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Results: 5

1.
Figure 2

Figure 2. From: Intracardiac J-point elevation before the onset of polymorphic ventricular tachycardia and ventricular fibrillation in patients with an implantable cardioverter-defibrillator.

Flow diagram showing the distribution of spontaneous events in study participants. NSVT=non-sustained ventricular tachycardia

Larisa G. Tereshchenko, et al. Heart Rhythm. 2012 October;9(10):1594-1602.
2.
Figure 3

Figure 3. From: Intracardiac J-point elevation before the onset of polymorphic ventricular tachycardia and ventricular fibrillation in patients with an implantable cardioverter-defibrillator.

Scatterplots of baseline relative intracardiac FF EGM J-point amplitude by relative J-point amplitudes on 12 ECG leads.

Larisa G. Tereshchenko, et al. Heart Rhythm. 2012 October;9(10):1594-1602.
3.
Figure 1

Figure 1. From: Intracardiac J-point elevation before the onset of polymorphic ventricular tachycardia and ventricular fibrillation in patients with an implantable cardioverter-defibrillator.

Representative example of FF EGM in sinus rhythm. J-point amplitude is negative. T-wave is biphasic with first negative and second positive deflection. J-point is marked as a circle.

Larisa G. Tereshchenko, et al. Heart Rhythm. 2012 October;9(10):1594-1602.
4.
Figure 5

Figure 5. From: Intracardiac J-point elevation before the onset of polymorphic ventricular tachycardia and ventricular fibrillation in patients with an implantable cardioverter-defibrillator.

Representative example of an FF EGM and a surface ECG recorded in the study patient with a spontaneous sustained polymorphic ventricular tachycardia (PVT) event during follow-up: A. Baseline FF EGM in sinus rhythm. Small J-wave is visible. B. FF EGM immediately before (PVT). J-wave is dramatically enlarged. C. FF EGM recorded during this whole spontaneous PVT event, treated with ICD shock. D. Baseline surface 12-lead ECG of the same patient before ICD implantation.

Larisa G. Tereshchenko, et al. Heart Rhythm. 2012 October;9(10):1594-1602.
5.
Figure 4

Figure 4. Results of filtering experiment. From: Intracardiac J-point elevation before the onset of polymorphic ventricular tachycardia and ventricular fibrillation in patients with an implantable cardioverter-defibrillator.

A. Comparison of J-point elevation presentation on inferior ECG leads (II, III, aVF). Blue-color ECG represents surface ECG signal with applied 0.05 Hz high-pass filter. Red-color ECG represents the same ECG signal with applied bandpass filtering set to 3–60 Hz. B. Line plot of paired comparison of non-filtered and filtered 12 lead ECG. Relative J-point amplitude on each out of 12 ECG leads of 3 study subjects is plotted separately. C. Bland-Altman plot of difference vs. average value for each out of 12 lead ECG pair filtered vs. non-filtered signal. D. Correlation between non-filtered and filtered 12 lead ECG.

Larisa G. Tereshchenko, et al. Heart Rhythm. 2012 October;9(10):1594-1602.

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