Webster's New World Medical Dictionary

electrogastrogram
A test in which the electrical
current generated by the muscle of the stomach is
sensed and recorded in a manner very similar to
that of an electrocardiogram of the heart.
Abbreviated EGG. An EGG is performed by taping
electrodes to the skin on the upper abdomen over
the stomach. Recordings from the muscle are
stored and analyzed by a computer. An EGG is per-
formed to diagnose motility disorders of the stom-
ach, conditions that prevent the muscles of the
stomach from working normally.
electrolarynx
A battery-operated instrument that
makes a humming sound to help people who have
lost their larynx talk.
electrolysis
Permanent removal of body hair,
including the hair root, with an electronic device.
Although electrolysis is promoted as a permanent
process, many people find that hair does grow back
(albeit slowly) after electrolysis. Electrolysis may be
done by a dermatologist, by an electrolysis techni-
cian, or by a facial technologist or esthetician.
electrolyte
A substance that dissociates into ions
in solution and acquires the capacity to conduct
electricity. Sodium, potassium, chloride, calcium,
and phosphate are examples of electrolytes, infor-
mally known as lytes. Electrolyte replacement is
needed when a patient has prolonged vomiting or
diarrhea, and as a response to strenuous athletic
activity. Commercial electrolyte solutions are avail-
able, particularly for sick children (solutions such
as Pedialyte) and athletes (sports drinks, such as
Gatorade). Electrolyte monitoring is important in
treatment of anorexia and bulimia.
electromyogram
A test that records the electri-
cal activity of muscles. Normal muscles produce a
typical pattern of electrical current that is usually
proportional to the level of muscle activity. Diseases
of muscle and/or nerves can produce abnormal
electromyogram patterns. Abbreviated EMG. Also
known as a myogram.