p.r.n.
Abbreviation meaning “when necessary” (from the Latin “pro re nata”, for an occasion that has arisen, as circumstances require, as needed).
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- p53
A specific protein with a mass of 53 kilodaltons that is produced by a tumor-suppressor gene. Like other tumor-suppressor genes, the p53 gene normally controls cell growth. If p53 is physically lost or functionally inactivated, cells can grow without restraint. Many human tumors have mutations in the gene coding for the p53 protein.
- PA (physician assistant)
PAs follow patients through their hospital course, their course of treatment in a clinic setting, etc. PAs can practice in virtually all medical and surgical specialties, provided they are properly trained and supervised. Thus, PAs can assist in surgeries. A PA must have at least a bachelor’s degree. Although there is not yet a requirement […]
- PA X-ray
An X-ray picture in which the beams pass from back-to-front (posteroanterior). As opposed to an AP (anteroposterior) film in which the rays pass through the body from front-to-back.
- PA-C
Physician Assistant – Certified.
- Pacemaker
A system that sends electrical impulses to the heart in order to set the heart rhythm. The pacemaker can be the normal “natural” pacemaker of the heart or it can be an electronic device. The natural pacemaker of the heart is the sinus node, one of the major elements in the cardiac conduction system, the […]