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Background
On surface electrocardiographic (ECGs), it is difficult to differentiate Ito‐mediated J waves, a repolarization phenomenon seen in J wave syndromes (JWS) from terminal QRS deflections that mimic J waves (pseudo J waves) in intraventricular conduction delay (IVCD), an abnormality in depolarization. We hypothesize that the difference between the “maximum QRS duration” inclusive of J point...
Recent years have witnessed important advances in our appreciation of the mechanisms underlying the development of cardiac arrhythmias. Our understanding of these phenomena has been fueled by innovative advances in the genetic, ionic, and cellular basis for electrical disturbances of the heart. This chapter focuses on our present understanding of ionic and cellular mechanisms responsible for common...
A prominent J wave is encountered in a number of life-threatening cardiac arrhythmia syndromes, including the Brugada syndrome and early repolarization syndromes. Brugada syndrome and early repolarization syndromes differ with respect to the magnitude and lead location of abnormal J waves and are thought to represent a continuous spectrum of phenotypic expression termed J-wave syndromes. Despite two...
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