Anaesthesia Nitrous oxide is contraindicated in patients with pneumothorax, pneumo pericardium or intestinal obstruction, because it: A Depresses an already compromised myocardium B Permits the use of a limited FIO2 only C Is less soluble than nitrogen D Causes the expansion of air filled body cavities 💡 Explanation Nitrous oxide is contraindicated in patients with pneumothorax, pneumo pericardium or intestinal obstruction, because it: ✓ Correct Answer: D. Causes the expansion of air filled body cavities