This site explains the similarities between bronchial asthma and heart failure ("cardiac asthma"). Some of the symptoms are the same because heart failure makes breathing difficult. But the underlying causes are very different and require distinct medical treatments.

This page succinctly explains the difference between bronchial (regular) asthma and cardiac asthma. Though the two may have some similarities, they both need to be treated very differently. This site contains crucial and beneficial information.