Comprehensive Guide to Respiratory System Examination for Medical Students

Introduction

The video demonstrates a step‑by‑step respiratory examination performed by a fourth‑year medical student on a volunteer patient. It covers history taking, consent, general inspection, palpation, measurement of chest diameters, percussion, and auscultation, and links findings to common pathologies such as asthma, COPD, pleural effusion, pneumothorax, consolidation, and tumors.

1. History and Consent

• Begin with a generalized history to confirm the problem is respiratory.
• Obtain patient consent before proceeding, explaining that the exam is usually done without clothing but can be modified for comfort.

2. General Examination

• Look for cyanosis of the tongue and fingertips.
• Assess for clubbing of the fingertips.
• Examine the cervical and axillary regions (drainage pathways for lungs).

3. Inspection (Visual Assessment)

• Tracheal position: should be central; deviation suggests mediastinal shift.
• Chest symmetry: both sides should rise equally.
• Skeletal deformities: pectus excavatum, pectus carinatum, scoliosis, kyphosis.
• Scars or lesions on the chest wall.
• Apical impulse: normally at the left 5th intercostal space, mid‑clavicular line; displacement may indicate lung pathology.
• Shoulder droop and intercostal indrawing (visible retraction) – especially in asthma or severe volume‑loss states.
• Spine and sternum assessment for tenderness (possible rib or malignancy pain).

4. Palpation

• Temperature: feel for localized warmth.
• Tenderness: bony tenderness may indicate rib fracture or malignancy.
• Respiratory movements:
• Place hands on the clavicular joints, run middle fingers down the chest to feel tracheal deviation.
• Observe up‑and‑down (vertical) and expansion (horizontal) movements during deep breathing.
• Assess bucket‑handle movement (lateral expansion of the lower ribs).
• Chest expansion measurement:
• Use a tape at the nipple line (anterior) and at T7 level (posterior).
• Normal expansion ≥2 cm; reduced expansion suggests restrictive disease or large lesion.
• Chest diameters:
• AP diameter (anterior‑posterior) measured at the level of the nipples/T7.
• Transverse diameter measured at the same level; normally greater than AP.
• A barrel‑shaped chest (AP ≈ transverse) is typical of COPD.

5. Percussion

• Systematically percuss six zones on each side:
• Supraclavicular
• Clavicular
• Infraclavicular (upper, middle, lower)
• Axillary
• Posterior (suprascapular, interscapular, infrascapular)
• Normal note: resonant (air‑filled lung).
• Dullness:
• Over liver (right lower zone) – shifts with deep inspiration.
• Persistent dullness above diaphragm may indicate tumor, consolidation, or pleural effusion.
• Hyper‑resonance: suggests pneumothorax or large emphysema.
• Compare left and right sides continuously.

6. Auscultation (Osculation)

• Bronchial breath sounds – high‑pitched, with a pause between inspiration and prolonged expiration; heard over trachea, may be heard over consolidation or tumor.
• Vesicular breath sounds – low‑pitched, normal for peripheral lung fields.
• Alterations:
• Bronchial over peripheral area → consolidation or tumor.
• Reduced vesicular sounds → pleural effusion or pneumothorax (air is a poor conductor).
• Crackles (crepitations) → fibrosis, late‑stage pneumonia, fibrothorax.
• Vocal fremitus & resonance (using a stethoscope and a tuning fork):
• Increased fremitus → solid tissue (consolidation, tumor).
• Decreased fremitus → fluid or air (pleural effusion, pneumothorax).

7. Clinical Correlation

• Asthma vs. COPD:
• Asthma – younger, allergic/family history, intermittent symptoms, >15 % FEV₁ improvement after bronchodilator.
• COPD – older, strong smoking history, persistent dyspnea, limited reversibility.
• Pleural Effusion:
• Dullness, decreased breath sounds, reduced fremitus, tracheal shift away from the side.
• Pneumothorax:
• Hyper‑resonance, absent breath sounds, tracheal shift away from the side, reduced chest expansion.
• Consolidation/Tumor:
• Dullness, bronchial breath sounds, increased fremitus, tracheal shift toward the side (tumor) or away (large mass).
• Fibrosis:
• Fine crackles, reduced compliance, possible barrel chest.

8. Practical Tips for Students

• Always compare both sides for symmetry.
• Use gentle percussion to avoid aggravating distress.
• If a patient is in acute respiratory distress, prioritize stabilization and imaging over exhaustive examination.
• Remember that anatomical variants (e.g., pectus excavatum) can mimic pathological findings.

Conclusion

The respiratory examination is a systematic process that integrates visual inspection, tactile assessment, percussion, and auscultation. Mastery of each step and understanding how findings correlate with common pulmonary conditions enable accurate bedside diagnosis and guide timely management.

A thorough, stepwise respiratory exam—starting with history and consent, followed by inspection, palpation, measurement, percussion, and auscultation—provides essential clues to differentiate asthma, COPD, pleural effusion, pneumothorax, consolidation, and tumors, empowering medical students to make accurate bedside diagnoses without relying on imaging alone.