Percussion is a clinical examination technique that involves tapping on the surface of the body to assess the condition of internal structures like the lungs and abdomen. Different percussion sounds provide information - a more resonant sound indicates air-filled hollow structures. Key positions to compare percussion notes on the chest include the anterior chest wall over the clavicle, infraclavicular region and ribs, the lateral chest wall from the 4th to 7th ribs, and the posterior chest wall above and below the spine of the scapula.

1. Percussions
Muhammad Umar Habib

2. • Percussion is a method of tapping on a
surface to determine the underlying
structure, and is used in clinical
examinations to assess the condition of
the thorax or abdomen

3. • Pleximetre
• Hammer

4. Percussion Sounds
• Resonant
• Hyper-resonant
• Stony dull
• Dull
• A more resonant sound indicates hollow,
air-containing structures

5. Percussion Of Thorax
• The positions in which percussions note
on the two sides should be compared are
as follows:
• Anterior Chest Wall
• Lateral Chest Wall
• Posterior Chest Wall

6. Anterior Chest Wall
• Clavicle
• Infraclavicular Region
• 2-6 Intercostal Space

7. Lateral Chest Wall
• Fourth to Seventh Intercostal Space

8. Posterior Chest Wall
• Percuss at Trapezius and Percussing
downward over the Lungs Apex
• Above the level of spine of scapula
• At intervals of 4-5 cm from below the level
of spine of scapula down to the eleventh
rib