Background and Objectives : Early color M-mode Doppler flow propagation (Vp) has been used to distinguish pseudonormal from normal diastolic filling patterns. But the role of other indices including late diastolic propagation velocity (Ap), time delay of mitral flow propagation (VpTD and ApTD) is not clear. Subjects and Methods : Doppler echocardiographic examination was performed in 89 patients (60.6짹9.9 years, male 59.6%) with ejection fraction ���40% who were admitted for diagnostic coronary angiography. The clinical diagnoses on admission were stable angina (41.6%), unstable angina (30.3%), old myocardial infarction (24.7%) and atypical chest pain (3.3%). The diastolic filling patterns confirmed by mitral inflow and pulmonary venous flow were compared with the indices of Ap, VpTD and ApTD by color M-mode Doppler echocardiography. Results : Age, left ventricular ejection fraction, left ventricular end diastolic and end systolic dimension, left atrial size, E' and A' velocity of mitral annulus tissue Doppler were different significantly between patients with normal and abnormal diastolic filling patterns. In patients with normal filling, impaired relaxation and pseudonormalized filling pattern, VpTD were 63.1짹14.9 ms, 85.2짹25.5 ms and 107.8짹36.8 ms (p<0.001), E/Vp 1.3짹0.4, 1.6짹0.6 and 3.1짹0.7 (p<0.001), and E/VpTD 1.2짹0.5, 0.7짹0.2 and 0.9짹0.4 (p<0.001), respectively. Ap and ApTD showed significant difference between patients with normal filling pattern and those with pseudonormalized filling pattern (Ap 58.3짹23.5 vs. 36.2짹15.1, p=0.000; ApTD 47.1짹19.5 vs. 66.7짹22.2, p=0.001). PVa duration, the index depending on left ventricular end-diastolic pressure, was the most important independent predictor for ApTD by multiple regression analysis (R²=71.4%). Conclusion : The color M-mode Doppler indices of Ap, VpTD and ApTD are new diagnostic parameters for diastolic dysfunction.