Pharmacology Nitrous oxide is contraindicated in patients with pneumothorax, pneumopericardium or intestinal obstruction because it : A Depresses an already compromised myocardium B Permits the use of 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, pneumopericardium or intestinal obstruction because it : ✓ Correct Answer: D. Causes the expansion of air filled body cavities