One of the four principles of modern medical ethics is to honor the principle known as patient participation in decision-making related to their own treatment. Euthanasia or "Mercy Killing" refers to the practice as helping a person experiencing a quiet, pain free and comfortable death. Due to the subject being important and few studies available in this area, the current study has been designed, which is a systematic narrative review. Using keyword search about the title or abstract in the databases like Magiran, SID, Medline, Iranmedex for Persian language studies and the articles with their full text in English on the databases as ProQuest, Elsevier, Ovid, PubMed, Science direct using the following key words, the search was done. The Persian words included favorable death, sweet death, good death, easy death. The key words in English language covered Mercy killing, Easy death, Euthanasia with the individual terms aging, older people and the elderly. After searching the available databases with the appropriate key words in two languages as Persian and English and with no time limitation, 56 articles have been obtained. Out of these ones, 38 articles have been selected and analyzed as the most relevant to our desired objectives. The identical studies were excluded and or integrated as much as possible at the investigator's discretion. All those dealing with the dying patients have to be equipped with enough skill and access the sophisticated consultants in the symptomatic treatment and take the due actions, if necessary. Knowing a society health care providers' attitude towards the issue called euthanasia, it is possible to take effective actions through a well-established planning in order to promote the care of the patients about whom euthanasia is set forth.

Attachment styles are the effective elements in the formation and posing any question about the problems of aging and how to deal with these issues. This study aimed to review attachment styles and its associated factors in the elderly. Using keyword search about the title or abstract in the databases like Magiran, SID, Medlib, Iranmedex, Google Scholar for Persian language studies and the articles with their full text in English on the databases as Proquest Elsevier, Ovid, PubMed, Science direct, Google Scholar using the following key words in both Persian English, the search was done. The key words covered Attachment model, Attachment style, Attachment pattern, with the individual terms, aging, elder, aged, old people elderly. Out of these ones, during 2000 and end of the 2016, 83 articles in the field of attachment style in the elderly group with 60 years old and older, were extracted. Of these, 19 articles were selected as most relevant to our objectives and were examined. The results showed that insecure attachment style was closely related to the increasing number of problems of the elderly in this period. Some studies reported the score of safe attachment style in the elderly living at home higher than the elderly living in nursing homes. The avoidant or anxious attachment styles were common patterns among the residents of nursing homes. There was a significant relationship between attachment patterns and chronic diseases and sleep problems in the elderly. The pattern of attachment has an effective role in decision-making, depression and anxiety in the elderly. The attachment styles are also influenced by gender. Secure attachment style has increased by expanding the communication with the elderly. The findings of the studies showed that attachment styles can predict elderly happiness, self-esteem and self-care behaviors associated with strong attachment styles dimensions. Improving the communication with family and living at home beside the family are effective in the correct pattern of attachment, and this improvement can help to prevent many diseases related to the mental status of elderly people.