Contraindication
Contraindication: A condition which makes a particular treatment or procedure potentially inadvisable. A contraindication may be absolute or relative.
An absolute contraindication is a situation which makes a particular treatment or procedure absolutely inadvisable. In children, for example, aspirin is almost always contraindicated because of the danger that aspirin will cause Reye syndrome.
A relative contraindication is a condition which makes a particular treatment or procedure possibly inadvisable. For example, X-rays in pregnancy are relatively contraindicated (because of concern for the developing fetus) unless the X-rays are absolutely necessary.
Contraindications often highlight the balance of risk versus benefit of a particular treatment or procedure.
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- Contralateral
Contralateral: Of or pertaining to the other side. The opposite of iposilateral (the same side). For example, a stroke involving the right side of the brain may cause contralateral paralysis of the left leg.
- Contrast
Contrast: Short for “contrast media.” Contrast media are X-ray dyes used to provide contrast, for example, between blood vessels and other tissue.
- Contrast nephropathy
Contrast nephropathy: A form of acute renal failure that starts soon after administration of contrast media (dye) for X-rays. The disorder usually runs a benign course and only rarely requires recourse to dialysis.
- Contrast sensitivity, visual
Contrast sensitivity, visual: The ability to perceive differences between an object and its background.
- Control (genetic)
Control (genetic): The control of gene expression. Genetic control may be on the transcriptional or translational level. Transcriptional control works by controlling the number of RNA transcripts of a region of DNA, indirectly controlling protein synthesis. Translational control of protein synthesis works by regulating the step of translating RNA into protein.