The MEOPA is used to obtain an analgesia of the short-term painful acts. To the population of elderly patients, the therapeutic resources to control the passing pain require in their manipulation a certain caution and are not divested of side effects badly tolerated at this age. An alternative in the opioid presents all its interest. The MEOPA is here an alternative of choice in the care of these pains, in particular in case of pre-existent cognitive achievement, of polypathologies or of polymédication.