The additional amount of air that a person could breathe in or out if he or she were not using the full capacity of their LUNGS. (See also LUNG VOLUMES.)
the extra volume of air that an individual could inhale or exhale when breathing to the limit of his or her capacity.
(FFR) a technique used to quantify the severity of a coronary artery narrowing. During *cardiac catheterization, a specialized wire is passed down the coronary artery to measure pressure. The ratio of the pressure measured downstream of the narrowing to the pressure measured upstream is derived (this ratio also applies to coronary flow). When the ratio is below a certain threshold, flow restriction by the narrowing is deemed to be significant and *percutaneous coronary intervention is likely to be beneficial.... fractional flow reserve
an apparent decrease in the visibility of a structure in a *cross-sectional imaging technique, such as CT or MRI, when either the thickness of the object is much less than that of the slice being used to make the image, or the object is only partially imaged within the slice. See artifact.... partial volume artifact
the amount of blood ejected from each ventricle on each contraction, which can be affected by medication, exercise, decreases in the volume of circulating blood, or heart anomalies. In a healthy adult, stroke volume is estimated at 70 ml.... stroke volume
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