What is the term for a catheter placed into a vein and connected to a monitor?

The term for a catheter placed into a vein and connected to a monitor is known as a central venous access device. This type of device is specifically designed to provide reliable access to the central venous system for various medical purposes, such as administering medication, fluids, or nutritional support, as well as for monitoring central venous pressure.

Central venous access devices can be used for extended periods, allowing for continuous monitoring and treatment without the need for repeated venipunctures. This is crucial in managing patients who require long-term intravenous therapy or constant monitoring for their medical conditions.

While other devices might serve different purposes, such as an implanted port for long-term medication delivery or a Swan-Ganz catheter, which specifically measures pulmonary artery pressure, they do not encompass the broad definition of a catheter that is primarily used for connection to a monitoring system in the central venous access category. Thus, the classification of central venous access devices encompasses a wider range of related functionalities that align with the definition provided in the question.