Common clinical methods to monitor arterial and venous pressures utilize a pressure transducer system that requires a fluid-filled system. Transducer catheters such as Millar catheters (see JPEG 10 on the Companion CD) monitor pressures directly from the tip of the catheter. A sensor (see JPEG 11 on the Companion CD) placed directly at the end of the catheter allows direct and constant measurement of pressures, thus eliminating the intrinsic inaccuracies of a fluid-filled system.
Transducer catheters are more accurate than conventional fluid-filled systems. Motion artifact is nearly eliminated, and the issues of overdamped and underdamped systems are not present. Accurate pressure readings can be obtained with the catheter at any height; readings are not affected by the height of the pressure transducer as in the conventional system. With transducer catheters, there is no time delay because pressure is monitored directly at the source. Compared to the conventional fluid system, transducer catheters have high fidelity (>10 MHz).
Was this article helpful?
This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.