A test in which the electrical potentials generated by the retina of the eye are measured when the retina is stimulated by light. Abbreviated ERG. In an ERG, an electrode is placed on the cornea at the front of the eye that 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. The instrument used to conduct ERG 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 at the same time top minimize and/or halt bleeding.
Elephantiasis: Lymphatic filariasis, a mosquito-borne parasitic disease caused by tiny thread-like worms that live in the human lymph system. Best known from dramatic photos of people with grossly enlarged or swollen arms and legs. The parasitic worms responsible for the disease include Wuchereria bancrofti, Brugia malayi, and B. timori. The disease currently affects 120 million […]
- Elevated hemidiaphragm
Elevated hemidiaphragm: Elevation of half of the diaphragm, the muscle that separates the chest cavity from the abdomen and that serves as the main muscle of respiration. The elevation of a hemidiaphragm is a significant sign of a problem. That problem may lie below, within or above the diaphragm: Below the diaphragm — In the […]
- Eleventh cranial nerve
Eleventh cranial nerve: The eleventh cranial nerve is the accessory nerve. The twelve cranial nerves, the accessory nerve included, emerge from or enter the skull (the cranium) as opposed to the spinal nerves which emerge from the vertebral column. The accessory is so-called because, although it arises in the brain, it receives an additional (accessory) […]
ELISA: Enzyme-linked immunosorbent assay, a rapid immunochemical test that involves an enzyme used for measuring a wide variety of tests of body fluids. ELISA tests detect substances that have antigenic properties, primarily proteins rather than small molecules and ions, such as glucose and potassium. Some of these substances include hormones, bacterial antigens, and antibodies. ELISA […]