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Arterial Line Placement

Front view of a male torso showing the heart and radial artery of the arm. A catheter is inserted into the radial artery.

An arterial line is a thin, flexible tube (catheter). It’s put into an artery (a blood vessel that carries oxygen-rich blood from your heart to the rest of your body). An arterial line makes it easy to check your blood pressure. This is needed during certain hospital procedures when your blood pressure may go up and down a lot.

Why is arterial line placement needed?

With an arterial line, your blood pressure can be checked at all times. This lets your healthcare provider know right away if your blood pressure quickly rises or drops. The line also lets your provider easily take many blood samples for testing. There is no need to stick you with a needle each time.

Using a standard inflatable blood pressure cuff may take too long to get such fast, frequent measurements. Standard blood pressure cuffs also may not be exact enough. There are times when precise blood pressure measurements are needed.

Placing the line

Placing the line takes about 15 minutes. The line may be placed into your wrist, arm, foot, or groin (the area where your belly joins your legs).

To place the line:

  • Blood flow through side branching arteries will be checked. This is done to make sure the arterial line will not block blood flow.  

  • The insertion site is cleaned.

  • Medicine (local anesthesia) is injected in your skin near the insertion site. This numbs the area so you don't feel pain.

  • A needle is inserted through your skin into the artery. The needle is used to guide the line into the artery. Once the line is in place, the needle is removed. The line is then taped or stitched (sutured) to your skin. This helps keep the line from being pulled out.

  • The site is covered with a bandage.

  • The line may be hooked up to a continuous flow saline line. This keeps it flushed and stops blood clots from forming inside the arterial line.

  • The arterial line will also be hooked up to a monitor. Your healthcare team can check the readings on the monitor.

After the procedure

A nurse will make sure the line is open and working properly. Tell the nurse if you feel pain. You can have pain medicine. The line will stay in place for as long as needed. In some cases, the line must be replaced after a certain number of days. Your activity may be limited at the site where the arterial line was placed. This helps stop the line from twisting or blocking the artery site. So if the arterial line is in your wrist, you may need to keep your wrist straight by using an arm board support. If the line is in your groin, you will have to stay in bed. You can’t lift the head of the bed too high. If you do, the tubing and artery may become blocked. The nurses will check your arterial line often for signs of good blood flow. This is to make sure there are no problems.

Tell your provider if you have any signs or symptoms of a blocked artery, such as:

  • Severe pain in your body below the arterial line

  • Cold feeling in an arm or leg below the arterial line

  • Unusual numbness or tingling in an arm or leg below the arterial line

Risks and possible complications of arterial line placement

All procedures have some risk. Possible risks of this procedure include:

  • Pain

  • Bleeding

  • Infection

  • Blood clots or air bubbles in the artery. This can block blood flow to your heart, brain, or other areas of your body.

  • Blocked line, or the line falling out

  • Sudden narrowing of the artery

  • A collection of blood (hematoma) at the insertion site

  • Damage to nerves or the artery

© 2000-2017 The StayWell Company, LLC. 780 Township Line Road, Yardley, PA 19067. All rights reserved. This information is not intended as a substitute for professional medical care. Always follow your healthcare professional's instructions.