Dynamic auscultation in Respiratory System

 Dynamic auscultation is listening to breath sounds while the patient performs specific maneuvers (like deep breathing, coughing, forced expiration, or posture change) to reveal abnormal findings not heard during quiet breathing.

1. Forced expiratory auscultation

• Ask patient to blow out forcefully

         Example: Wheeze appears → Asthma, COPD

2. Post-tussive auscultation (after cough)

• Ask patient to cough, then listen again

         Example: Crackles disappear/change → secretions (Bronchiectasis)

Persistent crackles → Pneumonia

3. Deep inspiration auscultation

• Ask patient to take slow deep breaths

Example: Late inspiratory crackles → Pulmonary fibrosis

4.Mouth open vs closed breathing

• Compare breathing with mouth open vs closed

Example: Sound changes/stridor → upper airway obstruction

5.Postural (position) change auscultation

• Listen in sitting vs lying position

Example: Shifting findings → Pleural effusion