Background:Development of right ventricular hypertrophy and eventual right side heart failure is common in patients with chronic obstructive pulmonary disease (COPD). However, some disturbance in left ventricular (LV) function has been observed among such patients. The co-existence between chronic obstructive pulmonary disease (COPD) and heart failure has been previously described. However, the co-existence between COPD and subclinical LV dysfunction, without the presence of heart failure symptoms, is less well understood. P=0.128), and RVMPI (Beta =1.436, p=0. 3(98.87 ± 8.41ms) 009). LV diastolic function parameters (A, E/A, and deceleration time of E) were impaired for groups 2 and 3 compared with group 1.Mitral early diastolic and late diastolic annular velocities ratio (Em/Am), were significantly lowest in COPD patients with PH(0.77±0.066), and the isovolumetric relaxation time (IVRT) was significantly longer in group 3(105.43±4.21ms) and group 2(102.27±4.45ms) in relation to control group(71.2±5.51ms). RV diastolic function, E/A ratio was higher in the control subjects compared with the patient groups. The tricuspid inflow velocities ratio (E/A) was significantly lowest value in COPD p=atients with PH (0.84 ± 0.04) and the isovolumetric relaxation time (IVRT) was significantly longer in group