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An arterial line, or A-line, is a thin catheter inserted into an artery. It is most commonly used in intensive care medicine to monitor the blood pressure real-time (rather than by intermittent measurement), and to obtain samples for arterial blood gas measurements. It is not generally used to administer medication. An arterial line is usually inserted in the neck (carotid artery); but can also be inserted into the wrist (radial artery), elbow (brachial artery), groin (femoral artery), or foot (pedal artery).
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