舌根沈下発現の要因

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  • Mechanism of Tongue Swallowing.

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To elucidate the mechanism of tongue swallowing which is closely related to snoring and obstructive sleep apnoea, the distance between the root of the tongue and the posteior wall of the hypopharynx was measured in paired radiograms in the lateral projection obtained under two conditions in each of the following four situations:<br>(1) upright and supine positions with mouth closed (35 patients); (2) with closed and opened mouth in the supine position (78 patients); (3) the jaw occluded and not occluded in the supine position with the mouth shut (57 patients); and (4) the same situation as (3) but nasal breathing required (43 patients).<br>The incidence of a narrowed hypopharynx (i. e., tongue swallowing) in each latter condition was 57.1% with situation (1) and 45.6% with situation (3) while it was significantly higher (p<0.001) with situation (2)(89.7%) and situation (4)(85.7%).<br>When the relationship between varying conditions and measurements was examined by the paired-T test, situation (1) with t=0.37 and situation (3) with t=0.34 showed a negative statistical significance, whereas situation (2) with t=9.46 and situation (4) with t=9.35 were positive (p<0.01).<br>The results indicate that opening the mouth is factor contributing most to tongue swallowing and that sustained nasal breathing during sleep is very important in the treatment and prevention of snoring and obstructive sleep apnoea.

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