ECG Leads:
- Body act as a conductor of electricity; the recording electrodes in the arms, legs, and chest wall show the differences in voltage (potential) among electrodes
- Different views of the same event leads to different ECG patterns
ECG Limb Leads:
- 6 Limb leads (extremity leads) and 6 chest (precordial)
- 3 bipolar limb leads: I, II, III
- 3 augmented unipolar: aVR, aVL, and aVF
- 6 precordial leads: V1-V6
Einthoven’s Triangle:
Lead I: LA - RA
Lead II: LL - RA
Lead III: LL - LA
Remember: Lead I + Lead III = Lead II
Should double check if the R-lead in lead II = sun of the R-waves in lead I and lead III (1 + 3 = 2)
ECG Leads:
- Unipolar leads record the electrical voltage at one location relative to an electrode with close to 0 potential
- aVR + aVL + aVF = 0
ECG Limb Leads
- V1: 4th intercostal space (right)
- V2: 4th intercostal space (left)
- V3: Mid-way b/w V2-V4
- V4: Mid-clavicle line in 5th intercostal space
- V5: Anterior axillary line
- V6: Mid-axillary line
*Placement is key, but can be highly variable*
Let me know what you think and stay tuned for the next ECG thread!
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