An arterial catheter is a thin, flexible tube inserted into an artery, typically in the wrist or groin. It is used to monitor blood pressure continuously and to obtain blood samples for testing. This device helps healthcare providers assess a patient's cardiovascular status and make informed decisions about treatment. The catheter is usually connected to a pressure transducer, which provides real-time readings of blood pressure. In some cases, it may also be used to deliver medications or fluids directly into the bloodstream. Proper placement and maintenance of the arterial catheter are essential to prevent complications such as infection or clotting.