On post-operative day 4 after transthoracic oesophagectomy, a 58-year-old man's chest drain starts draining 900 mL per day of opalescent milky fluid. Fluid triglyceride level is 480 mg/dL. He is haemodynamically stable and the pleural cavity is fully drained. What is the most appropriate initial management?

• A Immediate thoracic duct ligation via right thoracotomy
• B Insertion of a pleuroperitoneal shunt
• C High-fat oral diet enriched with long-chain triglycerides
• D Nil by mouth with total parenteral nutrition and subcutaneous octreotide ✓

Explanation

Milky drainage exceeding roughly 1000 mL per day with a triglyceride level above 110 mg/dL confirms chylothorax from thoracic duct injury. When output is below about 1000 mL per day and the patient is stable, conservative management comes first: nil by mouth, total parenteral nutrition or a medium-chain triglyceride diet, and octreotide to reduce chyle flow, with most leaks closing within one to two weeks. Surgical ligation is reserved for high-output leaks persisting beyond five to seven days of conservative therapy.

Reference: Sabiston Textbook of Surgery, 21st ed.

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Written and medically reviewed by the StethoPrep medical team.