What is the common indication for using an arterial line in critical care?

Using an arterial line in critical care is commonly indicated for frequent blood sampling. Arterial lines provide continuous blood pressure monitoring and easy access to arterial blood for laboratory analysis, such as measuring arterial blood gases (ABGs) and other blood tests. This capability is crucial in critical care settings where patients often require close monitoring of their physiological status and immediate assessment of metabolic and respiratory function.

While monitoring blood pressure can also be done non-invasively, an arterial line allows for real-time, continuous, and accurate blood pressure readings. Other options, such as preventing arterial thrombosis or reducing the risk of infection, do not accurately reflect the primary purpose of arterial lines. Instead, the emphasis is on their utility in facilitating immediate sampling and monitoring in rapidly changing clinical scenarios.