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Dec 02, 2008 -
If you've ever had a little too much to drink, you probably experienced that dizzy sensation where you feel like the room is spinning, know as vertigo in medical-ese. Unfortunately, people diagnosed with Meniere's disease don't have to drink in order to experience such debilitating dizzy spells. Vertigo episodes occur out of the blue, with no apparent cause, in some cases lasting up to eight hours.
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Sep 03, 2008 -
Overview
- Definition
- Alternative Names
- Causes, incidence, and risk factors
- Symptoms
- Signs and tests
- Treatment
- Expectations (prognosis)
- Complications
- Calling your health care provider
- Prevention
Illustrations
Ear anatomy
Tympanic membrane
HEALTH GUIDE REFERENCE FROM A.D.A.M
Definition
Meniere's disease is a disorder of the inner ear affecting balance and hearing, characterized by abnormal sensation of movement (vertigo), dizziness, loss of hearing in one or both ears, and noises or ringing in the ear (tinnitus).
Alternative Names
Hydrops; Endolymphatic hydrops
Causes, incidence, and risk factors
The fluid-filled semicircular canals (labyrinths) of the inner ear, in conjunction with the cranial nerve VIII, control balance and sense of body position. Meniere's disease involves a swelling of part of the canal (endolymphatic sac).
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Sep 04, 2008 -
Overview
- Definition
- Alternative Names
- Common Causes
- Home Care
- Call your health care provider if
- What to expect at your health care provider's office
- Prevention
- References
Illustrations
Carotid stenosis, X-ray of the left artery
Carotid stenosis, X-ray of the right artery
Vertigo
Balance receptors
HEALTH GUIDE REFERENCE FROM A.D.A.M
Definition
Dizziness is lightheadedness, feeling like you might faint, being unsteady, loss of balance, or vertigo (a feeling that you or the room is spinning or moving).
Most causes of dizziness are not serious and either quickly resolve on their own or are easily treated.
Alternative Names
Lightheadedness - dizzy; Loss of balance; Vertigo
Common Causes
Lightheadedness happens when there is not enough blood getting to the brain.
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Sep 04, 2008 -
Overview
- Definition
- Alternative Names
- How the test is performed
- How to prepare for the test
- How the test will feel
- Why the test is performed
- What abnormal results mean
- What the risks are
- Special considerations
Illustrations
Brain
MRI scans
Lobes of the brain
HEALTH GUIDE REFERENCE FROM A.D.A.M
Definition
An MRI of the head is a noninvasive procedure that uses powerful magnets and radio waves to construct clear, detailed pictures of brain tissues.
Conventional radiography and computed tomographic (CT) imaging use potentially harmful radiation (x-rays) that passes through a patient to generate images. Magnetic resonance imaging (MRI) is based on the magnetic properties of atoms, and there is no exposure to the same type of radiation used in x-rays and CT scans.
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Sep 04, 2008 -
Overview
- Definition
- Alternative Names
- Considerations
- Common Causes
- Home Care
- Call your health care provider if
Illustrations
External and internal eye anatomy
HEALTH GUIDE REFERENCE FROM A.D.A.M
Definition
Uncontrollable eye movements are involuntary, rapid, and repetitive movement of the eyes.
Alternative Names
Back and forth eye movements; Involuntary eye movements; Nystagmus; Rapid eye movements from side to side; Uncontrolled eye movements
Considerations
Nystagmus refers to rapid involuntary movements of the eyes that may be from side to side (horizontal nystagmus), up and down (vertical nystagmus) or rotary. Depending on the cause, these movements may be in both eyes or in just one eye.
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Sep 04, 2008 -
Overview
- Definition
- Alternative Names
- How the test is performed
- How to prepare for the test
- How the test will feel
- Why the test is performed
- Normal Values
- What abnormal results mean
- What the risks are
Illustrations
Brain
Brain wave monitor
HEALTH GUIDE REFERENCE FROM A.D.A.M
Definition
An electroencephalogram (EEG) is a test to detect problems in the electrical activity of the brain.
Alternative Names
Electroencephalogram; Brain wave test
How the test is performed
Brain cells communicate by producing tiny electrical impulses. In an EEG, electrodes are placed on the scalp over multiple areas of the brain to detect and record patterns of electrical activity and check for abnormalities.
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Sep 04, 2008 -
Overview
- Definition
- Alternative Names
- How the test is performed
- How to prepare for the test
- How the test will feel
- Why the test is performed
- What abnormal results mean
- What the risks are
- Special considerations
HEALTH GUIDE REFERENCE FROM A.D.A.M
Definition
A cranial CT scan is computed tomography of the head, including the skull, brain, orbits (eye sockets), and sinuses.
Alternative Names
Head CT; CT scan - skull; CT scan - head; CT scan - orbits; CT scan - sinuses
How the test is performed
A head CT will produce an image from the upper neck to the top of the head. It is important that once your head is in place, you do not move it during the test; if you are unable to keep your head still, immobilization may be needed.
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Sep 04, 2008 -
Overview
- Definition
- Alternative Names
- How the test is performed
- How to prepare for the test
- How the test will feel
- Why the test is performed
- Normal Values
- What abnormal results mean
- What the risks are
HEALTH GUIDE REFERENCE FROM A.D.A.M
Definition
Electronystagmography is a test to look at voluntary and involuntary eye movements. It evaluates the acoustic nerve, which aids with hearing and balance.
Alternative Names
ENG
How the test is performed
Patches called electrodes (similar to those used with ECG, but smaller) are placed to above, below, and to the side of each eye.
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Sep 04, 2008 -
Overview
- Definition
- Alternative Names
- How the test is performed
- How to prepare for the test
- How the test will feel
- Why the test is performed
- Normal Values
- What abnormal results mean
- What the risks are
- Special considerations
- References
Illustrations
Ear anatomy
HEALTH GUIDE REFERENCE FROM A.D.A.M
Definition
An audiology exam tests your ability to hear sounds. Sounds vary according to the intensity (volume or loudness) and the tone (the speed of sound wave vibrations).
Hearing occurs when sound waves move to the nerves of the inner ear and then the brain.
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Sep 04, 2008 -
Overview
- Definition
- Alternative Names
- How the test is performed
- How to prepare for the test
- How the test will feel
- Why the test is performed
- Normal Values
- What abnormal results mean
- What the risks are
- Special considerations
- References
HEALTH GUIDE REFERENCE FROM A.D.A.M
Definition
Caloric stimulation is a test which uses differences in temperature to diagnose ear nerve damage.
Alternative Names
Caloric test
How the test is performed
This test stimulates the inner ear and nearby nerves by delivering cold and warm water to the ear canal at different times. Sometimes, the test is done using air instead of water.
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Shiseido
Notify Jeans
Levi's