Medical Dictionary Definitions A-Z List
Medical Dictionary Definitions A - Z - «R»:
Research, controlled: A study that compared results
from a treated group and a control group. The control group may
receive no treatment, a placebo, or a different treatment. See also
blinded study, control group, double-blinded study....
Resect: To remove. Resect and excise are not synonymous. Excise implies total removal whereas resect need not. A surgeon may resect part or all of a tumor but if the surgeon excises the tumor, all of the tumor is removed. From the Latin resectus, from resecare, meaning to trim, prune, cut back....
Resectable: Able to be removed (resected) by surgery....
Resection: Surgical removal of part of an organ....
Resection, video-assisted: Surgery that is aided by the use of a video camera that projects and enlarges the image on a television screen. Also called video-assisted surgery....
Reservoir: 1. A place where something such as water is kept in reserve.
2. The part of a device in which something is kept in reserve or stored, as an Ommaya reservoir.
3. For an infectious agent, an animal, person, plant, soil, or other substance in which the agent normally abides. See: Reservoir o...
Reservoir of infection
Reservoir of infection: Any person, animal, plant, soil or substance in which an infectious agent normally lives and multiplies.
The reservoir typically harbors the infectious agent without injury to itself and serves as a source from which other individuals can be infected. The infectious agent pr...
Reservoir, Ommaya: A device implanted under the scalp that is used to deliver anticancer drugs to the cerebrospinal fluid, the fluid surrounding the brain and spinal cord. The device is named for the U.S. neurosurgeon Ayub Ommaya....
Resident: In medicine, a
physician who has finished medical school and internship and is now receiving training in a specialized area as, for example, surgery, internal medicine, pathology or radiology. Board certification in all medical and surgical specialties requires the satisfactory completion...
Something left behind. With residual disease, the disease has not been eradicated....
Resin, bile acid
Resin, bile acid: Bile acid resins are substances that
bind in the intestines with bile acids that contain cholesterol and
are then eliminated in the stool. The major effect of bile acid
resins is to lower LDL-cholesterol by about 10 to 20 percent. Small
doses of resins can produce useful redu...
Resistance: Opposition to something, or the
ability to withstand it. For example, some forms of
staphylococcus are resistant to treatment with
The ability of bacteria and other microorganisms to withstand an antibiotic to which they were once sensitive (and were once stalled or killed outright). Also called drug resistance....
Resistance, aspirin: See: Aspirin resistance....
Resistance, insulin: See: Insulin resistance....