Left upper pulmonary vein on transesophageal echocardiogram

Panel A: Horizontal (0º) imaging shows the left upper pulmonary vein (LUPV, panel A). Note the position of the pulsed Doppler sample volume obtained from the proximal portion of the vein (red arrow). Panel B shows the normal pulsed Doppler spectra of pulmonary venous flow; there is a biphasic pattern with a predominance of pulmonary venous flow during ventricular systole (*). There is also mild flow reversal in the pulmonary vein related to atrial systole (+).