Four- and five-chamber views during transesophageal echocardiogram

Horizontal (0°) imaging of the heart at 32 cm from the incisors (panel A) demonstrates the four-chamber view. Well seen are the body of the left atrium (LA), mitral valve (MV), foreshortened left ventricle (LV), right atrium (RA), tricuspid valve (TV), foreshortened right ventricle (RV), and Eustachian valve (EV). In panel B the probe is at a slightly more proximal location (28 cm from the incisors), generating the five-chamber view. Well seen are the LA, LV, RV, anterior and posterior mitral valve leaflets (AML and PML), interventricular septum, left ventricular outflow tract (LVOT), aorta (Ao), and aortic valve (AoV). The LV is often foreshortened and the true apex is generally not seen in these orientations.