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Medical Dictionary Definitions A-Z List

Medical Dictionary Definitions A - Z - «R»:

  1. Reinnervation Reinnervation
    Reinnervation: Restoration of nerve function after it has been lost. Reinnervation may occur spontaneously or be achieved by nerve grafting. The EMG (electromyogram) may show evidence of denervation with subsequent reinnervation in motor neuron diseases such as ALS (amyotrophic lateral sclerosis) be...
  2. Reinstein syndrome Reinstein syndrome
    Reinstein syndrome: A heritable syndrome characterized by eye disease (specifically, macular degeneration and inverse retinitis pigmentosa), progressive hearing loss, and hypogonadism. Inverse retinitis pigmentosa differs from the common form of retinitis pigmentosa in the absence of night blindness...
  3. Reiter syndrome Reiter syndrome
    Reiter syndrome: A chronic form of inflammatory arthritis wherein the following three conditions are combined: (1) arthritis; (2) inflammation of the eyes (conjunctivitis); and (3) inflammation of the genital, urinary or gastrointestinal systems.Reiter syndrome is a systemic rheumatic disease, me...
  4. Rejection Rejection
    Rejection: In transplantation biology, the refusal by the body to accept transplanted cells, tissues or organs. For example, a kidney transplanted may be rejected....
  5. Relapse Relapse
    Relapse: The return of signs and symptoms of a disease after a patient has enjoyed a remission. For example, after treatment a patient with cancer of the colon went into remission with no sign or symptom of the tumor, remained in remission for 4 years, but then suffered a relapse and had to be trea...
  6. Relapsing fever Relapsing fever
    Relapsing fever: An acute infection with recurrent episodes of fever caused by spirochetes of the genus Borrelia which are borne by ticks or lice. The relapsing nature of the fever is associated with the presence of antigenic variants. As an immune response develops to the predominant antigenic str...
  7. Relaxant Relaxant
    Relaxant: Something that relaxes, relieves, reduces tension. For example, a muscle relaxant is often administered during abdominal surgery to relax the diaphragm and keep it from moving during the surgery. ...
  8. Relaxin Relaxin
    Relaxin: A hormone produced during pregnancy that facilitates the birth process by causing a softening and lengthening of the cervix and the pubic symphysis (the place where the pubic bones come together). Relaxin also inhibits contractions of the uterus and may play a role in timing of delivery. Re...
  9. Release, carpal tunnel Release, carpal tunnel
    Release, carpal tunnel: A surgical procedure to relieve pressure exerted on the median nerve within the carpal tunnel (the carpal tunnel syndrome). The median nerve is pinched in the wrist as it passes through the carpal tunnel. The buildup of scar tissue inside the carpal tunnel leads to this p...
  10. Rem Rem
    Rem: In radiation, Roentgen equivalent for man, a roentgen (an international unit of X- or gamma-radiation) adjusted for the atomic makeup of the human body. In ophthalmology, rapid eye movement....
  11. REM sleep REM sleep
    REM sleep: REM sleep is the portion of sleep when there are rapid eye movements (REMs). Dreams occur during REM sleep. We typically have 3 to 5 periods of REM sleep per night. They occur at intervals of 1-2 hours and are quite variable in length. An episode of REM sleep may last 5 minutes or over...
  12. Remedy Remedy
    Remedy: Something that consistently helps treat or cure a disease. From the Latin "remedium" meaning that which heals again (and again). A remedy for a wound is also called a vulnerary....
  13. Remission Remission
    Remission: Disappearance of the signs and symptoms of cancer or other disease. When this happens, the disease is said to be "in remission." A remission can be temporary or permanent....
  14. Remission induction chemotherapy Remission induction chemotherapy
    Remission induction chemotherapy: See Induction therapy....
  15. Remodeling, chromatin Remodeling, chromatin
    Remodeling, chromatin: See: Chromatin remodeling....