An arterial line is used to?

An arterial line is used to?

• A. Assess oxygen saturation
• B. Measure BP and obtain blood samples
• C. Monitor intracranial pressure
• D. Deliver central venous nutrition

Answer: (B)

An arterial line is used for continuous, real-time arterial blood pressure monitoring and to obtain arterial blood samples for laboratory analysis, especially arterial blood gases. This setup lets clinicians see the exact blood pressure waveform beat by beat and draw ABGs without repeatedly needle-puncturing an artery, which is crucial in unstable patients, during surgery, or in the ICU. It’s not for assessing oxygen saturation directly—that job typically goes to a pulse oximeter, though ABGs can provide detailed oxygenation and gas information. It also isn’t used to monitor intracranial pressure (that requires a dedicated ICP monitor) or to deliver nutrition (that requires a central venous or other access line for parenteral nutrition).

An arterial line is used for continuous, real-time arterial blood pressure monitoring and to obtain arterial blood samples for laboratory analysis, especially arterial blood gases. This setup lets clinicians see the exact blood pressure waveform beat by beat and draw ABGs without repeatedly needle-puncturing an artery, which is crucial in unstable patients, during surgery, or in the ICU. It’s not for assessing oxygen saturation directly—that job typically goes to a pulse oximeter, though ABGs can provide detailed oxygenation and gas information. It also isn’t used to monitor intracranial pressure (that requires a dedicated ICP monitor) or to deliver nutrition (that requires a central venous or other access line for parenteral nutrition).