An AI generated podcast from T. Piehl's lecture notes. Fluid-filled monitoring systems are used to measure hemodynamic pressures, which are the forces involved in circulating blood throughout the body. These systems work by using a fluid-filled catheter connected to a pressure transducer, which converts the pressure into an electrical signal. The signal is then amplified and displayed on an oscilloscope or strip recorder. Errors in the system can lead to inaccurate pressure readings, and it's important to minimize lag in the fluid, reduce air bubbles, and ensure proper zeroing of the system to obtain accurate measurements.