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🫁 High-Yield ICU Chest X-Ray Findings

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1. Normal ICU Chest X-Ray — Devices in Situ

• Airway: ETT tip should be 3–5 cm above the carina (ideally at level of the aortic arch); check for tracheal deviation
• Breathing: Lung fields — symmetric aeration, no pneumothorax, no consolidation, no effusion
• Cardiac: Cardiothoracic ratio < 0.5 on PA (< 0.55 acceptable on AP portable)
• Diaphragm: Costophrenic angles sharp; right hemidiaphragm slightly higher than left
• Everything else: NGT, central line, chest tubes, pacemaker leads — confirm positions

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2. Endotracheal Tube Malposition — Right Mainstem Intubation

• Most common because the right mainstem bronchus is shorter and less angulated than the left
• Immediate fix: pull ETT back until tip sits above carina
• Mediastinal shift toward the collapsed (left) side — distinguishes this from tension pneumothorax, where shift is away from the pathology
• On exam: absent breath sounds on the left; ventilator shows increasing peak pressures

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3. Tension Pneumothorax

• Tracheal + mediastinal shift AWAY from the affected side
• Hyperlucent hemithorax with absent lung markings
• Depressed ipsilateral hemidiaphragm
• ± Cardiac silhouette displaced

• This is a clinical diagnosis — do NOT wait for CXR if patient is unstable
• Immediate treatment: needle decompression (2nd intercostal space, midclavicular line) → definitive chest tube
• In ventilated patients: sudden ↑ peak airway pressures + hypotension + hypoxia = tension PTX until proven otherwise
• Deep sulcus sign on supine AP CXR (air collects anteriorly, costophrenic angle appears abnormally deep and lucent)
• Post-decompression complication: re-expansion pulmonary edema (bilateral infiltrates developing after rapid lung re-expansion — shown in Panel B above)

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4. Simple Pneumothorax (Barotrauma)

• Thin visceral pleural line (white line) visible, with absent lung markings peripheral to it
• No mediastinal shift (unlike tension PTX)

• Highest risk: mechanically ventilated patients (barotrauma from high tidal volumes/pressures)
• Associations: ARDS, bullous emphysema, post-procedural (central line placement)
• Small PTX in a non-ventilated, stable patient → observation; in ventilated patients → chest tube mandatory (will progress to tension)
• Subcutaneous emphysema (air in soft tissues — streaky lucency in neck/chest wall) is a tip-off to underlying barotrauma

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5. ARDS — Acute Respiratory Distress Syndrome

• Bilateral diffuse alveolar infiltrates (both lung fields, not respecting lobar/segmental boundaries)
• Rapid onset (within 1 week of precipitating event)
• No cardiac enlargement, no Kerley B lines (non-cardiogenic)

• Diffuse bilateral opacities NOT fully explained by effusions, atelectasis, or nodules
• PCWP < 18 mmHg OR no evidence of CHF (to exclude cardiogenic pulmonary edema)
• Management: lung-protective ventilation (tidal volume 6 mL/kg IBW, plateau pressure ≤ 30 cmH₂O), prone positioning for severe ARDS (P/F ≤ 150)

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6. Cardiogenic Pulmonary Edema — "Bat-Wing" / Perihilar Pattern

• Cardiomegaly (CTR > 0.5)
• Cephalization of pulmonary vessels (upper lobe vessel prominence > lower lobe)
• Clouding — perihilar "bat-wing" opacity, interstitial haziness
• Costophrenic blunting — small bilateral pleural effusions
• Kerley B lines — short horizontal lines at peripheral lung bases (thickened interlobular septa from interstitial fluid)

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7. Pleural Effusion

• Blunting of costophrenic angle (needs ~200 mL to blunt on PA; ~50 mL on lateral)
• Meniscus sign — curved upper border tracking up the lateral chest wall
• Silhouette of diaphragm lost on the affected side

• Supine ICU films: effusions appear as homogeneous opacification of the entire hemithorax (fluid layers posteriorly)
• Large effusion → mediastinal shift away (distinguish from collapse, where shift is toward)
• Common ICU causes: CHF, sepsis (para-pneumonic), post-op, hypoalbuminemia
• Ultrasound is far more sensitive and guides drainage

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8. Lobar Consolidation / Pneumonia

• Dense, lobar/segmental opacity with maintained lung volume
• Air bronchogram sign — tubular air-filled bronchi visible within the opacified lung (patent airways surrounded by fluid-filled alveoli)
• Borders defined by fissures (distinguishes lobar from ARDS)

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9. Central Line Malposition & Complications

1. Tip position: Should be at SVC-RA junction (right tracheobronchial angle, ~T4–T6)
2. No pneumothorax (occurs in ~1–3% of subclavian/IJ insertions)
3. No mediastinal widening (hematoma from arterial injury)
4. No new pleural effusion (hemothorax, infusion into pleural space)

• Tip too lateral → arterial placement (subclavian artery) — requires urgent removal
• Tip turned up the contralateral neck → guidewire malposition into opposite jugular
• New large pleural opacity after CVC placement → hemothorax or infusion extravasation

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Quick Summary Table

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