Surgery A patient is presented with a gunshot wound on 4th intercostal space producing pneumothorax. The suction pressure needed for drainage is A Less than 5cm H2O B 10 cm H2O C 20 cm H2O D 50 cm H2O 💡 Explanation A patient is presented with a gunshot wound on 4th intercostal space producing pneumothorax. The suction pressure needed for drainage is ✓ Correct Answer: C. 20 cm H2O