Electrocardiography I: Electrodes, Currents, and Leads

Concept: Current Vectors and the Total Current Vector

3m

Concept: Electrodes, Leads, and Einthoven's Triangle

3m

Concept: Deflection Direction in ECGs

4m

Problem: Near the end of a cardiac cycle the total current vector in the heart points toward the right shoulder. Which of the following shows the likely deflection direction of the EKG in Leads I, II, and III (respectively) caused by this total current vector toward the right shoulder?

4m