Breath Sounds in Alveolar Exudates: Crackles, Rhonchi, Wheezes, and Absent Sounds

Alveolar exudates (fluid, pus, protein) from pneumonia, edema, hemorrhage alter lung acoustics. Auscultation reveals characteristic adventitious sounds.

1. Fine Crackles (Rales)

• High-pitched, brief, discontinuous popping (like rubbing hair).
• Late inspiratory (terminal).
• Caused by sudden opening of fluid-filled alveoli/small airways.
• Typical: early pneumonia, pulmonary edema, IPF, atelectasis.
• Gravity-dependent (bases).

2. Coarse Crackles

• Lower-pitched, longer, bubbling/gurgling.
• Early inspiratory and expiratory.
• Larger airway involvement (bronchiectasis, severe pneumonia, resolving edema).
• May change with coughing.

3. Rhonchi

• Low-pitched, continuous, snoring/gurgling.
• Secretions in larger bronchi causing turbulent flow.
• Clear or change with cough.
• COPD, bronchitis, cystic fibrosis, mucus plugs.

4. Wheezes

• High-pitched, continuous, musical.
• Airway narrowing (bronchospasm, edema, secretions, tumor).
• Expiratory (typical) or inspiratory (upper airway).
• Asthma, COPD, bronchiolitis, anaphylaxis.

5. Absent Breath Sounds

• Complete airway obstruction, massive effusion, pneumothorax, severe consolidation.
• Ominous sign; requires immediate imaging/intervention.

Clinical Correlation

Integrate with history, vitals, imaging, labs. Fine crackles + fever + infiltrate = pneumonia. Coarse crackles + JVD + edema = heart failure. Wheezes + prolonged expiration = asthma/COPD. Rhonchi + productive cough = bronchitis.