Question 1

What percussion sounds indicate normal abdominal findings?

Accepted Answer

Tympanic sound, which is high-pitched, loud, and relatively long, predominates over most of the abdomen because air-filled bowel loops lie closest to the abdominal wall. Dull sound occurs over dense organs like the liver and spleen. This contrast between tympany and dullness allows physicians to determine organ margins and detect pathologies like organomegaly or fluid accumulation.

Question 2

How do you measure liver span during abdominal percussion?

Accepted Answer

Start in the right midclavicular line below the umbilicus and percuss upward, marking where tympany changes to dullness—this is the lower border. Then percuss downward from the nipple line, marking where resonance changes to dullness—this is the upper border. Measure the distance between these marks in centimeters; normal liver span is 6-12 cm.

Question 3

What are the two main methods for detecting splenomegaly by percussion?

Accepted Answer

Traube's space percussion involves percussing from medial to lateral with the patient's left arm slightly abducted; overall dullness suggests enlargement. Castell's method uses percussion in the anterior axillary line during inspiration and expiration; a dull note or dullness appearing on inspiration indicates splenomegaly.

Question 4

How does percussion help diagnose the cause of a protuberant abdomen?

Accepted Answer

Percuss from the umbilicus laterally and mark where tympany changes to dullness. Then have the patient roll to their side and repeat, marking the new dullness level. If abdominal fluid is present, the dullness level shifts upward toward the umbilicus when supine compared to the side-lying position, indicating ascites.

Question 5

What does percussion tenderness indicate during an abdominal exam?

Accepted Answer

Tenderness elicited by percussion is abnormal and suggests peritoneal inflammation. During the exam, watch the patient's face for signs of discomfort and ask about tenderness. This finding warrants further investigation for conditions affecting the peritoneum and helps guide abdominal exam interpretation.

Question 6

Why is percussion performed over the lower anterior chest during abdominal examination?

Accepted Answer

The liver and spleen are partially covered by the rib cage, so percussion over the lower anterior chest is necessary to assess their full extent. Normally, dull sound appears over the right liver, while tympanic sound occurs over the left gastric air bubble and splenic flexure of the colon.

Question 7

What is the proper sequence for performing abdominal percussion?

Accepted Answer

Explain the procedure and obtain consent, then drape the patient to expose the torso. Percuss lightly over each of the nine abdominal regions, listening to intensity, pitch, and duration. Observe for discomfort, then percuss the lower anterior chest, pubic symphysis area, determine liver span, and assess for splenomegaly using appropriate maneuvers before evaluating for ascites.

Abdominal Exam II: Percussion - Assessment Quiz