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Dix-Hallpike : ウィキペディア英語版
Dix–Hallpike test

The Dix–Hallpike test — or Nylen–Barany test — is a diagnostic maneuver used to identify benign paroxysmal positional vertigo (BPPV).
==Process==

The Dix–Hallpike test is performed with the patient sitting upright on the examination table with the legs extended. The patient's head is then rotated to one side by approximately 45 degrees. The clinician helps the patient to lie down backwards quickly with the head held in approximately 20 degrees of extension. This extension may either be achieved by having the clinician supporting the head as it hangs off the table or by placing a pillow under their upper back. The patient's eyes are then observed for about 45 seconds as there is a characteristic 5–10 second period of latency prior to the onset of nystagmus. If rotational nystagmus occurs then the test is considered positive for benign positional vertigo. During a positive test, the fast phase of the rotatory nystagmus is toward the affected ear, which is the ear closer to the ground. The direction of the fast phase is defined by the rotation of the top of the eye, either clockwise or counter-clockwise. Home devices are available to assist in the performance of the Dix–Hallpike Maneuver for patients with a diagnosis of BPPV.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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