Medical Dictionary Definitions A-Z List
Medical Dictionary Definitions A - Z - «Q»:
Qinghaosu: A Chinese herb (also called sweet wormwood) from which is extracted the antimalarial agent artemisinin....
QRS complex: The deflections in the tracing of the electrocardiogram (ECG or EKG), comprising the Q, R, and S waves, that represent the ventricular activity of the heart (the depolarization of the ventricles)....
QT syndrome, long
QT syndrome, long: An inherited defect in the heart rhythm. In the US alone, it is estimated that 4,000 children and young adults die yearly of the long QT syndrome. It is a common cause of sudden death among school athletes, as well as the cause of many unexplained drownings. The first sign may, un...
Quack: 1) A practitioner who suggests the use of substances
or devices for the prevention or treatment of disease that are
known to be ineffective.
2) A person who pretends to be able to diagnose or heal people, but is unqualified and incompetent....
Quackery: Deliberate misrepresentation of the ability of a
substance or device for the prevention or treatment of disease. We may think that the day
of patent medicines is gone but look around you and you will see them still. They appeal
to our desire to believe that every disease is curable or at l...
Quadrant: A quarter. For
example, the liver is in the right upper quadrant of the abdomen. ...
Quadriceps: Although the term "quadriceps" technically may refer to any four-headed muscle, it usually refers to
and is synonymous with the quadriceps muscle of the thigh, the large muscle that comes down the femur (the bone of the upper leg), goes over the patella (the kneecap) and anchors into th...
Quadriceps reflex: See: Knee jerk....
Quadriceps stretch: An exercise to stretch the quadriceps muscle, the large muscle in the front of the thigh.
To do this exercise, lie on your left
side, on the floor. Your hips should be lined up so that
the right one is directly above the left one. Rest your
head on a pillow or your left hand....
Quadriparesis: Weakness of all four limbs, both arms and both
legs, as for example from muscular dystrophy. ...
Quadriplegia: Paralysis of all four limbs, both arms and both
legs, as from a high spinal cord accident or stroke. ...
Quadriplegic: Pertaining to quadriplegia (paralysis of all four limbs -- both arms and both legs), as from a high spinal cord accident....
Qualified health claim
Qualified health claim: A claim authorized by the US Food and Drug Administration (FDA) that must be supported by
credible scientific evidence regarding a relationship between a substance
(specific food or food component) and a disease or health-related condition.
Both of these elements -- a subs...
Qualify: In medicine, to finish training. One of the first women to receive a medical degree (albeit pretending to be a man), James Miranda Barry qualified in medicine at the University of Edinburgh in 1812....
Qualitative: Having to do with quality. In contrast to
quantitative (which pertains to quantity, the amount)....