12 Lead EKG

Electrocardiography (ECG, or EKG [from the German Elektrokardiogramm]) is a transthoracic interpretation of the electrical activity of the heart over time captured and externally recorded by skin electrodes. It is a noninvasive recording produced by an electrocardiographic device. The etymology of the word is derived from the Greek electro, because it is related to electrical activity, cardio, Greek for heart, and graph, a Greek root meaning "to write". In English speaking countries, medical professionals often write EKG (the abbreviation for the German word elektrokardiogramm) in order to avoid confusion with EEG.

EKG - Lesson 1

Electrocariography - Wikipedia
ECG Learning Center - Dr. Alan Lindsay

Lead 2 EKG:
Lead 2 EKG Interpretation - TheMedStud.com

12 Lead EKG Strips:
ECG Library
12 Lead ECG