|
| | |
Electroretinogram
Electroretinogram ERG. A test that measures the functional integrity of the retina, including the rod and cone photoreceptors. Usually involves the use of dilating drops in the eye and use of a contact lens electrode.
RELATED TERMS--------------------------------------
ERG
Electroretinography.
Retina
A membrane lining the inside of the back of the eye that contains light-sensitive nerve cells that convert focused light into nerve impulses, making vision possible.
Cone
One of the two light receiving retinal cells (the other is the rod) that is responsible for daylight vision (e.g., color vision, high visual acuity, bright light vision). The area of the retina that provides central or reading vision, known as the fovea, contains only cones.
Dilating
The widening and opening of the cervix caused by uterine contractions.
Lens
The lens of the eye is like an adjustable lens of a camera and focuses light rays on to the retina for sharp images. A condition called presbyopia occurs when the lens is no longer able to adjust for objects at different distances.
SIMILAR TERMS--------------------------------------
Elective
In medicine, something chosen (elected). An elective procedure is one that is chosen (elected) by the patient or physician that is advantageous to the patient but is not urgent.
Elective mutism
Failure to speak, or to be able to speak about certain topics, that is not necessarily permanent but is reversible under changed circumstances.
Elective surgery
Surgery that is subject to choice (election). The choice may be made by the patient or doctor. For example, the time when a surgical procedure is performed may be elective. The procedure is beneficial to the patient but does not need be done at a particular time. As opposed to urgent or emergency surgery.
Electro-oculography
EOG. A type of electrophysiologic retinal testing done to measure the difference in the electrical potential between the front and back of the eye in response to dark and light.
Electrocardiogram
ECG or EKG. A test that records the electrical activity of the heart, shows abnormal rhythms (arrhythmias or dysrhythmias), and detects heart muscle damage.
Electrocardiogram (EKG or ECG)
A test that records on graph paper the electrical activity of the heart via small electrode patches attached to the skin. An EKG helps a physician determine the causes of abnormal heartbeat or detect heart damage.
Electrocoagulation
A procedure that uses an electrical current passed through an endoscope to stop bleeding in the digestive tract and to remove affected tissue.
Electrocochleography
A test that measures the electrical potentials generated in the inner ear in response to stimulation by sound. Electrocochleography may be done, for example, to confirm the diagnosis of Ménière disease. Abbreviated ECochG (or ECoG).
Electroconvulsive
A type of therapy used to treat severe, unresponsive depression by passing electrical current through the brain.
Electroconvulsive therapy
A procedure in which an electric current is passed through the brain to produce controlled convulsions (seizures) to treat patients with depression, particularly for those who cannot take or are not responding to antidepressants, have severe depression, or are at high risk for suicide. Electroconvulsive therapy (ECT) is believed to act by a massive neurochemical release in the brain due to the controlled seizure. The most common side effect is short-term memory loss, which usually resolves quickly. ECT typically relieves depression within 1 to 2 weeks after beginning treatments.
Electrocutophilia
A paraphilia of the sacrificial and expiatory stratagem in which sexuoerotic arousal and orgasm is dependent upon the use of electrical stimulation of the body to possibly include the nipples, urethra, penis/scrotum, vulva/clitoris/vagina and anal/rectal tissues. This paraphilia has been seen to occur more frequently among women than in men and has also resulted in accidental death. The activities of electrocutophilia may be exploratory or varietal sex play and not a paraphilia. It also may be part of a sadomasochistic repertory. Devices for "safe" sexuoerotic electrostimulation are now commercially available.
Electrodesiccation
Use of an electric current to destroy cancerous tissue and control bleeding.
Electroencephalogram
A study of electrical current within the brain. Electrodes are attached to the scalp. Wires attach these electrodes to a machine which records the electrical impulses. The results are either printed out or displayed on a computer screen. Electroencephalogram is abbreviated EEG. Different patterns of electrical impulses can denote various problems within the brain including different forms of epilepsy. Most EEGs see only a moment in time within the brain, and can catch only gross abnormalities in function. An overnight EEG is designed to check the electrical activity in the brain of a sleep-deprived patient, increasing the chance that seizure activity will be revealed. Also available are 24- or 48-hour EEGs, which measure electrical activity over one or two days, usually using mobile EEG units.
Electrogastrogram
An electrogastrogram is a study in which the electrical current generated by the muscle of the stomach is sensed and recorded. Thus, it is analogous to an electrocardiogram of the heart. The electrogastrogram, like the electrocardiogram, is performed by taping electrodes to the skin; however, in the case of the electrogastrogram the electrodes are placed on the upper abdomen over the stomach. The recordings from the muscle are stored and analyzed by a computer. The electrogastrogram is performed to diagnose motility disorders of the stomach, that is, when the muscles of the stomach are not working normally.
Electrolarynx
A battery-operated instrument that makes a humming sound to help people who have lost their larynx to talk.
Electrolysis
For cosmetic reasons, a method of removing hair by inserting a needle into the hair-growing follicle and killing it with a pulse of electric current.
Electrolyte
One of the substances in the blood that helps to regulate the proper balance of body fluids. Examples of electrolytes include sodium and potassium.
Electrolytes
Chemicals such as salts and minerals needed for various functions in the body.
Electromyogram
EMG. A test to evaluate nerve and muscle function.
Electromyography (EMG) and Nerve Conduction Velocity (NCV) Studies
Tests used to diagnose neuropathy and check for nerve damage. These tests are usually both run at the same time, using the same equipment.
Electron beam computerized tomography (EBCT)
A new noninvasive test for the detection of coronary artery disease (CAD). EBCT, or Ultrafast CT (as the technique will be termed here) is designed to measure calcium deposits in the coronary arteries.
Electron microscope
Abbreviated EM. A microscope in which an electron beam replaces light to form the image. EM has its pluses (greater magnification and resolution than optical microscopes) and minuses (you are not really "seeing" objects, but rather you are looking at their electron densities, and meaningless artifacts may abound). Nonetheless, EM has extended the range of the microscope.
Electron microscopy
Abbreviated EM. Microscopy in which an electron beam replaces light to form the image. EM has its pluses (greater magnification and resolution than optical microscopes) and minuses (you are not really "seeing" objects, but rather you are looking at their electron densities, and meaningless artifacts may abound). Nonetheless, EM has extended the range of the microscope.
Electronic fetal monitor
A device that monitors a fetus's progress and vital signs when a woman is in labor. Records the fetal heartbeat and the mother's contractions.
Electronystagmogram
A recording of the eye movements, usually done to confirm the presence of nystagmus. Electronystagmogram may be done in cases of vertigo (dizziness) to determine if there is damage to the vestibular portion of the acoustic nerve. The test may be done in cases of possible acoustic neuroma, Meniere disease, positional vertigo, and labyrinthitis. Abbreviated ENG.
Electronystagmography
A neurologic test which measures fine motor movements of the eye muscles, used to confirm the presence of nystagmus.
Electrooculogram
EOG. A test of the functional integrity of the Retinal Pigment Epithelium (RPE) – a layer of cells next to the retina of the eye. The EOG involves electrodes attached to the inner and outer corners of the eye and the patient is required to look back-and-forth between two small lights in a large white globe (ganzfeld) with bright lights on and off.
Electrophoresis
A process by which molecules (such as proteins, DNA, or RNA fragments) can be separated according to size and electrical charge by applying an electric current to them. Each kind of molecule travels through the medium at a different rate, depending on its electrical charge and molecular size.
Electrophoretic
Pertaining to electrophoresis, the separation of molecules according to their size and electrical charge by applying an electric current to them.
Electrophysiologic
Pertaining to electrophysiology.
Electrophysiologic retinal testing
Testing done to diagnose specific disorders of the retina, including inherited retinal diseases, the effects of toxic drug exposure on the retina, and the presence of foreign bodies within the eye.
Electrophysiologic study of the heart
A test of the electrical conduction system of the heart (the system that generates the heart beat).
Electrophysiological
Pertaining to electrical results produced through physiological agencies, or by change of action in a living organism.
Electrophysiological study (EPS)
A cardiac catheterization to study electrical current in patients who have arrhythmias.
Electrophysiology
That branch of physiology which treats of electric phenomena produced through physiological agencies.
Electrophysiology (EP) Study
An EP Study is a recording of the electrical activity your heart. This test is used to help your doctor find out the cause of your rhythm disturbance and the best treatment for you. During the test, your doctor may safely reproduce your arrhythmia, then give you medications to see which one controls it best.
Electroretinography
Abbreviated ERG. A test in which the electrical potentials generated by the retina of the eye are measured when the retina is stimulated by light. In an ERG, an electrode is placed on the cornea at the front of the eye. The electrode measures the electrical response of the rods and cones, the visual cells in the retina at the back of the eye. An ERG may be useful in the evaluation of hereditary and acquired disorders of the retina. A normal ERG shows the appropriate responses with increased light intensity. An abnormal ERG is found in conditions such as arteriosclerosis of the retina, detachment of the retina, and temporal arteritis with eye involvement. The instrument used to do electroretinography is an electroretinograph and the resultant recording is called an electroretinogram.
Electrosurgery
Instead of using a scalpel, the surgeon utilizes a heat-generating electrical device to burn or vaporize tissue in order to remove it and minimize and halt bleeding.
PREVIOUS AND NEXT TERMS--------------------------------------
Estraderm
A medicine used in the treatment of vasomotor symptoms associated with menopause.
Estradot
A medicine used in the treatment of vasomotor symptoms associated with menopause.
Estragest
Medication used in the treatment of vasomotor symptoms associated with menopause. Based in oestradiol, norethisterone acetate. Produced by Novartis.
Estrapak
Medication used in the treatment of vasomotor symptoms associated with menopause.
Exelon
Medication used in the treatment of dementia of Alzheimer's Disease.
Electroretinogram
Electrooculogram
EOG. A test of the functional integrity of the Retinal Pigment Epithelium (RPE) – a layer of cells next to the retina of the eye. The EOG involves electrodes attached to the inner and outer corners of the eye and the patient is required to look back-and-forth between two small lights in a large white globe (ganzfeld) with bright lights on and off.
Endophthalmitis
An inflammation involving the internal parts of the eye – i.e., choroid, retina, ciliary body and iris. A very serious condition sometimes seen after an injury to the eye by a foreign object. Vision is severely threatened. Large doses of cortisone and antibiotics are often needed. May lead to the removal of the eye. Must be treated by an eye doctor ASAP.
Enucleation
An operation in which the whole eye and the front part of the optic nerve are removed. It is usually performed when the eye contains a tumor or is blind and very painful.
Esophoria
A tendency for an eye to turn inward a little bit. It occurs under certain conditions such as fatigue. An esophoria is sometimes uncovered by the cover test.
Esotropia
Commonly known as "crossed eyes". One eye is constantly turned inward toward the nose. In children, esotropia may lead to suppression of the visual signals from the eye to the brain and lead to amblyopia and decreased depth perception. In adults with previously straight eyes (for example after head trauma), esotropia causes constant double vision.
We thank you for using the Health Dictionary to search for Electroretinogram. If you have a better definition for Electroretinogram than the one presented here, please let us know by making use of the suggest a term option. This definition of Electroretinogram may be disputed by other professionals. Our attempt is to provide easy definitions on Electroretinogram and any other medical topic for the public at large.This dictionary contains 25007 terms. |
|
|
