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Part of all ECGs, the J (junction) point is a point in time that occurs at the end of the QRS complex and the beginning of the ST segment
Marks the end of the QRS complex, and may be situated above the baseline (especially in young healthy males)
J point elevation of depression is seen in various ST segment abnormalities (MI, pericarditis, early repolarization)
The J point (time) is distinguished from the J wave, which is a low frequency positive deflection just before the J point
References:
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
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
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