<prompt> Nitrous oxide is contraindicated in patients with pneumothorax, pneumopericardium or intestinal obstruction because it :Depresses an already compromised myocardiumPermits the use of limited FIO2 onlyIs less soluble than nitrogenCauses the expansion of air filled body cavities  <response>: N2O use is contraindicated in pneumothorax and volvulus because it may lead to the development of high pressure in the closed cavities in the body like an obstructed loop of bowel, intraocular air bubble, a pulmonary bulla, pneumothorax, obstructed middle ear, air embolus, intracranial air and pneumoperitoneum. 