ECG leads V1H to V6H and V1L to V6L

[Melclin]

http://cardiophile.org/2011/02/ecg-leads-v1h-to-v6h-and-v1l-to-v6l.html

V1L to V6L are useful when the heart is shifted down as in emphysema. In emphysema, conventional leads (V1 to V6) will mimic V1H to V6H. V1H to V6H are also known as high precordial leads or high chest leads. High chest leads are sometimes useful in detecting high lateral wall infarction.

Anyone use these modified chest leads or know anything more about their utility than the above?