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Medical Dictionary Definitions A-Z List

Medical Dictionary Definitions A - Z - «P»:

  1. Pavlovian conditioning Pavlovian conditioning
    Pavlovian conditioning: The Russian physiologist Ivan Petrovich Pavlov (1848-1936) conditioned dogs to respond in what proved to be a predictable manner, for example, by first ringing a bell before feeding them and then simply ringing the bell upon which stimulus they would begin to salivate as ...
  2. Pax3 Pax3
    Pax3: One in a family of Pax genes involved in regulating embryonic development at the level of transcription. The Pax3 gene is on chromosome 2 in band q35. It encodes a DNA-binding transcription factor that is expressed in the early embryo. Mutation of Pax3 leads to Waardenburg syndrome with a wi...
  3. PCA PCA
    PCA: Commonly used abbreviation for patient-controlled analgesia. Analgesia simply means relief of pain. PCA is a method by which the patient controls the amount of pain medicine (analgesia) they receive. There are a number of different PCA systems. In the classic PCA system, the patient receives a...
  4. PCB PCB
    PCB: See: PCBs....
  5. PCBs PCBs
    PCBs: PolyChlorinated Biphenyls, a mixture of up to 209 chlorinated chemicals. Although PCBs are no longer produced in the US where they were once known under the trade name Aroclor, PCBs are still found in the environment. A number of adverse health effects have associated with exposure to PCBs. ...
  6. PCL (posterior cruciate ligament) PCL (posterior cruciate ligament)
    PCL (posterior cruciate ligament): The knee joint is surrounded by a joint capsule with ligaments strapping the inside and outside of the joint (collateral ligaments) as well as crossing within the joint (cruciate ligaments). These ligaments provide stability and strength to the knee joint. The p...
  7. PCO PCO
    PCO: 1. Abbreviation in medical records for "Patient complains of." 2. Abbreviation for polycystic ovary. See also: Polycystic ovarian syndrome....
  8. PCO disease PCO disease
    PCO disease: PCO stands for PolyCystic Ovarian. PCO disease is an hormonal problem that causes women various symptoms including: Irregular or no periods Acne Obesity, and Excess hair growth. All women with PCO have irregular or no menses. Women with PCO do not ...
  9. PCOS PCOS
    PCOS: Polycystic ovary syndrome....
  10. PCP PCP
    PCP: Pneumocystis carinii pneumonia. A parasitic infection of the lungs that is particularly common and life-threatening in immunosuppressed persons. Prophylaxis is available to prevent PCP....
  11. PCR (polymerase chain reaction) PCR (polymerase chain reaction)
    PCR (polymerase chain reaction): PCR (polymerase chain reaction) is a technique in molecular genetics that permits the analysis of any short sequence of DNA (or RNA) even in samples containing only minute quantities of DNA or RNA. PCR is used to reproduce (amplify) selected sections of DNA or RNA ...
  12. PCT PCT
    PCT: The abbreviation "PCT" stands for a number of things including porphyria cutanea tarda, literally, the late skin form of porphyria, a genetic photosensitive (light-sensitive) skin disease with onset in adult life with substances called uroporphyrins in the urine due to a deficiency of uroporphy...
  13. PDA PDA
    PDA: Patent ductus arteriosus....
  14. PDR PDR
    PDR: Physicians' Desk Reference (please see entry to Physicians' Desk Reference). PDR less frequently stands for "postdelivery room". ...
  15. Pea, jequirity Pea, jequirity
    Pea, jequirity: See: Abrin....