Medical Dictionary Definitions A-Z List
Medical Dictionary Definitions A - Z - «I»:
Ipecac: A naturally occurring
substance with multiple properties including the ability to
cause vomiting (emesis). Ipecac is derived from dried
roots of a bush called Uragoga ipecacuanha that is native
to Brazil. In the past, a sizable proportion of poison
exposures in the U.S. were treated w...
Ipsilateral: On the same side. A study of "ipsilateral breast tumor recurrence following lumpectomy and radiation therapy" pertains to cancer returning in the same breast as has been treated. A lesion in the right side of the brain may affect vision ipsilaterally, in the right eye.
The opposite of ...
IPT: Interpersonal therapy....
IPV: Inactivated polio vaccine. The polio virus in
IPV has been inactivated (killed). The inactivated polio vaccine
(IPV) is also called the Salk vaccine after the late American
physician-virologist Jonas Salk.
The vaccines available for vaccination against polio are the IPV
(inactivated polio va...
IQ: Abbreviation for intelligence quotient, an attempt to measure the intelligence of someone.
The IQ score is usually based upon the results of a written test. To calculate the IQ, the person's mental age (as determined by a test) is divided by their chronologic age and the result is multiplied by...
IRB: Institutional Review Board....
Iressa: Brand name for gefitinib, a drug that attaches to the epidermal growth factor receptor (EGFR) on the surfaces of cells . People with non-small-cell lung cancer who have a mutation in the gene for EGFR enjoy a rapid and often dramatic response to the drug. For more information, see: gefitini...
Iridectomy: The process of making a hole in the iris by surgically removing a full-thickness piece from the iris....
Iridectomy, peripheral: See Peripheral iridectomy....
Iridology: The practice of diagnosing disease by
examining the iris of the eye. Although some diseases do
affect the eye, iridology is not considered scientific
Iris: The iris is the circular, colored curtain of
the eye. Its opening forms
the pupil. The iris helps regulate the amount of light that enters
eye has a number of other key components. These include the cornea,
retina, macula, optic nerve and vitreous.
The cornea is ...
Iris melanoma: See: Intraocular melanoma....
Iris, speckled: Due to little
white (or lightly colored) spots that are slightly elevated
on the surface of the iris. These spots, arranged in a ring
concentric with the pupil, occur in normal children but are
far more frequent in Down's syndrome (trisomy 21). They
were described in 1924 by T...
Iritis: Inflammation of the iris. The iris is the
circular, colored curtain in the front of the visible of the eye. (The opening of the iris
forms the pupil.)...
Iron: An essential mineral. Iron is necessary for the
transport of oxygen (via hemoglobin in red blood cells) and for oxidation by cells (via
cytochrome). Deficiency of iron is a common cause of anemia. Food sources of iron include
meat, poultry, eggs, vegetables and cereals (especially those fortif...