Webster's New World Medical Dictionary

ichthyosis-keratitis-deafness syndrome
See
keratitis-ichthyosis-deafness syndrome.
ICSH
interstitial-cell-stimulating hormone (ICSH).
See 
luteinizing hormone.
ICSI
Intracytoplasmic sperm injection.
icterus
See 
jaundice.
ICU
Intensive care unit. The intensive care unit is
a designated area of a hospital facility that is dedi-
cated to the care of patients who are seriously ill.
ICU psychosis
A disorder in which patients in an
intensive care unit (ICU) or a similar hospital set-
ting experience anxiety, become paranoid, hear
voices, see things that are not there, become
severely disoriented in time and place, become very
agitated, or even become violent. ICU psychosis is a
form of acute brain failure (delirium). Organic fac-
tors, including dehydration, low blood oxygen
(hypoxia), heart failure, infection, and drugs can
cause or contribute to delirium. Other factors that
are believed to play into ICU psychosis are sensory
deprivation, sensory overload, pain (particularly if
poorly controlled), sleep deprivation, disruption of
the normal day–night rhythm, and the loss of con-
trol over their lives that patients often feel in an ICU.
Treatment of ICU psychosis depends on the cause.
ICU psychosis usually goes away when the patient
leaves the ICU.
ID
Intradermal.
IDDM
Insulin-dependent diabetes mellitus. See
diabetes, type 1.
idiocy, amaurotic familial
See 
Tay-Sachs 
disease.
idiopathic
See 
essential.
idiopathic
Of unknown cause. For example,
idiopathic pulmonary fibrosis is scarring of the lung
tissue without a known cause.
idiopathic hypertrophic subaortic stenosis
Narrowing of the left ventricle of the heart just
below the aortic valve through which blood must
pass on its way up into the aorta. The narrowing
cuts the flow of blood and is due to hypertrophic
cardiomyopathy (HCM), a genetic disorder of the
heart. HCM is the leading cause of sudden cardiac
death in preadolescent and adolescent children.
The hallmark of the HCM is abnormal enlargement
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of the left ventricle of the heart, but it frequently
involves the interventricular septum, which results
in an obstruction of flow through the left ventricular
outflow tract. Treatment options include drugs and
surgery. Abbreviated IHSS. See also 
subaortic
stenosis.