An arterial catheter is a thin, flexible tube inserted into an artery, typically in the wrist or groin. It allows for continuous monitoring of blood pressure and can be used to draw blood for tests. This device is essential in critical care settings, where precise measurements are crucial for patient management. The catheter is usually placed by a trained healthcare professional using a technique called arterial line placement. Once in place, it provides real-time data about a patient's cardiovascular status, helping doctors make informed decisions about treatment and interventions.