Introduction to 12-Lead ECGs
Objectives
At the end of this chapter, the student should be able to:
- Identify the various leads as they would appear on an ECG tracing. Identify the limb leads and the precordial leads on the ECG paper. (p 64)
- Discuss the formation of a three-dimensional view of the heart in space along the X, Y, and Z axes. (pp 64–65)
- Analyze and calculate the orientation and amplitude of a cardiac vector in three dimensions based on examination of the hexaxial and precordial systems on a clinical ECG. (Author’s note: Yes, you will be able to do that!) (pp 65–67)
- Describe the significance and be able to calculate the electrical axis of a 12-lead ECG to the appropriate quadrant quickly and efficiently. (pp 67–70)
- Discuss the concept of a bundle branch block and its clinical significance. (pp 70–72)
- Discuss, list the criteria, and identify a right bundle branch block (RBBB). (pp 72–74)
- Discuss, list the criteria, and identify a left bundle branch block (LBBB). (pp 74–76)
