Abstract 259: Single or Multibeat Modality for 3D Echocardiography Left Ventricular Volumes Assessment: Comparison Study With MRI
OBJECTIVE: Several cardiac cycles (beats) are required for Real Time 3D Echocardiography (RT3DE) full volume acquisition with current systems. Recent advances in technology allow acquiring the whole myocardium volume within only one or two beats but with lower frame rate. The purpose of the study is to assess the optimal number of beats required for RT3DE accurate measurements of left ventricular (LV) volumes and ejection fraction (EF).
METHODS: Thirty five consecutive patients (61.5±17.8 years, 61% men, 33% coronary artery disease) with good echocardiographic image quality underwent RT3DE (Vivid E9, GE) and MRI (Siemens 1.5T) on the same day. LV volumes and EF were computed (4D Auto LVQ GE analysis software) from 3D datasets acquired using one and several beats (2, 3 and 4) and were compared to cine-MRI short axis measurements (Argus Siemens software).
RESULTS: The temporal resolution of RT3DE dataset acquired using 1, 2, 3 and 4 beats was 6±2, 14±9, 17±6 and 22±7 frame rate per cardiac cycle respectively. Regardless of the number of beats and temporal resolution RT3DE provided a fair correlation with MRI for LVED (r2 ranged from 0.8 to 0.85) with similar systematic underestimation (bias ranged from −22 to −25mL). In contrast LV end systolic volume and EF (See Figure⇓) were strongly affected by temporal resolution with the tightest 95% CI agreement with MRI for 2 beats datasets for both (32mL and 10% respectively).
CONCLUSION: New fast RT3DE acquisitions of LV full volume requires a minimal temporal resolution to ensure an accurate measurement of LV volumes and EF that seems warranted using two beats 3D datasets.