Which percussion finding is associated with hyperinflated lungs in conditions like COPD?

Hyperresonance is a percussion finding that indicates excessive air in the lungs, commonly observed in conditions such as chronic obstructive pulmonary disease (COPD) or in pneumothorax. When the lungs become hyperinflated due to trapped air, the sound produced during percussion is more resonant than normal, resulting in a heightened, hollow sound. This is in contrast to other possible findings, such as dullness or flatness, which indicate the presence of fluid, solid lung tissue, or diminished air content, as seen in conditions like pneumonia or pleural effusion. Therefore, in the context of conditions associated with hyperinflated lungs, such as COPD, hyperresonance accurately reflects the pathophysiological changes occurring in the respiratory system.