Left Pneumonectomy: COPD & One-Lung Ventilation (OLV)
Thoracic logic involving quantitative PFT interpretation, hypoxic pulmonary vasoconstriction, and acute-on-chronic respiratory failure.
"A 64 y.o. female with COPD and a 50 pack-year smoking history presents for a left pneumonectomy. Pre-op PFTs show an FEV1 of 1.2L (45% predicted) and a DLCO of 50%. She is currently on room air. Induction is planned with a double-lumen tube..."
Evaluation of pulmonary reserve, management of hypoxemia during one-lung ventilation (One-Lung Ventilation (OLV)), and the 'FEV1 < 40%' rule.
Defend your management of hypoxic pulmonary vasoconstriction (HPV) while navigating the hemodynamics of the open chest and tenuous lung mechanics.
How a Board-Certified Consultant answers this scenario.
Managing a left pneumonectomy in a patient with limited cardiac reserve requires precise control of one-lung ventilation (One-Lung Ventilation (OLV)) and right heart function. My first priority is securing the airway with a left-sided double-lumen tube (Double Lumen Tube (DLT)) or a bronchial blocker, confirmed by fiberoptic bronchoscopy.
If the patient becomes hypoxic during One-Lung Ventilation (OLV), I will systematically troubleshoot: first, I'll confirm Double Lumen Tube (DLT) position and increase FiO2 to 100%. Next, I'll apply 5-10 cmH2O of Continuous Positive Airway Pressure (CPAP) to the non-dependent (collapsed) lung to improve oxygenation without obstructing the surgical field. I will maintain a protective ventilation strategy for the dependent lung (5-6 mL/kg TV) and keep the MAP within a narrow range to maintain cerebral and renal perfusion. I will avoid fluid overload to prevent 'post-pneumonectomy pulmonary edema' and monitor the pulmonary artery pressures carefully given his mild baseline hypertension.