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Medical Dictionary Definitions A-Z List

Medical Dictionary Definitions A - Z - «H»:

  1. Hirudotherapy Hirudotherapy
    Hirudotherapy: The use of leeches for medical therapy. Sometimes referred to as the "treatment that sucks." From hirudin, the active principle in the salivary secretion of leeches that acts as a potent anticoagulant (bloodthinner)....
  2. His His
    His: Histidine. See also: Amino acid symbols....
  3. His disease His disease
    His disease: This is a parasite (louse-borne) disease that was first recognized in the trenches of World War I and so was called trench fever. It is estimated to have affected more than a million people in Russia and on the war fronts in Europe. Trench fever was again a major problem in the military...
  4. His-Werner disease His-Werner disease
    His-Werner disease: This is a parasite (louse-borne) disease that was first recognized in the trenches of World War I and so was called trench fever. It is estimated to have affected more than a million people in Russia and on the war fronts in Europe. Trench fever was again a major problem in the m...
  5. Histamine Histamine
    Histamine: Substance that plays a major role in many allergic reactions. Histamine dilates blood vessels and makes the vessel walls abnormally permeable. ...
  6. Histamine cephalalgia Histamine cephalalgia
    Histamine cephalalgia: A distinctive syndrome of headaches, also known as cluster headache or migrainous neuralgia. The common pattern of cluster headache is termed "episodic" and is characterized by 1-3 short attacks of pain each day around the eyes, clustered over a stretch of 1-2 months, f...
  7. Histidine Histidine
    Histidine: An amino acid, one of the 20 building blocks of protein. An essential amino acid, histidine is present in many proteins. Histidine is elevated in the blood and urine in a genetic condition called histidinemia. Decarboxylation of histidine results in the formation of histamine. Symbol: His...
  8. Histiocyte Histiocyte
    Histiocyte: A type of white blood cell, also called a macrophage, that is created by the bone marrow. They usually stay in place, but when histiocytes are stimulated by infection or inflammation they become active, attacking bacteria and other foreign matter in the body. See also histiocytosis....
  9. Histiocytic necrotizing lymphadenitis Histiocytic necrotizing lymphadenitis
    Histiocytic necrotizing lymphadenitis: A disorder, also called Kikuchi disease, that typically causes "swollen glands" in the neck (cervical lymphadeniopathy) together with fever or flu-like symptoms. Laboratory test abnormalities include elevated erythrocyte sedimentation rate (ESR), and white blo...
  10. Histiocytosis Histiocytosis
    Histiocytosis: A rare but potentially deadly disorder with similarities to cancer, in which histiocytes start to multiply and attack the person's own tissues or organs. The result can be tissue damage, pain, development of tumor-like lumps called granulomas, fatigue, and other symptoms. If hist...
  11. Histiocytosis X Histiocytosis X
    Histiocytosis X: Now called Langerhans cell histiocytosis. This disease is subclassified into eosinophilic granuloma, Letterer Siwe disease, and Hand-Schuller-Christian disease....
  12. Histiocytosis, Hand-Schuller-Christian Histiocytosis, Hand-Schuller-Christian
    Histiocytosis, Hand-Schuller-Christian: A disease in which histiocytes start to multiply and attack the tissues or organs of the patient. The disease usually affects children age 2 to 5, less often older children and adults. The most frequent sites of bony involvement are the flat bones of the sk...
  13. Histiocytosis, Langerhans cell Histiocytosis, Langerhans cell
    Histiocytosis, Langerhans cell: Histiocytosis in which the active histiocytes normally occur in the skin. See histiocytosis....
  14. Histiocytosis, Letterer Siwe Histiocytosis, Letterer Siwe
    Histiocytosis, Letterer Siwe: A severe disease in which histiocytes start to multiply and attack the tissues or organs of the patient starting in infancy with a scaly, sometimes itchy rash on the scalp, ears, abdomen, and creases of the neck and face. Raw skin may provide a portal of entry for germs...
  15. Histiocytosis, lipid Histiocytosis, lipid
    Histiocytosis, lipid: A form of histiocytosis that affects lipid (fat) storage. Also known as Niemann- Pick disease, Erdheim-Chester disease....