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Medical Dictionary Definitions A-Z List

Medical Dictionary Definitions A - Z - «P»:

  1. Pregnancy-associated plasma protein A Pregnancy-associated plasma protein A
    Pregnancy-associated plasma protein A: Abbreviated as PAPPA or PAPP-A. A large zinc-binding protein that acts as an enzyme, specifically a metallopeptidase. The gene for PAPPA is in chromosome band 9q33.1. PAPPA has been used in prenatal genetic screening and studies of atherosclerosis. Women with l...
  2. Pregnant Pregnant
    Pregnant: The state of carrying a developing fetus within the body. The word "pregnant" comes from the Latin pre- meaning before + (g)natus meaning birth = before (giving) birth. The word "prenatal" has exactly the same origin....
  3. Prehypertension Prehypertension
    Prehypertension: A systolic pressure of 120 to 139 mm Hg or a diastolic pressure of between 80 and 89 mm Hg. Prehypertension is a precursor to chronic high blood pressure. Lifestyle changes are therefore recommended for anyone with prehypertension....
  4. Preleukemia Preleukemia
    Preleukemia: A condition in which the bone marrow does not produce enough blood cells. This condition may progress to become acute leukemia. Preleukemia also is called myelodysplastic syndrome or smoldering leukemia....
  5. Prelingual Prelingual
    Prelingual: Before the development of speech and language. "She showed that in prelingually deaf people (that is, those who had been born deaf or become deaf before the age of two or so), the auditory parts of the brain had not degenerated or atrophied." (From The Mind's Eye, by Oliver Sacks, The Ne...
  6. Premacular fibrosis Premacular fibrosis
    Premacular fibrosis: See: Macular pucker....
  7. Premalignant Premalignant
    Premalignant: Pertaining to tissue that is not yet malignant, but is poised to become malignant. Appropriate clinical and laboratory studies are designed to detect premalignant tissue while it is still in a premalignant stages. A large battery of techniques are generally available to remove or kil...
  8. Premature baby Premature baby
    Premature baby: A baby born before 37 weeks of gestation have passed. Historically, the definition of prematurity was 2500 grams (about 5 1/2 pounds) or less at birth. The current World Health Organization definition of prematurity is a baby born before 37 weeks of gestation, counting from the first...
  9. Premature beat Premature beat
    Premature beat: See: Extrasystole....
  10. Premature birth Premature birth
    Premature birth: A birth that takes place before 37 weeks of gestation have passed. Historically, the definition of prematurity was 2500 grams (about 5 1/2 pounds) or less at birth. The current World Health Organization definition of prematurity is a baby born before 37 weeks of gestation, counting ...
  11. Premature contraction Premature contraction
    Premature contraction: See: Extrasystole....
  12. Premature contraction of the heart Premature contraction of the heart
    Premature contraction of the heart: When a single heartbeat occurs earlier than normal. This phenomenon can be within normal limits or represent a medically significant arrhythmia. ...
  13. Premature ejaculation Premature ejaculation
    Premature ejaculation: Premature ejaculation is ejecting semen from the penis, usually accompanied by orgasm occurring sooner than a man wishes during sexual activity. Premature ejaculation is characterized by a lack of voluntary control over ejaculation that interferes with optimal sexual or psyc...
  14. Premature menopause Premature menopause
    ...
  15. Premature systole Premature systole
    Premature systole: See: Extrasystole....