Fig. 1

Representative echocardiographic images of the left ventricle for the three different groups. Two-dimensional echocardiographic image of the control group, diabetic group and alogliptin-treated diabetic group (A–C, top) and Doppler tissue imaging (bottom). LV left ventricle, RV right ventricle; AO aorta, e′ early diastolic mitral annular velocity, a′ late diastolic mitral annular velocity, n = 10 per group