Criteria used to distinguish VT from AF/AT using ICD scatter plots and intracardiac EGMs
| Ventricular tachycardia . | Atrial fibrillation/Atrial tachycardia . |
|---|---|
| Onset of tachycardia in ventricle | Onset of tachycardia in atrium |
| V rate > A rate | A rate > V rate |
| A and V dissociation | V rate dependent on A events for 1 to 1 tachycardias |
| Stable V–V relation (delta V ≤40 ms) | Variable V–V intervals (delta V >40 ms) |
| V–A timing constant and <50% of TCL compatible with retrograde conduction | Variable V–A timing suggesting AT |
| Ventricular tachycardia . | Atrial fibrillation/Atrial tachycardia . |
|---|---|
| Onset of tachycardia in ventricle | Onset of tachycardia in atrium |
| V rate > A rate | A rate > V rate |
| A and V dissociation | V rate dependent on A events for 1 to 1 tachycardias |
| Stable V–V relation (delta V ≤40 ms) | Variable V–V intervals (delta V >40 ms) |
| V–A timing constant and <50% of TCL compatible with retrograde conduction | Variable V–A timing suggesting AT |
Criteria used to distinguish VT from AF/AT using ICD scatter plots and intracardiac EGMs
| Ventricular tachycardia . | Atrial fibrillation/Atrial tachycardia . |
|---|---|
| Onset of tachycardia in ventricle | Onset of tachycardia in atrium |
| V rate > A rate | A rate > V rate |
| A and V dissociation | V rate dependent on A events for 1 to 1 tachycardias |
| Stable V–V relation (delta V ≤40 ms) | Variable V–V intervals (delta V >40 ms) |
| V–A timing constant and <50% of TCL compatible with retrograde conduction | Variable V–A timing suggesting AT |
| Ventricular tachycardia . | Atrial fibrillation/Atrial tachycardia . |
|---|---|
| Onset of tachycardia in ventricle | Onset of tachycardia in atrium |
| V rate > A rate | A rate > V rate |
| A and V dissociation | V rate dependent on A events for 1 to 1 tachycardias |
| Stable V–V relation (delta V ≤40 ms) | Variable V–V intervals (delta V >40 ms) |
| V–A timing constant and <50% of TCL compatible with retrograde conduction | Variable V–A timing suggesting AT |
This PDF is available to Subscribers Only
View Article Abstract & Purchase OptionsFor full access to this pdf, sign in to an existing account, or purchase an annual subscription.
