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Asthenia
Asthenia Weakness. Lack of energy and strength. Loss of strength. The word asthenia is not much used in medicine today, although it is a prominent part of myasthenia, a loss of muscle strength, as in myasthenia gravis.
RELATED TERMS--------------------------------------
Asthenia
Weakness. Lack of energy and strength. Loss of strength. The word asthenia is not much used in medicine today, although it is a prominent part of myasthenia, a loss of muscle strength, as in myasthenia gravis.
Today
Today is a prescription or over-the-counter drug which is (or once was) approved in the United States and possibly in other countries. Active ingredient(s): nonoxynol-9.
Muscle
Tissue made up of bundles of long, slender cells that contract when stimulated.
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Asthenic
1. Weak. Lacking in strength. 2. Having a slender light body. Ectomorphic. See also: Lambert-Eaton myasthenic syndrome .
Asthma
Asthma is a chronic, inflammatory lung disease characterized by recurrent breathing problems. People with asthma have acute episodes or when the air passages in their lungs get narrower, and breathing becomes more difficult. Sometimes episodes of asthma are triggered by allergens, although infection, exercise, cold air and other factors are also important triggers.
Asthma susceptibility gene
One of the genes that predisposes a person to asthma. A new gene family that plays a major role in asthma susceptibility has been identified. This gene family located at chromosome 5q23-35 is called Tim or Tapr. It controls the development of airway hyperreactivity (and the T cell production of interleukin 4 and 13). TIM-1 is also the receptor of the hepatitis A virus. This may explain the fact that hepatitis A virus infection decreases the chance asthma will develop.
Asthma, exercise-induced
"Asthma that is ""triggered"" by vigorous physical activity. Exercise-induced asthma tends particularly to affect children and young adults (because of their high level of physical activity) but can occur at any age. Exercise-induced asthma is initiated by the process of respiratory heat exchange (the fall in airway temperature during rapid breathing followed by rapid reheating with lowered ventilation). The more heat transferred, the cooler the airways become, the more rapidly they rewarm, and the more the bronchi are narrowed. Exercise-induced asthma is common. People with chronic asthma can develop symptoms whenever they are exposed to a ""trigger"" of the asthma, such as a virus, pollen, dust, or cigarette smoke. About 80 to 90 percent of people who have chronic asthma have exercise-induced asthma. And about 35 to 40 percent of people with seasonal allergies also have exercise-induced asthma and symptoms worsen during the spring and fall. "
Asthmatic
1. Pertaining to asthma as, for example, asthmatic bronchitis. 2. A person with asthma.
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Assistive device
Any device that is designed, made, or adapted to assist a person perform a particular task. For examples, canes, crutches, walkers, wheel chairs, and shower chairs are all assistive devices.
Assistive technology
"This term may be used to mean an assistive device, but more commonly denotes some kind of electronic or computerized device that helps a disabled person to function more easily in the world. Examples of assistive technology include devices that allow people to control a computer with the mouth, keyboards that can ""speak"" for mute individuals, and closed captioning systems that help the hearing impaired enjoy television shows and videos."
Association
1. In dysmorphology (the study of birth defects), the nonrandom occurrence in two or more individuals of a pattern of multiple anomalies (birth defects) not known to be a malformation syndrome (such as Down syndrome), a malformation sequence (of events) or what is called a polytopic field defect (in which all of the defects are concentrated in one particular area of the body). An example of an association in dysmorphology is the VACTERL association of birth defects. 2. In genetics, the occurrence together of two or more characteristics more often than would be expected by chance alone. An example of association involves a feature on the surface of white blood cells called HLA (HLA stands for human leukocyte antigen). A particular HLA type, HLA type B-27, is associated with an increased risk for a number of diseases including ankylosing spondylitis. The extent of the association is enormous. Ankylosing spondylitis is 87 times more likely to occur in people with HLA B-27 than in the general population.
AST
1. Aspartate aminotransferase, an enzyme normally present in liver and heart cells. AST is released into blood when the liver or heart is damaged. The blood AST levels are thus elevated with liver damage (for example, from viral hepatitis) or with an insult to the heart (for example, from a heart attack). Some medications can also raise AST levels. AST is also known as serum glutamic oxaloacetic transaminase (SGOT). 2. Androgen suppression therapy. See: Androgen suppression.
Astatic seizure
See: Atonic seizure.
Asthenia
Asthenic
1. Weak. Lacking in strength. 2. Having a slender light body. Ectomorphic. See also: Lambert-Eaton myasthenic syndrome .
Asthma susceptibility gene
One of the genes that predisposes a person to asthma. A new gene family that plays a major role in asthma susceptibility has been identified. This gene family located at chromosome 5q23-35 is called Tim or Tapr. It controls the development of airway hyperreactivity (and the T cell production of interleukin 4 and 13). TIM-1 is also the receptor of the hepatitis A virus. This may explain the fact that hepatitis A virus infection decreases the chance asthma will develop.
Asthma, exercise-induced
"Asthma that is ""triggered"" by vigorous physical activity. Exercise-induced asthma tends particularly to affect children and young adults (because of their high level of physical activity) but can occur at any age. Exercise-induced asthma is initiated by the process of respiratory heat exchange (the fall in airway temperature during rapid breathing followed by rapid reheating with lowered ventilation). The more heat transferred, the cooler the airways become, the more rapidly they rewarm, and the more the bronchi are narrowed. Exercise-induced asthma is common. People with chronic asthma can develop symptoms whenever they are exposed to a ""trigger"" of the asthma, such as a virus, pollen, dust, or cigarette smoke. About 80 to 90 percent of people who have chronic asthma have exercise-induced asthma. And about 35 to 40 percent of people with seasonal allergies also have exercise-induced asthma and symptoms worsen during the spring and fall. "
Asthmatic
1. Pertaining to asthma as, for example, asthmatic bronchitis. 2. A person with asthma.
Astigmatic
Referring to astigmatism or a person with astigmatism, a common form of visual impairment in which part of an image is blurred, due to an irregularity in the curvature of the front surface of the eye, the cornea. The curve of the cornea is shaped more like an American football or a rugby ball rather than a normal spherical basketball. Light rays entering the eye there are not uniformly focused on the retina. Rays entering through the more-curved surface are focused before the rays coming through the less-curved surface. The light is focused clearly along one plane but is blurred along the other. The result is blurred vision at all distances. Only part of what you are looking at is in clear focus at any one time.
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