Final answer:
Shortness of breath is a finding unique to left-sided heart failure.
Step-by-step explanation:
The finding unique to left-sided heart failure is Shortness of breath. Left-sided heart failure occurs when the left ventricle of the heart is unable to pump sufficient blood into the systemic circulation. This leads to an increase in fluid backing up in the pulmonary circulation, which results in excess fluid in the lungs and difficulty breathing.