Category: V
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Voorhees’ bag
An inflatable rubber bag formerly used for dilating the cervix uteri to induce and facilitate labor.
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Von Pirquet’s test
A diagnostic test for tuberculosis in which a small amount of tuberculin is applied to a scarified area of the skin of the arm. A positive reaction is seen if a pimply red eruption appears several days later at the site of inoculation.
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Von Graefe’s sign
The failure of the eyelid to move downward promptly with the eyeball; the lid moves tardily and jerkily. This sign is seen in exophthalmic goiter and is a common sign in thyroid eye disease.
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Volutrauma
A lung injury caused by excessively high tidal volumes during the use of mechanical ventilation.
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Voluptuous
To, arising from, or provoking, consciously or otherwise, sensual desire, usually applied to the female sex.
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Volumetric capnography
The plot of the expired partial pressure of carbon dioxide versus the expired tidal volume during a breath.
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Volumetric brain imaging
Measurement of the size of specific structures within the brain with magnetic resonance imaging or other devices. It is used to diagnose and identify brain diseases noninvasively. Atrophy of certain anterior brain structures is found in patients with frontotemporal dementia. In schizophrenia, the hippocampus and amygdala are reduced. Other findings have been demonstrated in depression,…
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Volumetric analysis
Quantitative analysis performed by the measurement of the volume of solutions or liquids.
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Volume rendering
The imaging of the surface elements, internal geometry, and components of a three-dimensional structure.
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Volume percent
The number of cubic centimeters (milliliters) of a substance (usually oxygen or carbon dioxide) contained in 100 ml of another substance (e.g., blood).