II. Definitions

  1. J Point (Junction Point)
    1. Junction between end of QRS Complex and begining of ST Segment
  2. J Wave
    1. Deflection that forms at junction of QRS Complex and ST Segment, esp. lateral and precordial leads
    2. May appear as slurring or notch within the QRS (prior to the J Point and onset of ST Segment)

III. Causes: J Wave Syndromes

IV. Causes: Other J Wave causes

  1. Hypothermia (Temperature <32 C)
    1. J Wave amplitude increasing as core Temperature drops
  2. Myocardial Ischemia
  3. Sepsis
  4. Hypercalcemia
  5. Normal variant in some young patients
  6. CNS disorder
    1. Subarachnoid Hemorrhage
    2. Closed Head Injury

V. Differential Diagnosis

  1. Right Bundle Branch Block (RBBB)
    1. J Wave Type I (wide, large J Wave in leads V1-3) may appear similar to RBBB
    2. However, QRS Duration is not wide in lateral leads in J Wave (contrast with wide in RBBB)

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Related Studies

Ontology: j waves (C0878565)

Concepts Pathologic Function (T046)
English j waves, j wave