Asthma–chronic obstructive pulmonary disease overlap syndrome

The burgeoning literature on asthma phenotypes and endotypes continues to deepen our understanding of asthma and our appreciation of the complexity of this heterogeneous syndrome. Physicians in practice have long encountered patients who have features of asthma and chronic obstructive pulmonary disease (COPD). Thus, we should not be surprised that there is a new category called asthma-COPD overlap syndrome (ACOS).

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