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DeKleyn’s test is designed to detect the presence of vertebrobasilar insufficiency.
This test should not be performed if the patient already exhibits any signs or reports any symptoms suggesting vertebrobasilar insufficiency. It’s important to note that this test is considered to have low sensitivity. Therefore a negative test does not exclude the presence of vertebrobasilar insufficiency.
With the patient in the supine position, extend and fully rotate the neck to one side and hold this position for about 30 seconds. Observe the patient’s eyes and ask the patient to report the onset of any symptoms.
The test is considered positive if nystagmus is observed or if the patient reports any symptoms such as diplopia, nausea, vertigo, tinnitus, or sensory disturbance. If the patient has any of these signs and symptoms cease the test immediately and return the head to the neutral position. If the test is negative repeat the procedure with the head rotated to the opposite side.
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