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Any low frequency positive deflections (notching or slurring) above the level of the ST segment at the J point
J waves are distinct from the J point (2 completely different and unrelated events)
Classically seen in early repolarization, hypercalcemia, hypothermia (Osborne waves), and Brugada syndrome
References:
Surawicz B, Macfarlane PW. Inappropriate and confusing electrocardiographic terms: J-wave syndromes and early repolarization. J Am Coll Cardiol. 2011;57(15):1584-1586. PMID: 21474037
Perez MV, Friday K, Froelicher V. Semantic confusion: the case of early repolarization and the J point. Am J Med. 2012;125(9):843-844. PMID: 22340816
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