|
Refraction, Ocular
|
D012029 |
[Refraction of LIGHT effected by the media of the EYE.
] |
|
Refractive Errors
|
D012030 |
[Deviations from the average or standard indices of refraction of the eye through its dioptric or refractive apparatus.
] |
|
Refractive Surgical Procedures
|
D054140 |
[Surgical procedures employed to correct REFRACTIVE ERRORS such as MYOPIA; HYPEROPIA; or ASTIGMATISM. These may involve altering the curvature of the CORNEA; removal or replacement of the CRYSTALLINE LENS; or modification of the SCLERA to change the axial length of the eye.
] |
|
Refractometry
|
D012031 |
[Measurement of the index of refraction (the ratio of the velocity of light or other radiation in the first of two media to its velocity in the second as it passes from one into the other).
] |
|
Refractory Period, Electrophysiological
|
D012032 |
[A continuous refractory state preventing repolarization that occurs when the nerve is being stimulated with high electrical frequencies and ends when the application of current stops.
, The period of time following the triggering of an ACTION POTENTIAL when the CELL MEMBRANE has changed to an unexcitable state and is gradually restored to the resting (excitable) state. During the absolute refractory period no other stimulus can trigger a response. This is followed by the relative refractory period during which the cell gradually becomes more excitable and the stronger impulse that is required to illicit a response gradually lessens to that required during the resting state.
] |
|
Refractory Period, Psychological
|
D012033 |
[A delayed response interval occurring when two stimuli are presented in close succession.
] |
|
Refrigeration
|
D012034 |
[The mechanical process of cooling.
] |
|
Refsum Disease
|
D012035 |
[An autosomal recessive familial disorder that usually presents in childhood with POLYNEUROPATHY; SENSORINEURAL HEARING LOSS; ICHTHYOSIS; ATAXIA; RETINITIS PIGMENTOSA; and CARDIOMYOPATHIES. (From Joynt, Clinical Neurology, 1991, Ch37, p58-9; Rev Med Interne 1996;17(5):391-8) This condition can be caused by mutation in the genes encoding peroxisomal phytanoyl-CoA hydroxylase or proteins associated peroxisomal membrane, leading to impaired catabolism of PHYTANIC ACID in PEROXISOMES.
] |
|
Refsum Disease, Infantile
|
D052919 |
[An early onset form of phytanic acid storage disease with clinical and biochemical signs different from those of REFSUM DISEASE. Features include MENTAL RETARDATION; SENSORINEURAL HEARING LOSS; OSTEOPOROSIS; and severe liver damage. It can be caused by mutation in a number of genes encoding proteins involving in the biogenesis or assembly of PEROXISOMES.
] |
|
Refugee Camps
|
D000073017 |
[Areas of shelter and protection for people who leave their own country or habitual residence to escape danger, persecution, or disaster.
] |
|
Refugees
|
D012036 |
[Persons fleeing to a place of safety, especially those who flee to a foreign country or power to escape danger, persecution, or economic distress in their own country or habitual residence.
] |
|
Refugium
|
D000068236 |
[Area in an environment in which a population of organisms can survive through a period of unfavorable conditions.
] |
|
Refusal to Participate
|
D045808 |
[Refusal to take part in activities or procedures that are requested or expected of an individual. This may include refusal by HEALTH PERSONNEL to participate in specific medical procedures or refusal by PATIENTS or members of the public to take part in clinical trials or health promotion programs.
] |
|
Refusal to Treat
|
D016079 |
[Refusal of the health professional to initiate or continue treatment of a patient or group of patients. The refusal can be based on any reason. The concept is differentiated from PATIENT REFUSAL OF TREATMENT see TREATMENT REFUSAL which originates with the patient and not the health professional.
] |
|
Refuse Disposal
|
D012037 |
[The discarding or destroying of garbage, sewage, or other waste matter or its transformation into something useful or innocuous.
] |
|
Regeneration
|
D012038 |
[The physiological renewal, repair, or replacement of tissue.
] |
|
Regenerative Endodontics
|
D000078483 |
[A dental specialty concerned with biologically-based procedures designed to physiologically replace damaged tooth structures, including dentin and root structures, as well as cells of the pulp-dentin complex.
] |
|
Regenerative Medicine
|
D044968 |
[A field of medicine concerned with developing and using strategies aimed at repair or replacement of damaged, diseased, or metabolically deficient organs, tissues, and cells via TISSUE ENGINEERING; CELL TRANSPLANTATION; and ARTIFICIAL ORGANS and BIOARTIFICIAL ORGANS and tissues.
] |
|
Regional Blood Flow
|
D012039 |
[The flow of BLOOD through or around an organ or region of the body.
] |
|
Regional Health Planning
|
D012040 |
[Planning for health resources at a regional or multi-state level.
] |
