Since

  Right leg is the ground cable and

  Right and left legs are almost at a similar distance to the heart,

reversal of only the leg leads
do not result in significant ECG changes .




         
ECG
1a (left) and 1b (right). The compact ECGs above belong to a 71 years-old man with coronary artery disease.
The ECG
1a was recorded with the electrodes in correct position.
The ECG
1b was recorded after right leg - left leg lead reversal.
The two ECGs are very similar.




         
ECG
2a (left) and 2b (right). The two compact ECGs above belong to a 61 years-old man.
He had experienced acute inferior wall myocardial infarction due to Circumflex coronary artery obstruction 2 months ago
The ECG
2a was correctly recorded.
The ECG
2b was recorded after right leg - left leg lead reversal.
The two ECGs are very similar.