Misplacement of ECG leads can cause artifacts in the electrocardiogram.
old lateral MI
reversal RA and LA
old inferior MI
reversal RA and LL
reversal of precordial leads
precordial leads to high on chest
right bundle-branch block (rSR' complex)
non-sinus atrial rhythm
reversal RA and LA; reversal RA and LL; reversal of RA and RL
diffuse low voltage
reversal of RA and RL
inverted P waves in I, II, III, aVL
large q-wave in I, aVL
I and aVL as inversions of V5 and V6
inverted P waves in II, III, aVF
large q wave in II, III, aVF
insignificant q wave in III
reversal of LA and LL
low voltage in III
reversal of LA and RL
• RA = right arm; RL = right leg; LA = left arm; LL = left leg
• Reversal of RL and LL leads is not associated with a change in the ECG.
• The right leg (RL) lead is ground.
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