To assess for fluid in the pleural space, which lung assessment technique should a nurse prioritize?

A. Auscultation: This technique allows the nurse to identify diminished or absent breath sounds over the area where fluid has displaced lung tissue. While auscultation is vital for assessing ventilation, it does not provide the same structural information as percussion regarding the density of the space. It helps localize the area of decreased air entry. B. Inspection: Visual assessment can reveal asymmetrical chest expansion or a bulging of the intercostal spaces in very large effusions. However, inspection is a superficial technique that cannot confirm the presence of internal fluid within the pleural cavity. It is a preliminary step that requires more specific follow-up. C. Palpation: The nurse uses palpation to assess for tactile fremitus, which is typically decreased over a pleural effusion because fluid blocks sound transmission. While useful, palpation is subjective and less definitive than percussion for identifying fluid boundaries. It is often used to supplement other physical exam findings. D. Percussion: This technique involves tapping the chest wall to produce sounds that reflect the density of the underlying structures. A dull or flat percussion note is a classic finding when fluid replaces the normally resonant, air-filled lung tissue. It is the most specific physical assessment for identifying pleural fluid.