A Patient with Chronic Obstructive Pulmonary Disease (COPD) Has Increasing

A patient with chronic obstructive pulmonary disease (COPD) has increasing dyspnea and is being evaluated for HF. Which test will be ordered to help differentiate between dyspnea due to lung dysfunction and dyspnea due to HF?

A) Atrial natriuretic hormone (ANH) level
B) Brain natriuretic peptide (BNP) level
C) Cardiac enzymes
D) Electrocardiogram (ECG)