. What is the predominant sound a nurse expects to hear when percussing a patient's abdomen?

Tympany is a high-pitched, drum-like sound produced by percussing over air-filled viscera such as the stomach and intestines. It is the dominant sound in a healthy abdomen due to the presence of intraluminal gas. Areas of dullness are typically restricted to solid organs like the liver or a full bladder. A. Tympany over all quadrants: Since the majority of the abdominal cavity is occupied by gas-containing loops of small and large intestines, tympany should be the most prevalent sound. It indicates a normal distribution of air within the digestive tract. This is the expected finding in a healthy patient. B. Dull sounds over the stomach and resonant sounds over the bladder: The stomach is an air-filled sac and should produce tympany, not dullness, unless it is completely full of food. A distended bladder produces dullness due to fluid, while resonance is typically heard over the lungs. This description is anatomically and acoustically incorrect. C. Resonance over the upper quadrants and dullness in the lower quadrants: Resonance is a sound found over healthy lung tissue and is not a standard abdominal percussion note. Dullness in the lower quadrants would suggest a massive fluid collection or pregnancy rather than a normal state. This does not represent a healthy abdomen. D. Dull sounds over all quadrants: Widespread dullness indicates the absence of air and would be highly pathological, suggesting massive ascites, a large tumor, or pregnancy. In a normal assessment, dullness is only expected over the liver in the right upper quadrant. It is not the predominant sound.