant correlation was found between height and airway length (r=0.693, p<0.01). Comparing between the first and second ob servations, the use of the reticle improved a reliability of projective analysis of the pharynx area.
The fiberscope with built-in reticle may be used for relative analysis of the pharyngeal amplitude. Our de viceappeares to be useful for evaluation of laryngopha ryngeal structure.
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