Section 7. Genetics and miscellaneous
J waves occur in the J point, which is the terminal portion of the QRS complex. J waves vary in amplitude and shape and they may be caused by both benign and potentially life-threatening conditions. A clinical syndrome which manifests with abnormal J waves is referred to as a J wave syndrome. This chapter discusses general aspects of the J wave syndromes.
This chapter provides an in-depth discussion on the Brugada syndrome, which is a rather mysterious and potentially life-threatening genetic disorder.
Early repolarization is one of the most frequently misunderstood syndromes. It is common and associated with 3 to 5 times as great a risk of sudden cardiac death. Learn all about early repolarization in this chapter.
This chapter elucidates electrocardiographic aspects of acute myocarditis (percarditis, perimyocarditis).
Learn about cardiac tamponade and electrical alternans, and how the ECG may be used to diagnose tamponade.
Learn about takotsubo cardiomyopathy and why this condition frequently results in unnecessary activations of the catheterization laboratory.