PMC9833357_01
Initial 12-lead electrocardiogram revealed sinus rhythm with notched type J wave and >0.1 mV ST-segment elevation at inferior leads.
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The initial ECG (Figure 1) showed sinus rhythm and a normal QTc interval of 431 ms with notched type J wave and ST-segment elevation in leads II, III, and aVF.
Electrocardiogram during peak treadmill test showed wide QRS-complex tachycardia, suggesting ventricular tachycardia.
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Analysis of the ECG (Figure 2) highlighted a wide QRS-complex tachycardia episode that lasted less than 1 minute and terminated spontaneously; afterward, no ST-segment changes occurred.
Electrocardiogram after implantable cardioverter defibrillation implantation showed persisting early repolarization patterns in the inferior leads similar to the initial examination accompanied with bigeminy premature ventricular complex.
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Postprocedural ECG (Figure 3) showed a persisting ER pattern, similarly to the initial ECG, with frequent premature ventricular complexes that may serve as trigger for VA.