外耳道加圧が回転検査に及ぼす影響

　緒言

　Hennebertが中耳に化膿性炎症のない先天性梅毒患者に外耳道圧迫を行い眼振の起ることを見出して以来，Fistelsymptome ohne Fistelとして，Barany. Beck. Benesie. Ruttin. Mygind. Lund. Stengerその他多くの人々から報告されてきたが先きに吾々は内耳に瘻孔のない，健常者及び内耳機能障碍者について，外耳道圧迫検査を行い，内耳機能障碍者には圧迫眼振の屡々現われることを認め，同時に頭位の変換によつて眼振の方向が変つてくることを報告した。今回吾々は，一耳に圧迫を加えるだけでなく，同時に他耳に吸引を行つた場合の眼振発現状態を観察し，又この種加圧時に回転検査をなし回転後眼振が如何に影響されるかを検討した。

　Takahashi and Taniguchi made observations on the effects of turning tests performed on patients, suffering from inner ear lesions but whose tympanic membrane to be intact, by effecting a positive pressure in the external canal of one ear and a negative pressure in that of the other ear. With application of positive pressure the duration of nystagmus is shortened in time and which will be more pronounced if the ear so treated be the opposite to which the turn is made. Under such a condition the rate of nystagmus will be increased. No difference was noted in the results by applications of the test to patients affected with spontaneous nystagmus. Where symptoms of vertigo are present before hand the test may aggravate them still further but the relation between vertigo and nystagmus was not established.