post-traumatic stress disorder A psychological disorder that develops in some individuals who have had major traumatic experiences, such as those who have experienced serious accidents, survived or witnessed violent crimes, or been through wars. Abbreviated PTSD. Typically a person with PTSD is emotionally numb at first but later has symptoms that may include depression, excessive…
postulates, Koch See Koch postulates.
postural Pertaining to the posture or position of the body, the attitude or carriage of the body as a whole, or the position of the limbs (the arms and legs). See also hypotension, orthostatic.
postural hypotension See hypotension, orthostatic.
potassium The major positive ion (cation) found inside cells. The chemical notation for potassium is K+. The proper level of potassium is essential for normal cell function. An abnormal increase in potassium (hyperkalemia) or decrease in potassium (hypokalemia) can profoundly affect the nervous system and heart, and when extreme, can be fatal. The normal blood…
Pott’s disease See tuberculous diskitis.
pouch of Douglas An extension of the peritoneal cavity between the rectum and the back wall of the uterus. Also known as the rectouterine pouch.
pouch, rectouterine See pouch of Douglas.
pound A measure of weight that is equal to 16 ounces or, metrically, 453.6 grams. Abbreviated lb.
power of attorney, durable See durable power of attorney.
PPMA Postpolio muscular atrophy.
PPS Postpolio syndrome.