a catheter placed in an artery that measures the patientâ€™s blood pressure continuously.
An arterial line is a small, plastic-like tube (catheter) put into an artery in one of your wrists. This allows the doctors and nurses to monitor your blood pressure. It also allows the staff to withdraw blood so you will not have to be pricked for lab tests. Your arterial line is removed when you are ready to transfer to your room.
a thin tube inserted into a patient's artery, usually the radial artery, for purposes of monitoring blood pressure or drawing frequent arterial blood gases. This technique is only used in intensive care units or in the operating room.