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| This glossary contains: 19186 medical terms |
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Dwarfism, thanatophoric
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Dwarfism, thanatophoricA form of short-limbed (micromelic) dwarfism that usually causes death within the first few hours after birth. Thanatophoric dysplasia is due to a lethal mutation (change) in the same gene that produces achondroplasia, a familiar and far more common form of short-limbed dwarfism that is compatible with life.
RELATED TERMS--------------------------------------
Dwarfism
A deficiency of growth hormone resulting in short stature.
Death
1. The end of life. The cessation of life. (These common definitions of death ultimately depend upon the definition of life, upon which there is no consensus.) 2. The permanent cessation of all vital bodily functions. (This definition depends upon the definition of "vital bodily functions.") See: Vital bodily functions. 3. The common law standard for determining death is the cessation of all vital functions, traditionally demonstrated by "an absence of spontaneous respiratory and cardiac functions." 4. The uniform determination of death.
Dysplasia
An abnormality of growth.
Mutation
A change in DNA that alters a gene and thus the gene's product, leading in some cases to deformity or disease. Mutations can occur spontaneously during cell division or can be triggered by environmental stresses, such as sunlight, radiation, and chemicals.
Gene
1. A unit of DNA that carries information for the biosynthesis of a specific product in the cell. 2. Ultimate unit by which inheritable characteristics are transmitted to succeeding generations in all living organisms. Genes are contained by, and arranged along the length of, the chromosome. The gene is composed of deoxyribonucleic acid (DNA). Each chromosome of each species has a definite number and arrangement of genes, which govern both the structure and metabolic functions of the cells and thus of the entire organism.
Achondroplasia
An inherited form of short-limbed dwarfism.
SIMILAR TERMS--------------------------------------
Dwarf
Someone with dwarfism, which is now more correctly called short stature.
Dwarfism
A deficiency of growth hormone resulting in short stature.
Dwarfism, achondroplastic
A genetic disorder of bone growth, achondroplasia is the most common cause of short stature with disproportionately short limbs -- dwarfism with short arms and legs. There is a typically large head with prominence of the forehead (frontal bossing), underdevelopment (hypoplasia) of the midface with cheekbones that lack prominence, and a low nasal bridge with narrow nasal passages. The fingers are short and the ring and middle fingers diverge giving the hand a trident (three-pronged) appearance.
Dwarfism, pituitary
Dwarfism caused by a lack of growth hormone, usually due to malfunction of the pituitary gland. Children with growth hormone deficiency may grow normally for the first two to three years of life but they then fall behind their peers in height. They are normally proportioned. This is a key point. Treatment is with human growth hormone given in childhood. Also known as hypopituitary dwarfism, hypopituitarism, panhypopituitarism, and growth hormone deficiency.
PREVIOUS AND NEXT TERMS--------------------------------------
Dust mite
A tiny microscopic organism that is the primary cause of allergies related to house dust. The term "dust mite allergy" is a misnomer because it is the excretion of these mites to which people are allergic. Dust mites can therefore trigger allergic reactions even when dead.
DVT (deep vein thrombosis)
Blood clotting in the veins of the inner thigh or leg. In air travel, DVT is the "economy-class syndrome." Even in young, health travelers the long stretches immobilized in cramped seats in cabins with very low humidity set the stage for the formation of a thrombus (blood clot) in the lower leg. Blood clots can break off (as emboli) and makes their way to the lung where they have the potential of causing respiratory distress and respiratory failure.
Dwarf
Someone with dwarfism, which is now more correctly called short stature.
Dwarfism, achondroplastic
A genetic disorder of bone growth, achondroplasia is the most common cause of short stature with disproportionately short limbs -- dwarfism with short arms and legs. There is a typically large head with prominence of the forehead (frontal bossing), underdevelopment (hypoplasia) of the midface with cheekbones that lack prominence, and a low nasal bridge with narrow nasal passages. The fingers are short and the ring and middle fingers diverge giving the hand a trident (three-pronged) appearance.
Dwarfism, pituitary
Dwarfism caused by a lack of growth hormone, usually due to malfunction of the pituitary gland. Children with growth hormone deficiency may grow normally for the first two to three years of life but they then fall behind their peers in height. They are normally proportioned. This is a key point. Treatment is with human growth hormone given in childhood. Also known as hypopituitary dwarfism, hypopituitarism, panhypopituitarism, and growth hormone deficiency.
Dwarfism, thanatophoric
Dx
Abbreviation standing for diagnosis, the determination of the nature of a disease.
DXM
Dextromethorphan, a cough suppressant, sometimes misused as a recreational drug.
Dynacin
Brand name for minocycline.
Dynein
A family of microtubule motor proteins that derive energy from ATP (adenosine triphosphatase) activity. The dyneins also form arms on the outer tubules of cilia and flagella.
DYS
Symbol for familial dysautonomia or a prefix denoting an inability or lack of function, as in dyspraxia (lack of ability to adequately control muscle movements).
RELATED TERMS--------------------------------------
Dwarfism
A deficiency of growth hormone resulting in short stature.
Death
1. The end of life. The cessation of life. (These common definitions of death ultimately depend upon the definition of life, upon which there is no consensus.) 2. The permanent cessation of all vital bodily functions. (This definition depends upon the definition of "vital bodily functions.") See: Vital bodily functions. 3. The common law standard for determining death is the cessation of all vital functions, traditionally demonstrated by "an absence of spontaneous respiratory and cardiac functions." 4. The uniform determination of death.
Dysplasia
An abnormality of growth.
Mutation
A change in DNA that alters a gene and thus the gene's product, leading in some cases to deformity or disease. Mutations can occur spontaneously during cell division or can be triggered by environmental stresses, such as sunlight, radiation, and chemicals.
Gene
1. A unit of DNA that carries information for the biosynthesis of a specific product in the cell. 2. Ultimate unit by which inheritable characteristics are transmitted to succeeding generations in all living organisms. Genes are contained by, and arranged along the length of, the chromosome. The gene is composed of deoxyribonucleic acid (DNA). Each chromosome of each species has a definite number and arrangement of genes, which govern both the structure and metabolic functions of the cells and thus of the entire organism.
Achondroplasia
An inherited form of short-limbed dwarfism.
SIMILAR TERMS--------------------------------------
Dwarf
Someone with dwarfism, which is now more correctly called short stature.
Dwarfism
A deficiency of growth hormone resulting in short stature.
Dwarfism, achondroplastic
A genetic disorder of bone growth, achondroplasia is the most common cause of short stature with disproportionately short limbs -- dwarfism with short arms and legs. There is a typically large head with prominence of the forehead (frontal bossing), underdevelopment (hypoplasia) of the midface with cheekbones that lack prominence, and a low nasal bridge with narrow nasal passages. The fingers are short and the ring and middle fingers diverge giving the hand a trident (three-pronged) appearance.
Dwarfism, pituitary
Dwarfism caused by a lack of growth hormone, usually due to malfunction of the pituitary gland. Children with growth hormone deficiency may grow normally for the first two to three years of life but they then fall behind their peers in height. They are normally proportioned. This is a key point. Treatment is with human growth hormone given in childhood. Also known as hypopituitary dwarfism, hypopituitarism, panhypopituitarism, and growth hormone deficiency.
PREVIOUS AND NEXT TERMS--------------------------------------
Dust mite
A tiny microscopic organism that is the primary cause of allergies related to house dust. The term "dust mite allergy" is a misnomer because it is the excretion of these mites to which people are allergic. Dust mites can therefore trigger allergic reactions even when dead.
DVT (deep vein thrombosis)
Blood clotting in the veins of the inner thigh or leg. In air travel, DVT is the "economy-class syndrome." Even in young, health travelers the long stretches immobilized in cramped seats in cabins with very low humidity set the stage for the formation of a thrombus (blood clot) in the lower leg. Blood clots can break off (as emboli) and makes their way to the lung where they have the potential of causing respiratory distress and respiratory failure.
Dwarf
Someone with dwarfism, which is now more correctly called short stature.
Dwarfism, achondroplastic
A genetic disorder of bone growth, achondroplasia is the most common cause of short stature with disproportionately short limbs -- dwarfism with short arms and legs. There is a typically large head with prominence of the forehead (frontal bossing), underdevelopment (hypoplasia) of the midface with cheekbones that lack prominence, and a low nasal bridge with narrow nasal passages. The fingers are short and the ring and middle fingers diverge giving the hand a trident (three-pronged) appearance.
Dwarfism, pituitary
Dwarfism caused by a lack of growth hormone, usually due to malfunction of the pituitary gland. Children with growth hormone deficiency may grow normally for the first two to three years of life but they then fall behind their peers in height. They are normally proportioned. This is a key point. Treatment is with human growth hormone given in childhood. Also known as hypopituitary dwarfism, hypopituitarism, panhypopituitarism, and growth hormone deficiency.
Dwarfism, thanatophoric
Dx
Abbreviation standing for diagnosis, the determination of the nature of a disease.
DXM
Dextromethorphan, a cough suppressant, sometimes misused as a recreational drug.
Dynacin
Brand name for minocycline.
Dynein
A family of microtubule motor proteins that derive energy from ATP (adenosine triphosphatase) activity. The dyneins also form arms on the outer tubules of cilia and flagella.
DYS
Symbol for familial dysautonomia or a prefix denoting an inability or lack of function, as in dyspraxia (lack of ability to adequately control muscle movements).
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This dictionary contains 19186 terms.
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