How to Put ECG Leads on a Chest

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The EGC (electrocardiogram) is used to measure a patient’s heart’s electrical activity. The test is commonly used to check for many heart conditions, from coronary heart disease to a heart arrhythmia. If you’re a medical professional, you may find yourself needing to attach the 10 EGC leads to a patient’s chest. Out of the 10 leads, 6 are positioned on the patient’s chest, and 4 of the leads are set on the patient’s limbs. It’s important that you position the leads correctly since incorrect lead placement can cause improper diagnosis or result in incorrect analysis of the test.

Part 1
Part 1 of 3:

Preparing the Patient

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    ECG tests are always administered with the patient lying flat on their back. Not only does this position make it much easier to find the correct places to situate the ECG leads, but it also keeps the patient’s heart beating at its resting rate. [1] If you’re in a doctor’s office, just have the patient lay back on an examination table. [2]
    • If you’re giving an ECG test in a patient’s home, ask them to recline on their bed or couch.
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    Explain that you’re about to place 10 leads on the patient’s body to electrically monitor their heartbeat. [3] Clarify that the test will not hurt, but that the leads will need to remain in place on the skin for 3–5 minutes. Ask the patient to take a few deep breaths and completely relax. [4]
    • If the patient is female, they may feel more comfortable with a female doctor or nurse placing the ECG leads on their chest.
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    If the patient’s skin is dirty or oily, clean it with soap and water and dry with a towel before applying the ECG leads. Dirt and oil can interfere with the electrical signals from the leads. They’ll also have a much harder time sticking onto a dirty chest. If a patient has chest hair where the leads should be placed, you’ll need to shave off the hair. [5]
    • It’s also a good idea to either wash your own hands or put on a pair of latex gloves before putting on the ECG leads.
    • If you don’t have soap and water available, you can also use an alcohol cleaning pad to remove dirt and oil.
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Part 2
Part 2 of 3:

Positioning the Chest Leads

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    The leads used in an ECG exam are color coded. There will be a chart on the ECG packaging that lets you know which color corresponds with which lead. You have to put some of them on the chest. [6] The 6 chest leads are medically referred to as the “V” leads. They’re numbered V1 through V6, with V1 being the first lead applied and V6 being the last. [7]
    • The 4 leads that you’ll place on the patient’s arms and legs should also be color coded. They may be packaged separately from the torso leads to avoid confusion.
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    Set your fingers at the base of the patient’s throat and slide them slowly down until you feel the top of the sternum. Slide your fingers down across the sternum another 5–6 inches (13–15 cm) until you reach the sternum’s widest part. This is the angle of Louis. You’ll know you’ve arrived at the angle of Louis when until you feel a bony lump where the 2nd rib connects to the patient’s sternum. Knowing the location of the angle of Louis will help you position the ECG electrodes. [8]
    • Having the patient reclining makes it much easier to find the angle of Louis. If it helps, practice finding the angle of Louis on yourself a few times before you find it on a patient.
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    Move your fingers to the right of the angle of Louis. As your fingers slide right, you’ll feel a gap between the patient’s ribs. Slide your fingers down across 1 more rib until you come to the next gap between ribs. Place the first lead here. To set the lead, press it firmly into place. The leads are lightly adhesive and will stay in the location you put them. [9]
    • V1 should be located between the patient’s 4th and 5th ribs, counting down from the top.
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    Place your hand back onto the patient’s angle of Louis and this time slide your hand to the left. Find the gap between the patient’s ribs and, as with V1, slide your fingers down across 1 more rib. Set electrode V2 in that gap between ribs, as close to the patient’s sternum as possible. [10]
    • V2 should essentially mirror the placement of V1, but on the left side of the chest.
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    From where you just placed electrode V2, slide your fingers down 1 more rib until you can feel the space between 2 ribs again. Then, slide your fingers to the right (this will be going farther left from the patient’s point of view). Place V4 directly under the midpoint of the patient’s left clavicle, in the space between 2 ribs. [11]
    • The clavicle is the collarbone. It often slightly protrudes just below the patient’s neck.
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    Don’t worry about lining V3 up with a gap between ribs. In fact, on most patient’s bodies, it will sit directly over a rib. Just eyeball half of the distance between electrodes V2 and V4, and stick V3 in that position. [12]
    • If you’re working with a female patient, leads V3 through V6 will be positioned beneath—not on top of—the patient’s left breast.
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    Slide your fingers right along the gap between ribs. Follow the gap between the patient’s ribs where you placed V4. Move your fingers to the right (left, from the patient’s point of view) and follow the gap. Move your fingers until they’re directly beneath the beginning of the patient’s underarm. Press V5 into place here. [13]
    • In medical terminology, the underarm area is known as the axilla.
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    Continue moving your fingers to the right (the patient’s left) along the line of the gap between 2 ribs that you’ve been following. Keep moving until your fingers are directly beneath the center of the patient’s underarm. Place V6 there, still in the gap between the patient’s ribs. [14]
    • It’s a good idea to always position the chest leads before positioning the extremity electrodes. The chest electrodes are more important and they need to be much more precisely located.
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Part 3
Part 3 of 3:

Setting the Extremity Leads

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    Fix a lead on the patient’s arm on the shoulder about 2 inches (5.1 cm) below the patient’s clavicle. Press the lead firmly onto the patient’s skin to fix its position. [15]
    • If you can’t position the lead here for some reason (e.g., the patient has a skin lesion), place the lead higher up on the patient’s shoulder. You can also place it farther out away from their neck if necessary.
    • The lead for the right shoulder is usually white.
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    As on the right arm, this lead should fall about 2 inches (5.1 cm) below the clavicle. Place the lead at roughly the same location as you placed the lead on their right side to ensure that both arm leads give accurate readings. Press down firmly on the lead to fix it in place. [16]
    • If the patient has a defibrillator on their chest or has a pacemaker, do not place the ECG lead on the electrical device. Instead, move the lead 1 inch (2.5 cm) in any direction so it’s directly on top of the skin.
    • The lead that goes on the left shoulder is usually color-coded black.
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    You have quite a bit of leeway when sticking the leads onto a patient’s ankle, especially when compared with sticking them onto the patient’s chest. Aim to place the lead just below the patient’s ankle bone where there’s a fleshy patch. Avoid placing the lead directly over a bony part of the ankle. [17]
    • If the patient is wearing socks and shoes, ask the patient to remove them so you can put on the lead.
    • The right ankle lead typically has a green color.
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    Just like with the right ankle, position the lead on the ankle over a fleshy patch. If the patient has a very bony ankle, you could position the lead at the top of the patient’s instep. Make sure to position the lead on the left ankle in roughly the same position as on the right ankle. [18]
    • It’s more important that the leads be symmetrically positioned than they be on any exact location on the ankles.
    • The lead that goes on the left ankle tends to be red.
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Expert Q&A

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  • Question
    What is an ECG?
    Shervin Eshaghian, MD
    Board Certified Cardiologist
    Dr. Shervin Eshaghian is a Board Certified cardiologist and the owner of Beverly Hills Cardiology based in the Los Angeles, California metro area. Dr. Eshaghian has over 13 years of cardiology experience, including serving on the medical staff at Cedars-Sinai Medical Center. He holds a BS in Psycho-Biology from the University of California, Los Angeles (UCLA) and an MD from the Albert Einstein College of Medicine. Furthermore, Dr. Eshaghian completed an internship, residency, and fellowship at Cedars Sinai Medical Center, where he was awarded the Leo Rigler Outstanding Academic Achievement Award and the Elliot Corday Fellow of the Year Award.
    Shervin Eshaghian, MD
    Board Certified Cardiologist
    Expert Answer
    ECG is a simple test. For this, the doctor hooks up electrodes to the chest and arms of the patient. It gives a good reading of the electrical activity of the person.
    Thanks! We're glad this was helpful.
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  • Question
    What information can you get from an ECG?
    Shervin Eshaghian, MD
    Board Certified Cardiologist
    Dr. Shervin Eshaghian is a Board Certified cardiologist and the owner of Beverly Hills Cardiology based in the Los Angeles, California metro area. Dr. Eshaghian has over 13 years of cardiology experience, including serving on the medical staff at Cedars-Sinai Medical Center. He holds a BS in Psycho-Biology from the University of California, Los Angeles (UCLA) and an MD from the Albert Einstein College of Medicine. Furthermore, Dr. Eshaghian completed an internship, residency, and fellowship at Cedars Sinai Medical Center, where he was awarded the Leo Rigler Outstanding Academic Achievement Award and the Elliot Corday Fellow of the Year Award.
    Shervin Eshaghian, MD
    Board Certified Cardiologist
    Expert Answer
    By looking at an ECG, you can know if someone is having any arrhythmias, irregular heart rhythms, or slow heart rhythms, such as heart block.
    Thanks! We're glad this was helpful.
    Thank you for your feedback.
    If wikiHow has helped you, please consider a small contribution to support us in helping more readers like you. We’re committed to providing the world with free how-to resources, and even $1 helps us in our mission. Support wikiHow
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      Tips

      • When you’re putting the chest leads on either men or women, do not use the nipples as a reference point. Nipple location can vary from person to person and so they’re not a reliable reference to use when position ECG leads. [19]
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      • Although the ECG test is referred to as a 12-electrode test, there are only 10 leads. 2 of the leads contain 2 electrodes each.
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      • Use a new ECG test kit on every patient. Each of the leads is stored in a small plastic sack, which is filled with adhesive gel. The gel helps the ECG lead stay in place on the patient’s skin.
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      Warnings

      • If a patient has an injury or lesion on their skin, do not place an ECG lead over it. Instead, place the lead as near to its intended location as possible but on healthy, unbroken skin.
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      • If an ECG lead is incorrectly positioned by as little as 20–25 millimetres (0.79–0.98 in), it can result in a clinically significant misreading of the test. [20]
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      References

      1. ↑ https://www.ausmed.com/cpd/articles/ecg-lead-placement
      2. ↑ Shervin Eshaghian, MD. Board Certified Cardiologist. Expert Interview. 26 June 2020.
      3. ↑ Shervin Eshaghian, MD. Board Certified Cardiologist. Expert Interview. 26 June 2020.
      4. ↑ https://www.ausmed.com/cpd/articles/ecg-lead-placement
      5. ↑ https://www.ausmed.com/cpd/articles/ecg-lead-placement
      6. ↑ Shervin Eshaghian, MD. Board Certified Cardiologist. Expert Interview. 26 June 2020.
      7. ↑ https://www.nottingham.ac.uk/nursing/practice/resources/cardiology/function/chest_leads.php
      8. ↑ https://www.nottingham.ac.uk/nursing/practice/resources/cardiology/function/chest_leads.php
      9. ↑ https://www.nottingham.ac.uk/nursing/practice/resources/cardiology/function/chest_leads.php
      1. ↑ https://www.nottingham.ac.uk/nursing/practice/resources/cardiology/function/chest_leads.php
      2. ↑ https://www.nottingham.ac.uk/nursing/practice/resources/cardiology/function/chest_leads.php
      3. ↑ https://www.nottingham.ac.uk/nursing/practice/resources/cardiology/function/chest_leads.php
      4. ↑ https://www.nottingham.ac.uk/nursing/practice/resources/cardiology/function/chest_leads.php
      5. ↑ https://www.nottingham.ac.uk/nursing/practice/resources/cardiology/function/chest_leads.php
      6. ↑ https://youtu.be/vuECTcOXH74?t=176
      7. ↑ https://youtu.be/vuECTcOXH74?t=181
      8. ↑ https://youtu.be/--TZxs58j24?t=54
      9. ↑ https://youtu.be/--TZxs58j24?t=56
      10. ↑ https://www.cablesandsensors.com/pages/12-lead-ecg-placement-guide-with-illustrations
      11. ↑ https://www.ausmed.com/cpd/articles/ecg-lead-placement

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