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Chronic obstructive pulmonary disease (COPD) is the world's third leading cause of death, posing a significant public health challenge. Heart failure is an important milestone in the natural history of this disease's ever-decreasing course. Cor pulmonale alone is sometimes insufficient to explain the scenario, as many heart failures are refractory even after standard treatment. A possible explanation is involvement of the left ventricle (LV). However, there is currently no consensus on a therapeutic approach to LV dysfunction in COPD. Some previous studies were conducted on COPD patients regardless of the presence or absence of other factors influencing LV function. This study attempted to rule out all known confounding factors/co-morbidities that influence LV function. We discovered that LV diastolic dysfunction was common in subjects at all stages of COPD. We believe that all COPD patients, regardless of stage, should have screening echocardiography.