2.4 Thorax Examination/Findings
Key Takeaways
- Thoracic examination follows four classic modalities—inspection, palpation, percussion, and auscultation—applied systematically to the heart and lungs.
- Inspection and palpation detect chest wall deformity, tactile fremitus changes, and point tenderness that distinguishes musculoskeletal from visceral chest pain.
- Percussion notes (resonant, dull, hyperresonant) and auscultation of heart sounds and breath sounds localize pulmonary and cardiac pathology tested on Part II.
- Adventitious lung sounds—crackles, wheezes, rhonchi, pleural rub—and abnormal heart findings such as murmurs, gallops, and irregular rhythms mandate cardiopulmonary differentials.
- Chest pain with normal palpation but abnormal vitals, unequal breath sounds, or new murmur is a referral scenario even when thoracic spine tenderness is present.
2.4 Thorax Examination/Findings
Clinical Priority: Thorax examination accounts for roughly 8% of General Diagnosis. NBCE expects competence in inspection, palpation, percussion, and auscultation of heart and lungs—and the clinical reasoning to know when thoracic spine treatment is appropriate versus when chest pain demands cardiopulmonary workup.
Overview of the Four-Modalities Approach
| Modality | Primary Targets | Key Information |
|---|---|---|
| Inspection | Chest shape, respiratory effort, skin | Barrel chest, retractions, cyanosis, asymmetry |
| Palpation | Chest wall, apex beat, fremitus | Tenderness, masses, PMI location, pleural rub feel |
| Percussion | Lungs, heart borders | Dullness (consolidation/effusion), hyperresonance (pneumothorax) |
| Auscultation | Heart and lung fields | Murmurs, gallops, breath sounds, adventitious sounds |
Always examine in a warm, quiet room with the patient properly disrobed. Compare right and left sides. For auscultation, use the diaphragm for high-pitched sounds (S1/S2, crackles) and the bell for low-pitched murmurs (mitral stenosis)—though NBCE rarely tests subtle bell technique, knowing the principle matters.
Inspection
Observe rate, rhythm, and depth of respiration. Accessory muscle use, nasal flaring, tripod positioning, and paradoxical breathing suggest respiratory distress. Barrel chest and prolonged expiration suggest COPD. Asymmetric chest expansion may indicate pneumothorax, pleural effusion, or phrenic nerve palsy.
Note scars (sternotomy, thoracotomy), pacemaker, and distended neck veins (correlate with JVP). Cyanosis of lips or nail beds indicates significant hypoxemia.
Palpation
Chest Wall
Localize point tenderness over costochondral junctions (Tietze/costochondritis), ribs (fracture), or paraspinal muscles. Reproducible chest wall pain with palpation favors musculoskeletal etiology but does not exclude pulmonary embolism or acute coronary syndrome (ACS)—history and vitals still rule.
Tactile Fremitus
Place hands on chest bilaterally and have patient say "ninety-nine" (or "toy boat"). Increased fremitus suggests consolidation; decreased suggests pleural effusion, pneumothorax, or obstruction.
Apex Beat (PMI)
Locate the point of maximal impulse at the 5th intercostal space, midclavicular line (approximate). Displaced lateral/inferior PMI suggests left ventricular enlargement.
Percussion
Percuss bilaterally, apical to basal, comparing sides.
| Percussion Note | Typical Meaning | Clinical Example |
|---|---|---|
| Resonant | Normal aerated lung | Healthy adult |
| Dull | Fluid or solid | Pneumonia consolidation, pleural effusion |
| Stony dull | Large effusion | Empyema, hemothorax |
| Hyperresonant | Excess air | Pneumothorax, severe emphysema |
Cardiac dullness normally extends from the 3rd to 5th intercostal space left of the sternum; widened area of dullness may indicate cardiomegaly or pericardial effusion (with other signs).
Auscultation: Lungs
Use anterior, posterior, and lateral fields; ask patient to breathe deeply through the mouth. Listen full inspiratory and expiratory cycle at each site.
Normal Breath Sounds
| Sound | Location | Character |
|---|---|---|
| Vesicular | Most lung fields | Soft inspiratory, quiet expiratory |
| Bronchial | Over trachea | Loud inspiratory and expiratory |
| Bronchovesicular | 1st–2nd ICS anterior, between scapulae | Intermediate |
Bronchial breath sounds over peripheral lung suggests consolidation (pneumonia).
Adventitious Sounds
| Sound | Description | Associated Conditions |
|---|---|---|
| Crackles (rales) | Discontinuous popping, often inspiratory | Heart failure, pneumonia, fibrosis |
| Wheezes | Musical, mainly expiratory | Asthma, COPD, bronchospasm |
| Rhonchi | Low-pitched snoring | Secretions, bronchitis |
| Pleural rub | Grating, leather-like | Pleuritis, PE, pneumonia |
| Stridor | Inspiratory upper airway | Epiglottitis, foreign body—emergency |
Absent or decreased breath sounds on one side with hyperresonance and tracheal shift away suggest tension pneumothorax (emergency). Decreased sounds with dull percussion suggest effusion.
Auscultation: Heart
Identify S1 (mitral/tricuspid closure) and S2 (aortic/pulmonic closure). Note splitting (physiologic split S2 on inspiration). Additional sounds:
| Finding | Timing | Significance |
|---|---|---|
| S3 gallop | Early diastole | Heart failure, volume overload |
| S4 gallop | Late diastole | Stiff ventricle (HTN, ischemia) |
| Holosystolic murmur at apex | Systole | Mitral regurgitation |
| Systolic murmur at RUSB radiating to carotid | Systole | Aortic stenosis |
| Diastolic murmur at LUSB | Diastole | Aortic regurgitation |
Irregularly irregular rhythm without pulse deficit pattern suggests atrial fibrillation. Muffled heart sounds with hypotension and JVD suggest cardiac tamponade (Beck triad components).
Red Flags in Thoracic Examination
| Finding Cluster | Dangerous Diagnosis | Action |
|---|---|---|
| Crushing chest pain + diaphoresis + new murmur | ACS, papillary muscle rupture | Activate emergency cardiac pathway |
| Pleuritic pain + tachycardia + unilateral decreased breath sounds | Pulmonary embolism | Emergency evaluation |
| Sudden dyspnea + unilateral hyperresonance | Pneumothorax | Urgent imaging/treatment |
| Fever + crackles + dull percussion | Pneumonia | Medical management; defer thoracic HVLA if septic |
| S3 + basilar crackles + JVD | Acute heart failure | Emergency cardiology/medical care |
| Stridor + drooling | Epiglottitis | Airway emergency |
Musculoskeletal vs. Visceral Chest Pain
| Feature | More Musculoskeletal | More Visceral/Cardiopulmonary |
|---|---|---|
| Pain reproduction | Palpation reproduces pain | Pain not reliably reproduced |
| Relation to exertion | Variable | Angina with exertion |
| Breath sounds | Normal | Crackles, decreased sounds, rub |
| Hemodynamics | Stable vitals | Hypotension, tachycardia, hypoxemia |
| Response to positional change | Often changes with movement | May be pleuritic but not mechanical |
Chiropractors frequently see thoracic segmental dysfunction mimicking intercostal neuralgia. The safe pattern: when exam, ECG, or vitals disagree with a pure MSK story, prioritize visceral workup.
Examination Pitfalls
| Pitfall | Consequence | Prevention |
|---|---|---|
| Auscultating through clothing | Missed murmurs and fine crackles | Skin contact or single thin layer |
| Superficial listening time | False-negative findings | Listen at least one full cycle per site |
| Ignoring asymmetric findings | Delayed PE/pneumothorax diagnosis | Compare sides systematically |
| Attributing wheeze to "thoracic restriction" only | Miss asthma exacerbation | Treat bronchospasm medically when present |
| No cardiac exam in chest pain vignette | NBCE wrong answer | Always include heart auscultation |
| Percussion skipped | Miss effusion | Percuss posterior bases when indicated |
Documentation Example
"Inspection: no accessory muscle use. Palpation: reproducible tenderness left costochondral junction 3–4 without sternal pain. Percussion: resonant bilaterally. Auscultation: vesicular breath sounds without crackles or wheezes; heart RRR, no murmurs. Impression: localized chest wall pain; cardiopulmonary exam benign today—thoracic manipulation appropriate with monitoring instructions for worsening dyspnea or diaphoresis."
NBCE thorax items commonly ask which auscultation finding best matches a diagnosis, which next physical maneuver is highest yield, or which patient with chest pain requires immediate referral despite thoracic tenderness. Master the four modalities in order, and let abnormal heart and lung findings override musculoskeletal explanations when both are present.
Auscultation reveals decreased breath sounds, hyperresonance to percussion, and tracheal deviation away from the affected side. What is the most likely diagnosis?
Fine inspiratory crackles at the lung bases combined with an S3 gallop and jugular venous distension most strongly suggest which condition?
During lung auscultation, which maneuver most improves detection of subtle adventitious sounds?
A patient has reproducible parasternal tenderness without dyspnea. Breath sounds are vesicular bilaterally and heart sounds are normal. What is the most reasonable clinical impression?