Medical Dictionary Definitions A-Z List
Medical Dictionary Definitions A - Z - «M»:
Myeloproliferative disorders: Malignant
diseases of certain bone marrow cells including those
that give rise to the red blood cells, the granulocytes (types of
white blood cells), and the platelets (crucial to blood clotting).
The myeloproliferative disorders include myelophthisic anemia,
MYH: A base excision repair gene responsible for an hereditary colon cancer syndrome. MYH is located on the short (p) arm of chromosome 1 in region 1p34.3-p32.1. MYH encodes an enzyme that removes the base adenine from mispairs (with 8-oxoguanine) that arise during the replication of oxidized DNA. M...
MYH syndrome: See: MYH....
Myo- (prefix): A prefix denoting a relationship to muscle.
Myo- enters into many words and terms in medicine including cardiomyopathy, dermatomyositis, electromyography, leiomyoma, myocardial infarction, myocarditis, myocardium, myoclonic, myocyte, myopathy, myoglobin, myometrium, myotonia, myotoni...
Myocardial bridge: Literally a bridging of heart
muscle over one of the major arteries to the heart (usually
the left anterior descending artery). The heart has formed
in this abnormal design from birth, whereby the artery is
actually 'tunneled' through a part of the heart muscle....
Myocardial infarction: A heart attack. Abbreviated MI.
The term "myocardial infarction" focuses on the myocardium (the heart muscle) and the changes that occur in it due to the sudden deprivation of circulating blood. The main change is necrosis (death) of myocardial tissue.
The word "infarction" ...
Myocardial infarction, acute
Myocardial infarction, acute: See: Acute myocardial infarction....
Myocarditis: Inflammation of the myocardium, the heart muscle.
Myocarditis can be caused by a number of different conditions. The most common cause is infection of the heart muscle by a virus. The virus causes the initial heart muscle inflammation. After the initial viral infection subsides, the bod...
Myocarditis, viral: Inflammation of the muscles in the walls of the heart due to a viral infection. Among the offenders are dozen of different common viruses, including the
echoviruses, and influenza viruses. Destruction of the heart muscle cells may lead t...
Myocardium: The heart muscle. ...
Myoclonic seizure: A seizure characterized by
jerking (myoclonic) movements of a muscle or muscle group,
without loss of consciousness....
Myoclonic twitch: A rapid, involuntary muscle
contraction, particularly near the eye. Myoclonic tics
resemble, and may be mistaken for, tics. Like tics, they
tend to occur more often when the person is under stress;
unlike tics, they are not preceded by any sensation and
they cannot be delayed....
Myoclonus: A condition of abnormal contraction of
muscles or portions of muscles. ...
Myocyte: A muscle cell. From myo-, muscle + -cyte, cell = muscle cell.
"Remaining young at heart is a desirable but elusive goal. Unbeknown to us, however, myocyte regeneration may accomplish just that." (Nature 415, 240, 2003)...
Myocyte, cardiac: See: Cardiac myocyte....