ECG has 10 electrodes and produces 12 ECG leads reading. How is happen from 10 electrodes to 12 leads?
Bipolar electrodes
RA - right arm
LA - left arm
LL - Left leg
RL - Right Leg
Unipolar Electrodes
V1 V2 V3 V V5 V6
while 12 leads happen from 10 electrodes configurations
Lead I = Right arm - Left arm
Lead II = Right arm - Left Leg
Lead III = Left arm - Left Leg
Lead aVr = Left arm and Left leg - Right arm
Lead aVl = Left leg and Right arm - Left arm
Lead aVf = Left arm and Right arm - Left leg
Lead V1, V2, V3, V4, V5 and V6

12 Lead ECG Placement




















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