Medical Dictionary Definitions A-Z List
Medical Dictionary Definitions A - Z - «P»:
Percentile: The percentage of individuals in a group who have
achieved a certain quantity (such as height, weight, and head circumference) or
developmental milestone (such as "walking well" the 50th percentile for which
is12 months of age). ...
Perception, auditory: The ability to identify, interpret, and attach meaning to sound....
Perchlorate: A chemical used as the primary ingredient of solid rocket propellant and in munitions beginning in the 1950s. Perchlorate is also used in the production of explosives and fireworks. It adds the blue color to firework displays. Perchlorate remains in use and is unregulated. For disposal,...
Perchloric acid: See: Perchlorate....
Percutaneous: Through the skin, as in a
Percutaneous endoscopic gastrostomy (PEG)
Percutaneous endoscopic gastrostomy
(PEG): A surgical procedure for placing a feeding
tube without having to perform an open laparotomy
(operation on the abdomen). The aim of PEG is to feed those
who cannot swallow. PEG may be done by a surgeon,
otolaryngologist (ENT specialist) or gastroent...
Percutaneous endoscopic jejunostomy
Percutaneous endoscopic jejunostomy: (PEJ) A surgical procedure for placing a feeding tube into the jejunum (part of the small intestine) without having to perform an open laparotomy (an operation opening the abdomen). The aim of PEJ is to feed a patient who cannot swallow. PEJ may be done by a surg...
Percutaneous liver biopsy
Percutaneous liver biopsy: A liver biopsy that is done through the skin with a needle. A percutaneous liver biopsy is in contrast, for example, to an open surgical biopsy of the liver. See: Liver biopsy....
Percutaneous nephrolithotripsy (PNL)
Percutaneous nephrolithotripsy (PNL): A technique for removing large and/or dense stones and staghorn stones.
PNL is done via a port created by puncturing the kidney through the skin and enlarging the access port to 1 cm (about 3/8 inch) in diameter. There is no surgical incision.
PNL is done unde...
Percutaneous transhepatic cholangiography
Percutaneous transhepatic cholangiography: See: Cholangiography, percutaneous transhepatic....
Percutaneous transluminal coronary angioplasty
Percutaneous transluminal coronary angioplasty: PTCA.
The use of a balloon-tipped catheter to enlarge a narrowed
Percutaneous umbilical blood sampling (PUBS)
Percutaneous umbilical blood sampling (PUBS): In PUBS, a needle is inserted through the mother's abdominal wall and the uterine wall. Blood can be withdrawn from the umbilical
vein at the point where the umbilical cord inserts (goes) into the
placenta. Blood may also be taken from the umbilical ve...
Perfect pitch: The inherent human ability to identify a note or sing it without hearing a reference note beforehand. Since most native speakers of languages that use tones to convey meaning have perfect pitch for language, it is now believed that babies are born with perfect pitch but lose it if the...
Perfluorinated acid: A type of chemical that repels water and oil and is resistant to heat and chemical stress. Perfluorooctanoic acid (PFOA) and other perfluorinated acids have been used in the manufacturing process of many products, including Teflon and Gore-Tex, and are used to make polymers for ...
Perfluorooctanoic acid: PFOA. See: Perfluorinated acid....