title: Failure of open-heart massage to improve survival after prehospital nontraumatic cardiac arrest.
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D006323:Heart Arrest / Q000401:mortality / Q000628:therapy*; D006336:Heart Massage / Q000379:methods*; D006801:Humans; D008875:Middle Aged; D011446:Prospective Studies; D011897:Random Allocation; D013903:Thoracic Surgery