他院求诊

定义

他院求诊 is a test that looks at eye movements to see how well nerves in the brain are working. 这些神经是:

• Vestibular nerve (eighth cranial nerve), which runs from the brain to the ears
• Oculomotor nerve, which controls eye movement
• Trochlear and abducens nerves, which run from the brain to the eyes

选择的名字

英格

How the Test is Performed

Patches called electrodes are placed above, below, and on each side of your eyes. They may be sticky patches or attached to a headband. Another patch is attached to the forehead.

The health care provider will spray cold water or air into each ear canal at separate times. The patches record eye movements that occur when the inner ear and nearby nerves are stimulated by the water or air. When cold water enters the ear, you should have rapid, side-to-side eye movements called nystagmus.

Next, warm water or air is placed into the ear. The eyes should now move rapidly toward the warm water then slowly away.

You may also be asked to use your eyes to track objects, such as flashing lights or moving lines.

The test takes about 90 minutes.

How to Prepare for the Test

Most of the time, you do not need to take special steps before this test.

• Your provider will tell you if you need to stop taking any medicines before you have this test.
• DO NOT stop or change your medicines without talking to your provider first.

How the Test will Feel

You may feel discomfort due to cold water in the ear. During the test, you may have:

• 恶心或呕吐
• Brief dizziness (vertigo)

Why the Test is Performed

The test is used to determine whether a balance or nerve disorder is the cause of dizziness or vertigo.

You may have this test if you have:

• 头晕或眩晕
• 听力损失
• Possible damage to the inner ear from certain medicines

正常的结果

Certain eye movements should occur after the warm or cold water or air is placed into your ears.

Note: Normal value ranges may vary slightly among different laboratories. Talk to your provider about the meaning of your specific test results.

What Abnormal Results Mean

Abnormal results may be a sign of damage to the nerve of the inner ear or other parts of the brain that control eye movements.

Any disease or injury that damages the acoustic nerve can cause vertigo. 这可能包括:

• Blood vessel disorders with bleeding (hemorrhage), clots, or 动脉粥样硬化 of the blood supply of the ear
• 胆脂瘤 和其他 耳朵肿瘤
• 先天性疾病
• 受伤
• Medicines that are toxic to the ear nerves, including aminoglycoside antibiotics, some antimalarial drugs, 循环利尿剂, 和水杨酸盐
• 多发性硬化症
• Movement disorders such as progressive supranuclear palsy
• 风疹
• 一些毒药

Additional conditions under which the test may be performed:

• 听神经瘤
• Benign positional vertigo
• 迷路炎
• 梅尼埃病(又名内耳眩晕

风险

很少, too much water pressure inside the ear can injure your ear drum if there has been previous damage. The water part of this test should not be done if your eardrum has been perforated recently.

注意事项

他院求诊 is very useful because it can record movements behind closed eyelids or with the head in many positions.

参考文献

德卢卡GC，格里格斯RC. Approach to the patient with neurologic disease. In: Goldman L, Schafer AI, eds. Goldman-Cecil医学. 26日艾德. Philadelphia, PA: Elsevier; 2020:chap 368.

Wackym PA. Neurotology. In: win HR, ed. Youmans and Winn Neurological Surgery. 8日艾德. Philadelphia, PA: Elsevier; 2023:chap 16.