Click on image to view larger version.

Figure 1 Epicardial cross-sectional longitudinal examination of the left atrial (LA) cavity, a pulmonary vein sinus (s) and a left lower pulmonary vein (v) (from pig # 566). (A) The LA high-fidelity catheter (white arrow) is advanced in and indicates a lower left pulmonary vein. (B) Color Doppler inflow into the LA chamber from the pulmonary vein. The white asterisk indicates the pulmonary vein.