The purpose of this book is to teach nurses and other allied health professionals how to easily and confidently interpret 12-lead electrocardiograms using the principles of pattern recognition. We begin with some basic principles and then move on to more specific clinical topics. Areas covered include right and left bundle branch block as well as the fascicular blocks. A fast and easy way to determine axis deviation is presented. Other topics include chamber enlargement and hypertrophy. There is an elaborate section on coronary artery disease including the patterns associated with myocardial infarction. Numerous rhythm and conduction abnormalities are also examined. Special clinical cases such as pericarditis, Wolff Parkinson White, and permanent pacemaker patterns are also reviewed. All of the topics have a strong clinical correlation. The last section is a ten case review to test the readers knowledge of the fundamental materials presented.