[Durgical](https://durgical.com/en/) › [DurgiPedia](https://durgical.com/en/durgipedia/) › [Nursing](https://durgical.com/en/nursing/) › [Procedures](https://durgical.com/en/nursing/areas/procedures/) › Recording a 12-lead ECG # Recording a 12-lead ECG - Procedure Ten electrodes on the limbs and chest record the heart's electrical activity; exact positions and a still, relaxed patient give a tracing that can be trusted. Updated Nov 12, 2026 ## Key points - V1: 4th intercostal space, right sternal border. V2: 4th intercostal space, left sternal border. - V3: midway between V2 and V4. V4: 5th intercostal space, midclavicular line. - V5: left anterior axillary line, level with V4. V6: midaxillary line, level with V4 and V5. - Clean, dry, hair-free skin and a patient lying still, relaxed and warm: movement and shivering cause artefact. - Label the tracing and report an abnormal pattern with symptoms at once: the automatic reading does not replace the clinician. ## What it is The 12-lead electrocardiogram records the heart's electrical activity from twelve views using ten electrodes: four on the limbs and six on the chest (V1 to V6). It is painless and sends no electricity into the body. Its value depends on technique: electrodes in the wrong place, oily or hairy skin, movement or shivering create false changes. The machine prints an automatic reading, but a qualified clinician must interpret the tracing, and an abnormal pattern in a patient with symptoms is an urgent finding. ## Indications - Chest pain or symptoms that may be cardiac. - Palpitations, fainting or breathlessness. - Baseline before procedures or treatments that affect the heart. - Electrolyte disorders and follow-up of known rhythm problems. ## Contraindications and precautions - There is no absolute contraindication; in an emergency the ECG must not delay care. - Ask about allergy to the electrode adhesive. - Note a pacemaker or implanted device on the request and the tracing. - Respect privacy: expose only what is needed and cover the patient afterwards. ## Equipment - ECG machine with paper or digital storage, checked and charged. - Ten electrodes within their expiry date. - Gauze or cloth to clean and dry the skin, and clippers if there is hair. - Screen, sheet, clean gloves if needed and a pen. ## Step by step (and why) - Check the order, identify the patient, ask about allergies and explain it is painless — reduces anxiety and movement. - Ensure privacy, lay the patient flat, expose the chest and enter the patient's data — the tracing stays identified. - Remove oil, moisture and hair at each site and check the electrode expiry date — good contact reduces artefact. - Place the four limb electrodes on the arms and legs as their labels show (RA, LA, RL, LL) — each has a fixed place. - Place V1 and V2 in the 4th intercostal space at the right and left sternal borders, as the protocol shows — exact placement. - Place V4 at the 5th space midclavicular, V3 between V2 and V4, then V5 and V6 level with V4 — standard views. - Ask the patient to stay still and breathe normally, and record — movement and talking create artefact. - Check quality and labels; repeat if there is artefact — a poor tracing can hide or simulate disease. - Remove electrodes, clean and check the skin, and hand the tracing to the clinician promptly — speeds a decision. ## Complications - Artefact from movement, shivering, poor contact or loose cables. - False changes from misplaced chest electrodes or swapped limb leads. - Skin irritation at the electrode sites. - Delayed treatment if an abnormal tracing is not shown to the clinician quickly. ## Next step: when to call for help - If the tracing looks abnormal, check consciousness, pulse, chest pain and breathlessness, and call for emergency help if needed. - Report chest pain during the recording and hand over the ECG at once. - Give every ECG to the treating clinician promptly, even when the automatic reading says normal. ## Test yourself Think of the answer, then tap the question to see it. ## Where are V1 and V2 placed? In the 4th intercostal space: V1 at the right sternal border and V2 at the left sternal border. ## Where is V4 placed, and how are V5 and V6 positioned? V4 in the 5th intercostal space at the midclavicular line; V5 on the anterior axillary line and V6 on the midaxillary line, both level with V4. ## Why must the patient lie still and warm during the recording? Because movement and shivering add artefact that can hide or imitate real changes. ## Can the nurse rely on the machine's automatic reading? No. The tracing must be interpreted by a qualified clinician, and an abnormal pattern with symptoms is reported at once. [Add to my cards (4)](https://durgical.app/estudiar/?add=/en/nursing/recording-a-12-lead-ecg/) ## Connections ## Related 2 - [Cardiac monitoring at the bedside: leads, alarms and rhythm changes to report](https://durgical.com/en/nursing/cardiac-monitoring-at-the-bedside-leads-alarms-and-rhythm-changes-to-report/) - [Recognising deterioration and calling the rapid response team](https://durgical.com/en/nursing/recognising-deterioration-and-calling-the-rapid-response-team/) [← All of nursing](https://durgical.com/en/nursing/) Educational content for students; it does not replace your institution's protocols, supervised clinical training or a prescriber's order. Dose-calculation examples use made-up numbers: they are educational, not a clinical order. Sources: [Nursing Advanced Skills, 7.7: Checklist - Obtain a 12-Lead ECG](https://med.libretexts.org/Bookshelves/Nursing/Nursing_Advanced_Skills_(OpenRN)/07%3A_Interpret_Basic_ECG/7.07%3A_Checklist-_Obtain_a_12-Lead_ECG) (Open RN (Chippewa Valley Technical College), LibreTexts, 2023); [Electrocardiogram: MedlinePlus Medical Encyclopedia](https://medlineplus.gov/ency/article/003868.htm) (MedlinePlus, US National Library of Medicine, 2026); [Nursing Advanced Skills, 7.2: Basic Concepts](https://med.libretexts.org/Bookshelves/Nursing/Nursing_Advanced_Skills_(OpenRN)/07%3A_Interpret_Basic_ECG/7.02%3A_Basic_Concepts) (Open RN (Chippewa Valley Technical College), LibreTexts, 2023). ## **Spotted a mistake?** We are always improving for the community. Tell us what is wrong and our team will review it. Report a mistake Representative model, for educational purposes only. --- Source: https://durgical.com/en/nursing/recording-a-12-lead-ecg/ License: CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Cite as: DurgiPedia (durgical.com), https://durgical.com/en/nursing/recording-a-12-lead-ecg/