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Rachel Bastiaenen et al. JACEP 2016;2:587-595
Measurement of the Ventricular Ectopic QRS Interval (VEQSI) (A) A ventricular ectopic beat (VEB) from a patient with prior myocardial infarction (MI) and no ventricular tachycardia (VT)/ventricular fibrillation (VF) (MI-no VT/ventricular fibrillation [VF] cohort). VEQSI measures 173 ms. (B) A VEB from a patient with prior MI and life-threatening ventricular arrhythmia (MI-VT/VF cohort). VEQSI measures 213 ms. In this example, the calibration has a gain of 10 mm/mV and speed of 100 mm/s. MI = myocardial infarction; VEB = ventricular ectopic beat; VEQSI = ventricular ectopic QRS interval. Rachel Bastiaenen et al. JACEP 2016;2: American College of Cardiology Foundation
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