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  • Plethysmographs designed for non-invasive measuring and recording data and graphics (i.e., a plethysmogram) of the volume and variations in volume of the lower limbs due to the presence and flow of blood in the vascular system based on the measurement of the volume waveform and amplitude. This technique is also known as segmental plethysmography, pulse volume recording (PVR) plethysmography, and pneumo plethysmography. These devices typically consist of a unit that measures, records, and displays the results (usually in graphic format) and compression cuffs, sensors (e.g., pressure, volume), transducers, and signal amplifiers. The sensors are applied to several points (e.g., thigh, calf, ankle) to measure pressure changes in the bladder of the cuff wrapped around the limb. These changes reflect changes in the cuff volume, which is a direct reflection of changes within the limb volume. Lower limb segmental plethysmographs are used to assess peripheral circulation and to assist in diagnosing diseases/disorders related to venous blood flow (e.g., deep venous thrombosis).
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