Mitral valve diastolic flow spectroscopy is a color Doppler sampling of the mitral valve area, showing the sampled sections and blood flow signals, which can produce different spectral images. Mitral flow spectroscopy uses an ultrasound probe to measure blood flow information in the mitral valve area, including maximum flow velocity in early diastole, which can be represented by the letter E, and maximum flow velocity in late diastole, which can be represented by the letter A. The measurement is performed in the early diastolic and late diastolic phases. The ratio of early diastolic to late diastolic maximum flow velocity, represented by E/A, is plotted as a spectrum with a narrow diastolic bimodal shape. In a normal person, the E/A value should be greater than 1. If the E/A value is less than 1, it suggests that the heart may be hypodiastolic. If the mitral flow spectrum is abnormal, it is recommended to consult a physician to determine the cause of the problem and to provide appropriate treatment or therapy.