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Medical Dictionary Definitions A-Z List

Medical Dictionary Definitions A - Z - «P»:

  1. Premature ventricular beat Premature ventricular beat
    Premature ventricular beat: See: Extrasystole. PVB...
  2. Premature ventricular contraction Premature ventricular contraction
    Premature ventricular contraction: PVC. A contraction of the lower chambers of the heart, the ventricles, which occur earlier than usual, because of abnormal electrical activity of the ventricles. The premature contraction is followed by a pause, as the heart electrical system "resets" its...
  3. Prematurity Prematurity
    Prematurity: 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 day of the Last Menstrual Period (LMP). ...
  4. Premenstrual Premenstrual
    Premenstrual: Just before the start of menstruation. As in a premenstrual headache....
  5. Premenstrual dysphoric disorder Premenstrual dysphoric disorder
    Premenstrual dysphoric disorder (PMDD): a severe form of the premenstrual syndrome (PMS). Both premenstrual syndrome and premenstrual dysphoric disorder are characterized by unpleasant physical and psychological symptoms (such as fatigue, mood changes, irritability, and abdominal bloating) that occu...
  6. Premenstrual syndrome Premenstrual syndrome
    Premenstrual syndrome: A combination of physical and mood disturbances that occur in the last half of a woman's menstrual cycle after ovulation and normally end with the onset of the menstrual flow. Physical features of the premenstrual syndrome (PMS) include breast tenderness and bloating. Psycholo...
  7. Premie Premie
    Premie: Short and slangy for a premature baby. A preterm infant. Also often spelled (for obscure reasons) preemie. ...
  8. Prenatal Prenatal
    Prenatal: Occurring or existing before birth. Prenatal care is the regular health care women should receive during pregnancy from an obstetrician or midwife. Prenatal development is the growth and development of a single-celled zygote formed by the combination of a sperm and an egg into a baby. Pre...
  9. Prenatal care Prenatal care
    Prenatal care: During pregnancy, women should receive regular health care from an obstetrician or midwife. Services needed include dietary and lifestyle advice, weighing to ensure proper weight gain, and examination for problems of pregnancy such as edema and preeclampsia (toxemia). In cases wh...
  10. Prenatal development Prenatal development
    Prenatal development: The process of growth and development within the womb, in which a single-cell zygote (the cell formed by the combination of a sperm and an egg) becomes an embryo, a fetus, and then a baby. The first two weeks of development are concerned with simple cell multiplication. Th...
  11. Prenatal diagnosis Prenatal diagnosis
    Prenatal diagnosis: Diagnosis before birth. Methods for prenatal diagnosis include ultrasound of the uterus, placenta, and/or developing fetus; chorionic villus sampling (CVS) to obtain tissue for chromosome or biochemical analysis; and amniocentesis to obtain amniotic fluid for the analysis of...
  12. Prenatal radiation exposure Prenatal radiation exposure
    Prenatal radiation exposure: The exposure of an unborn baby to radiation. Radiation exposure of the fetus can occur when the mother's abdomen is exposed to radiation from outside her body as, for example, by diagnostic X-rays. A pregnant woman may also be exposed to radiation by swallowing or breath...
  13. Prenatal surgery Prenatal surgery
    Prenatal surgery: The surgical treatment of the fetus before birth. Also called antenatal surgery or, most often, fetal surgery. Fetal surgery is done when the fetus is not expected to live long enough to make it through to delivery or to live long after birth unless fetal surgery is performed. For...
  14. Preop Preop
    Preop: Short for preoperative, before surgery. The opposite of preop is postop....
  15. Preoperative Preoperative
    Preoperative: Before surgery. As opposed to postoperative, after surgery....