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Vascular catheters designed for invasive measurement of blood pressure (BP) by means of a fluid-filled tube that is connected to an external fluid system, which includes a pressure transducer. The electric signal from the transducer is processed and the values of the maximum and minimum BP (i.e., systolic and diastolic pressures) are displayed; usually the monitor also displays the BP waveform (i.e., variation of pressure with time) and the mean pressure value using an algorithm. Hydraulic BP vascular catheters are used mainly during intensive care and surgical procedures.
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