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take (often effectively a noun meaning "prescription"—medical prescription or prescription drug) rep. repetatur: let it be repeated s. signa: write (write on the label) s.a. secundum artem: according to the art (accepted practice or best practice) SC subcutaneous "SC" can be mistaken for "SL," meaning sublingual. See also SQ: sem. semen seed ...
The instantaneous wave-free ratio (iFR, sometimes referred to as the instant wave-free ratio or instant flow reserve) is a diagnostic tool used to assess whether a stenosis is causing a limitation of blood flow in coronary arteries with subsequent ischemia. iFR is performed during cardiac catheterisation (angiography) using invasive coronary pressure wires which are placed in the coronary ...
The respiratory quotient (RQ) is the ratio: RQ = CO 2 eliminated / O 2 consumed. where the term "eliminated" refers to carbon dioxide (CO 2) removed from the body in a steady state. In this calculation, the CO 2 and O 2 must be given in the same units, and in quantities proportional to the number of molecules.
If one were to consider humidified air (with less oxygen), then the ideal v/q ratio would be in the vicinity of 1.0, thus leading to concept of ventilation-perfusion equality or ventilation-perfusion matching. This matching may be assessed in the lung as a whole, or in individual or in sub-groups of gas-exchanging units in the lung.
For example, a hazard ratio of 2 is thought to mean that a group has twice the chance of dying than a comparison group. In the Cox-model, this can be shown to translate to the following relationship between group survival functions : S 1 ( t ) = S 0 ( t ) r {\displaystyle S_{1}(t)=S_{0}(t)^{r}} (where r is the hazard ratio). [ 4 ]
Reference ranges (reference intervals) for blood tests are sets of values used by a health professional to interpret a set of medical test results from blood samples. Reference ranges for blood tests are studied within the field of clinical chemistry (also known as "clinical biochemistry", "chemical pathology" or "pure blood chemistry"), the ...
As an exception for the normal compression-to-ventilation ratio of 30:2, if at least two trained rescuers are present and the victim is a child, the preferred ratio is 15:2. [30]: 8 Equally, in newborns, the ratio is 30:2 if one rescuer is present, and 15:2 if two rescuers are present (according to the AHA 2015 Guidelines). [5]:
Sometimes the term safety ratio is used, particularly when referring to psychoactive drugs used for non-therapeutic purposes, e.g. recreational use. [10] In such cases, the effective dose is the amount and frequency that produces the desired effect, which can vary, and can be greater or less than the therapeutically effective dose.