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Medical Dictionary Definitions A-Z List

Medical Dictionary Definitions A - Z - «T»:

  1. Translocation, reciprocal Translocation, reciprocal
    Translocation, reciprocal: A type of chromosome rearrangement involving the exchange of chromosome segments between two chromosomes that do not belong to the same pair of chromosomes. A specific reciprocal translocation might, for example, involve the swap of material between chromosomes 1 and 19....
  2. Translocation, Robertsonian Translocation, Robertsonian
    Translocation, Robertsonian: A relatively very common and medically significant type of chromosome rearrangement that is formed by fusion of the whole long arms of two acrocentric chromosomes (chromosomes with the centromere near the very end). One in about 900 babies is born with a Robertsonian tra...
  3. Transmissible spongiform encephalopathy Transmissible spongiform encephalopathy
    Transmissible spongiform encephalopathy: One of a number of progressive neurodegenerative disorders in animals and humans caused by similar uncharacterized agents that produce spongiform changes in the brain. Specific examples of transmissible spongiform encephalopathies include: In animals: scra...
  4. Transmission distortion Transmission distortion
    Transmission distortion: Distortion in the transmission of genes or chromosomes to the offspring, resulting in a significant difference from the Mendelian predictions. As a rule, the chance for a given gene or chromosome to be transmitted to a child is 1:1 or 50%. A number of biologic processes can...
  5. Transmission, perinatal Transmission, perinatal
    Transmission, perinatal: Transmission of a disease-causing agent (a pathogen) from mother to baby during the perinatal period, the period immediately before and after birth. The perinatal period is defined in diverse ways. Depending on the definition, it starts at the 20th to 28th week of gestat...
  6. Transmission, vertical Transmission, vertical
    Transmission, vertical: Transmission of a disease-causing agent (a pathogen) vertically from mother directly to baby during the perinatal period, the period immediately before and after birth. The perinatal period is defined in diverse ways. Depending on the definition, it starts at the 20th to...
  7. Transmyocardial laser revascularization Transmyocardial laser revascularization
    Transmyocardial laser revascularization: A procedure by which a physician uses a laser to make holes in the heart to relieve the pain of severe angina. Transmyocardial laser revascularization has been done from both the outside and inside of the heart. When done from the outside, a laser (carb...
  8. Transplant Transplant
    Transplant: The grafting of a tissue from one place to another, just as in botany a bud from one plant might be grafted onto the stem of another. The transplanting of tissue can be from one part of the patient to another (autologous transplantation), as in the case of a skin graft using the p...
  9. Transplant, bone marrow Transplant, bone marrow
    Transplant, bone marrow: See: Bone marrow transplant....
  10. Transplant, corneal Transplant, corneal
    Transplant, corneal: See: Corneal transplant....
  11. Transplant, hand and forearm Transplant, hand and forearm
    Transplant, hand and forearm: Transplantation of the hand and the forearm from one person (a deceased donor) to another (the recipient). In the first hand transplant, performed in Ecuador in 1964, the donor hand was rejected after two weeks. The first successful hand and forearm transplant was done ...
  12. Transplant, heart Transplant, heart
    Transplant, heart: See: Heart transplant....
  13. Transplant, kidney Transplant, kidney
    Transplant, kidney: See: Kidney transplant....
  14. Transplant, liver Transplant, liver
    Transplant, liver: See: Liver transplant....
  15. Transplant, lung Transplant, lung
    Transplant, lung: The first lung transplant was done by the American surgeon James Hardy (1918-) in 1964. ...