"Leads
In electrocardiography, the word lead (pronounced /lid/) refers to the signals transmitted and received between two electrodes."
"...The electrodes for the precordial leads (V1, V2, V3, V4, V5, and V6,) are placed directly on the chest"

http://en.wikipedia.org/wiki/Electrocardiography#Leads

"Ekg snima 12 odvoda koji predstavljaju razliku električnih potencijala između elektroda postavljenih na telo. Odvode možemo podeliti u dve grupe: periferne odvode (I, II, III, AVR, AVL, AVF) i perkordijalne odvode (V1, V2, V3, V4, V5, V6)."

http://sr.wikipedia.org/wiki/Elektrokardiogram

"Negative T wave in precordial V1-V5 leads, negative T wave in II, III, aVF, pulmonary P wave and right axis deviation >90% occurred with the highest incidence that was determined to be 43%, 32%, 30%, and 30% respectively"

http://linkinghub.elsevier.com/retrieve/pii/S002207360400041...

"Small q waves are present in the inferior and lateral precordial leads. ST-T wave abnormalities in these same leads is consistent with "strain," although the slight ST segment coving in leads [V.sub.5], [V.sub.6] in association with fairly symmetric T wave inversion also could reflect ongoing ischemia."

http://www.accessmylibrary.com/article-1G1-120611497/might-e...