Lung Function After Surgery: Risks, Complications & Recovery

Complete, unplanned cessation of lung function after surgery is not a typical or expected outcome. However, pulmonary complications are among the most common postoperative adverse events.

Common Postoperative Pulmonary Complications (PPCs)

• Atelectasis: Collapse of alveoli (most common); from shallow breathing, pain, opioids, supine position. → Hypoxemia.
• Pneumonia: Aspiration, impaired clearance, immune suppression. Risk ↑ with abdominal/thoracic surgery, age, COPD.
• Respiratory failure: Inability to oxygenate/ventilate; may require reintubation.
• Pleural effusion: Fluid accumulation; often asymptomatic.
• Pneumothorax: Air in pleural space; from central line, biopsy, or barotrauma.
• Exacerbation of underlying lung disease: COPD, asthma, fibrosis.

High-Risk Surgeries

Thoracic, upper abdominal, neurosurgical, prolonged (>3 hrs), emergency, in patients with COPD, obesity, smoking, heart failure, neuromuscular disease.

Prevention & Management

• Preoperative: Smoking cessation (≥4 wks), optimize COPD/asthma, inspiratory muscle training.
• Intraoperative: Lung-protective ventilation (low tidal volume, PEEP), fluid restriction, regional anesthesia when possible.
• Postoperative: Early mobilization, incentive spirometry, CPAP/BiPAP for at-risk, adequate analgesia (epidural, PCA), pulmonary toilet, DVT prophylaxis.

Lung resection/transplant are unique: planned single-lung ventilation, postoperative ventilatory support expected. But "lungs stopping" without planning is a catastrophic complication (e.g., massive PE, anaphylaxis, anesthetic crisis)—not routine.