PE with V/Q mismatch

Unilateral absent lung perfusion for Perfusion worse than Ventilation
• External compression (bronchogenic CA, fibrosing mediastinitis)
• Pulmonary artery anomalies or corrected congenital heart disease

Massive unilateral PE for Ventilation worse than Perfusion
• Mucus plug
• Unilateral diffuse parenchymal disease
• Endobronchial lesion (mass or foreign body)


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