Key Concepts in Lung Examination and Assessment

Auscultation and Chest Percussion

  • Initial Evaluation: After performing basic breath sounds and evaluating for any adventitious (abnormal) sounds through chest percussion, the next step is to assess vocal resonance to further investigate abnormalities.

Vocal Resonance Assessment

  • Methodology:
    • Use a stethoscope and listen specifically to areas with previous abnormal sounds.
    • Compare suspected areas to corresponding areas on the opposite side of the chest.
    • Ask the patient to vocalize softly (e.g., counting from 1 to 10) to create sound vibrations for assessment.
Bronchophony
  • Definition: Increased clarity of spoken sounds when auscultating through the stethoscope.
  • Normal vs. Abnormal: Normally, sounds are muffled. In bronchophony, there are clearer vibrations, indicating potential lung issues.
Pectoriloquy
  • Definition: Even clearer sounds can be heard, where actual words are distinguished through the stethoscope.
  • Etymology: "Pectoriloquy" comes from Greek roots: "pect" (referring to the chest) and "iloquy" (talking).
  • Pathophysiology: Suggests the transmission of sound through solid tissue, possibly indicating consolidation such as a tumor or pneumonia.
Whisper Pectoriloquy
  • Technique: Patient should whisper while counting to ensure clarity through the stethoscope and avoid sounds being transmitted directly to the examiner's ears.

Egophony

  • Definition: A special test where the patient vocalizes the letter "e". If the sound changes to an "ah" due to solid tissue (e.g., tumor or consolidation), it is referred to as egophony.
  • Etymology: "Egophony" literally means goat sound in Greek, referring to the phonetic change.
  • Clinical Relevance: Asymmetry in this sound change suggests possible lung consolidation.

Tactile Fremitus

  • Definition: Refers to the vibrations felt on the chest wall when a patient speaks.
  • Technique: Use the ulnar surface of hands to feel vibration while the patient counts (preferably to ten).
  • Interpretation:
    • Increased Fremitus: Suggests lung consolidation where sounds travel better through solid tissues.
    • Decreased Fremitus: Indicates fluid (effusion) in the pleural space where vibrations are not transmitted well.

Clubbing

  • Definition: Enlargement and swelling of the distal fingers or toes; often correlates with underlying serious conditions rather than hypoxia.
  • Diagnosis: Assess the Lovibond angle, which should be concave.
  • Test: The Shamrock's sign involves bringing the distal digits together to check for the diamond shape at the junction between the proximal nail fold and nail plate.
  • Significance of Clubbing:
    • Commonly associated with pulmonary conditions such as lung cancer, bronchiectasis, cystic fibrosis (80%).
    • Less commonly linked with congenital heart disease or other systemic diseases (20%).

Conclusion of Lung Examination

  • Essential to evaluate these various components to gain a thorough understanding of the respiratory system's health.