| Imagining |
|---|
| Measurement |
| Echocardiography, nuclear, CMR |
| Anatomic position |
| Measurement |
| LV lead to latest activation site determined using imaging |
| Timing |
| Measurement |
| Greatest delay from onset of QRS to local LV electrogram |
| Contractility |
| Measurement |
| Acute increase in dP/dtmax or pulse pressure (systolic minus diastolic blood pressure) |
CMR, cardiac magnetic resonance; LV, left ventricular; RV, right ventricular.