Lung resection procedures

🫁 Anatomy - Know Your Lobes

• Right Lung: 3 lobes (Superior, Middle, Inferior).
  • Separated by Horizontal & Oblique fissures.
  • 10 bronchopulmonary segments.
• Left Lung: 2 lobes (Superior, Inferior).
  • Separated by Oblique fissure.
  • Lingula: Homologue of the R middle lobe.
  • 8-10 bronchopulmonary segments.
• 📌 Right = 3 lobes; Left = 2 lobes.

⭐ Aspiration in a supine patient most commonly affects the posterior segment of the right upper lobe or the superior segment of the right lower lobe.

🔪 Indications for Resection

• Primary Goal: Curative intent for malignancy or definitive treatment for symptomatic benign disease after medical management fails.

• Malignant:

  • NSCLC (Stages I, II, select IIIA).
  • Solitary pulmonary metastasis (e.g., colon, sarcoma).
  • Low-grade malignancies (e.g., carcinoid tumors).

• Benign:

  • Localized bronchiectasis, aspergilloma, recurrent pneumothorax, AVMs.

⭐ For Non-Small Cell Lung Cancer (NSCLC), surgical resection is the standard of care for Stage I and II disease, offering the best chance for cure.

🫁 Management - The Resection Roadmap

• Pre-operative Assessment:
  • Crucial for determining operability and predicting outcomes.
  • Key metrics: Pulmonary Function Tests (PFTs), especially FEV1 and DLCO.
  • Calculate predicted post-operative FEV1 (ppoFEV1) to assess remaining lung function.
  • $ppoFEV1 = Pre-op FEV1 \times \frac{(19 - \text{# segments resected})}{19}$
  • (Total segments: 10 Right, 9 Left).

⭐ A predicted post-operative FEV1 (ppoFEV1) or ppoDLCO < 40% of the predicted value indicates high risk for complications and may preclude major resection.

• Types of Resection:

• Wedge: Non-anatomic; for peripheral nodules, biopsy, or mets.
• Segmentectomy: Anatomic; preserves parenchyma, for small tumors or poor PFTs.
• Lobectomy: Anatomic; gold standard for most Stage I/II NSCLC.
• Pneumonectomy: Entire lung; high morbidity, reserved for central tumors crossing fissures.

⚠️ Complications - Post-Op Pitfalls

• Air Leak: Persistent bubbling in chest tube water seal > 5-7 days.
• Hemorrhage: Chest tube output > 200 mL/hr.
• Arrhythmias: Atrial fibrillation is most common (esp. post-pneumonectomy).
• Atelectasis: Most common early issue; prevent with incentive spirometry.
• Bronchopleural Fistula (BPF): Surgical emergency.
• Empyema: Pus in pleural space, often follows BPF.
• Chylothorax: Thoracic duct injury → milky fluid (↑ triglycerides).
• Postpneumonectomy Syndrome: Late mediastinal shift (esp. post-right pneumonectomy).

⭐ Bronchopleural Fistula (BPF): Presents with new/increasing air leak, fever, and productive cough. CXR shows a new/enlarging air-fluid level in the post-resection space. High mortality; requires urgent intervention.

⚡ Biggest Takeaways

• Pre-op evaluation is critical: predicted post-op FEV1 >40% and DLCO >40% are required for major resection.
• Anatomic lobectomy is the gold standard for most Stage I/II non-small cell lung cancer (NSCLC).
• VATS is preferred over open thoracotomy for less pain and shorter recovery.
• The most common complication is a prolonged air leak (>5-7 days).
• Bronchopleural fistula (BPF) is a severe complication, especially post-pneumonectomy, presenting with a new air-fluid level.