hereditary hemorrhagic telangiectasia

Hereditary Hemorrhagic Telangiectasia

Definition

Hereditary hemorrhagic telangiectasia is an inherited condition characterized by abnormal blood vessels which are delicate and prone to bleeding. Hereditary hemorrhagic telangiectasia is also known as Rendu-Osler-Weber disease.

Description

The term telangiectasia refers to a spot formed, usually on the skin, by a dilated capillary or terminal artery. In hereditary hemorrhagic telangiectasia these spots occur because the blood vessel is fragile and bleeds easily. The bleeding may appear as small, red or reddish-violet spots on the face, lips, inside the mouth and nose or the tips of the fingers and toes. Other small telangiectasias may occur in the digestive tract.Unlike hemophilia, where bleeding is caused by an ineffective clotting mechanism in the blood, bleeding in hereditary hemorrhagic telangiectasia is caused by fragile blood vessels. However, like hemophilia, bleeding may be extensive and can occur without warning.

Causes and symptoms

Hereditary hemorrhagic telangiectasia, an autosomal dominant inherited disorder, occurs in one in 50,000 people.Recurrent nosebleeds are a nearly universal symptom in this condition. Usually the nosebleeds begin in childhood and become worse with age. The skin changes begin at puberty, and the condition becomes progressively worse until about 40 years of age, when it stabilizes.

Diagnosis

The physician will look for red spots on all areas of the skin, but especially on the upper half of the body, and in the mouth and nose and under the tongue.

Treatment

There is no specific treatment for hereditary hemorrhagic telangiectasia. The bleeding resulting from the condition can be stopped by applying compresses or direct pressure to the area. If necessary, a laser can be used to destroy the vessel. In severe cases, the leaking artery can be plugged or covered with a graft from normal tissue.

Prognosis

In most people, recurrent bleeding results in an iron deficiency. It is usually necessary to take iron supplements.

Prevention

Hereditary hemorrhagic telangiectasia is an inherited disorder and cannot be prevented.

Resources

Organizations

American Medical Association. 515 N. State St., Chicago, IL 60612. (312) 464-5000. http://www.ama-assn.org.Association of Birth Defect Children. 3526 Emerywood Lane, Orlando, FL, 32806. (305) 859-2821.

Key terms

Autosomal dominant — A pattern of inheritance in which the dominant gene on any non-sex chromosome carries the defect.Chromosome — A threadlike structure in the cell which transmits genetic information.

telangiectasia

[tel-an″je-ek-ta´zhah] a vascular lesion formed by dilation of a group of small blood vessels. adj., adj telangiectat´ic. Superficial telangiectasias are sometimes seen in the normal newborn on the nape of the neck (stork bites) or on the upper eyelids or upper lip (flame nevi). They usually disappear within the first year of life.hereditary hemorrhagic telangiectasia an autosomal dominant vascular anomaly characterized by the presence of multiple small telangiectases of the skin, mucous membranes, gastrointestinal tract, and other organs associated with recurrent episodes of bleeding from affected sites and gross occult melena.spider telangiectasia vascular spider.

he·red·i·tar·y hem·or·rhag·ic tel·an·gi·ec·ta·si·a

[MIM*187300] a disease with onset usually after puberty, marked by multiple small telangiectases and dilated venules that develop slowly on the skin and mucous membranes; the face, lips, tongue, nasopharynx, and intestinal mucosa are frequent sites, and recurrent bleeding may occur; autosomal dominant inheritance, caused by mutation in the gene (ENG) encoding endoglin on chromosome 9q. Synonym(s): Rendu-Osler-Weber syndrome

hereditary hemorrhagic telangiectasia

n. A genetic disease characterized by multiple telangiectasias and arteriovenous malformations, resulting in bleeding in the skin, mucous membranes, and internal organs.

hereditary hemorrhagic telangiectasia

Osler-Rendu-Weber syndrome, Rendu-Osler-Weber syndrome Molecular hematology An AD condition characterized by telangiectases of mucocutaneous surfaces–tongue, nose, lips, hands, feet Clinical Episodic epistaxis in childhood, chronic GI hemorrhage, palmo-plantar, liver telangiectasias, and lung AV malformations; telangiectasias may be seen on spleen, brain and spinal cord; rupture of the thin-walled vessels may result in hemorrhage of varying severity Treatment Aminocaproic acid, an inhibitor of fibrinolysis. See Endoglin.

he·red·i·tar·y hem·or·rhag·ic tel·an·gi·ec·ta·si·a

(hĕr-edi-tar-ē hem-ŏ-rajik tel-anjē-ek-tāzē-ă) Disease with onset usually after puberty, marked by multiple small telangiectases and dilated venules that develop slowly on the skin and mucous membranes; the face, lips, tongue, nasopharynx, and intestinal mucosa are frequent sites, and recurrent bleeding may occur. Also called Rendu-Osler-Weber syndrome.

Rendu,

Henri Jules Louis Marie, French physician, 1844-1902. Rendu-Osler-Weber syndrome - a disease marked by multiple small telangiectases and dilated venules that develop slowly on the skin and mucous membranes. Synonym(s): hereditary hemorrhagic telangiectasia

he·red·i·tar·y hem·or·rhag·ic tel·an·gi·ec·ta·si·a

(hĕr-edi-tar-ē hem-ŏ-rajik tel-anjē-ek-tāzē-ă) [MIM*187300] Disease with onset usually after puberty, marked by multiple small telangiectases and dilated venules that develop slowly on the skin and mucous membranes; the face, lips, tongue, nasopharynx, and intestinal mucosa are frequent sites, and recurrent bleeding may occur.

单词	hereditary hemorrhagic telangiectasia
释义	DictionarySeetelangiectasia hereditary hemorrhagic telangiectasia hereditary hemorrhagic telangiectasia [hə′red·ə‚ter·ē ‚hem·ə′raj·ik tə¦lan·jē·ek′tā·zhə] (medicine) An inherited disease characterized by dilatation of groups of capillaries and a tendency to hemorrhage. Also known as Osler-Rendu-Weber disease. hereditary hemorrhagic telangiectasia Hereditary Hemorrhagic Telangiectasia Definition Hereditary hemorrhagic telangiectasia is an inherited condition characterized by abnormal blood vessels which are delicate and prone to bleeding. Hereditary hemorrhagic telangiectasia is also known as Rendu-Osler-Weber disease. Description The term telangiectasia refers to a spot formed, usually on the skin, by a dilated capillary or terminal artery. In hereditary hemorrhagic telangiectasia these spots occur because the blood vessel is fragile and bleeds easily. The bleeding may appear as small, red or reddish-violet spots on the face, lips, inside the mouth and nose or the tips of the fingers and toes. Other small telangiectasias may occur in the digestive tract.Unlike hemophilia, where bleeding is caused by an ineffective clotting mechanism in the blood, bleeding in hereditary hemorrhagic telangiectasia is caused by fragile blood vessels. However, like hemophilia, bleeding may be extensive and can occur without warning. Causes and symptoms Hereditary hemorrhagic telangiectasia, an autosomal dominant inherited disorder, occurs in one in 50,000 people.Recurrent nosebleeds are a nearly universal symptom in this condition. Usually the nosebleeds begin in childhood and become worse with age. The skin changes begin at puberty, and the condition becomes progressively worse until about 40 years of age, when it stabilizes. Diagnosis The physician will look for red spots on all areas of the skin, but especially on the upper half of the body, and in the mouth and nose and under the tongue. Treatment There is no specific treatment for hereditary hemorrhagic telangiectasia. The bleeding resulting from the condition can be stopped by applying compresses or direct pressure to the area. If necessary, a laser can be used to destroy the vessel. In severe cases, the leaking artery can be plugged or covered with a graft from normal tissue. Prognosis In most people, recurrent bleeding results in an iron deficiency. It is usually necessary to take iron supplements. Prevention Hereditary hemorrhagic telangiectasia is an inherited disorder and cannot be prevented. Resources Organizations American Medical Association. 515 N. State St., Chicago, IL 60612. (312) 464-5000. http://www.ama-assn.org.Association of Birth Defect Children. 3526 Emerywood Lane, Orlando, FL, 32806. (305) 859-2821. Key terms Autosomal dominant — A pattern of inheritance in which the dominant gene on any non-sex chromosome carries the defect.Chromosome — A threadlike structure in the cell which transmits genetic information. telangiectasia [tel-an″je-ek-ta´zhah] a vascular lesion formed by dilation of a group of small blood vessels. adj., adj telangiectat´ic. Superficial telangiectasias are sometimes seen in the normal newborn on the nape of the neck (stork bites) or on the upper eyelids or upper lip (flame nevi). They usually disappear within the first year of life.hereditary hemorrhagic telangiectasia an autosomal dominant vascular anomaly characterized by the presence of multiple small telangiectases of the skin, mucous membranes, gastrointestinal tract, and other organs associated with recurrent episodes of bleeding from affected sites and gross occult melena.spider telangiectasia vascular spider. he·red·i·tar·y hem·or·rhag·ic tel·an·gi·ec·ta·si·a [MIM187300] a disease with onset usually after puberty, marked by multiple small telangiectases and dilated venules that develop slowly on the skin and mucous membranes; the face, lips, tongue, nasopharynx, and intestinal mucosa are frequent sites, and recurrent bleeding may occur; autosomal dominant inheritance, caused by mutation in the gene (ENG) encoding endoglin on chromosome 9q. Synonym(s): Rendu-Osler-Weber syndrome hereditary hemorrhagic telangiectasia n. A genetic disease characterized by multiple telangiectasias and arteriovenous malformations, resulting in bleeding in the skin, mucous membranes, and internal organs. hereditary hemorrhagic telangiectasia Osler-Rendu-Weber syndrome, Rendu-Osler-Weber syndrome Molecular hematology An AD condition characterized by telangiectases of mucocutaneous surfaces–tongue, nose, lips, hands, feet Clinical Episodic epistaxis in childhood, chronic GI hemorrhage, palmo-plantar, liver telangiectasias, and lung AV malformations; telangiectasias may be seen on spleen, brain and spinal cord; rupture of the thin-walled vessels may result in hemorrhage of varying severity Treatment Aminocaproic acid, an inhibitor of fibrinolysis. See Endoglin. he·red·i·tar·y hem·or·rhag·ic tel·an·gi·ec·ta·si·a (hĕr-edi-tar-ē hem-ŏ-rajik tel-anjē-ek-tāzē-ă) Disease with onset usually after puberty, marked by multiple small telangiectases and dilated venules that develop slowly on the skin and mucous membranes; the face, lips, tongue, nasopharynx, and intestinal mucosa are frequent sites, and recurrent bleeding may occur. Also called Rendu-Osler-Weber syndrome. Rendu, Henri Jules Louis Marie, French physician, 1844-1902. Rendu-Osler-Weber syndrome* - a disease marked by multiple small telangiectases and dilated venules that develop slowly on the skin and mucous membranes. Synonym(s): hereditary hemorrhagic telangiectasia he·red·i·tar·y hem·or·rhag·ic tel·an·gi·ec·ta·si·a (hĕr-edi-tar-ē hem-ŏ-rajik tel-anjē-ek-tāzē-ă) [MIM*187300] Disease with onset usually after puberty, marked by multiple small telangiectases and dilated venules that develop slowly on the skin and mucous membranes; the face, lips, tongue, nasopharynx, and intestinal mucosa are frequent sites, and recurrent bleeding may occur. AcronymsSeeHHT
随便看	barbecuing barbed barbed broach barbed concertina wire barbed end barbedly barbedness barbed tape barbed tongue barbed tongues barbed tributary barbed wire barbed-wire grass barbel barbel (disambiguation) barbel fishing world barbell barbellate barbellately barbell curl barbell military press barbell portfolio barbell portfolios barbells barbell stategy