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Objective: Our objective was to determine and describe the opinion and attitudes of patients and their families regarding the limitation of therapeutic effort and advanced directives in critical patients and whether end-of-life planning occurs. Religious affiliation, education level, and pre-admission quality of life were also evaluated to determine whether they may influence decisions regarding appropriate therapeutic effort. Methods: A prospective, observational and descriptive study, approved by the center's ethical committee, was carried out with 257 participants (94 patients and 163 family members) in the intensive care unit (ICU). A questionnaire regarding the opinions of patients and relatives about situations of therapeutic appropriateness in case of poor prognosis or poor quality of life was used. The questionnaire had three sections. In the first section, sociodemographic features were investigated. In the second section, information was collected on the quality of life and functional situation before ICU admission (taking as a reference the situation one month before admission) assessed by the Karnofsky scale, Barthel index, and the PAEEC scale (Project for the Epidemiological Analysis of Critical Care Patients). The third section aimed to determine whether the family knew the patient's opinion regarding his/her end of life. Results: Of those interviewed, 62.2% would agree to limit treatment in case of poor prognosis or poor quality of future life. In contrast, 37.7% considered that they should fight for life, even if it is irretrievable. Only 1.6% had advanced directives registered, 43.9% of the participants admitted deterioration in their quality of life before ICU admission, 18.2% with moderate-severe deterioration. Our study shows that the higher the educational level, the lower the desire to fight for life when it is irretrievable and the greater the agreement to limit treatment. Besides, those participants not affiliated with a religion were significantly less likely to fight for life, including when irretrievable, than Catholics and were more likely to agree to limit treatment. Conclusions: More than half of the participants would agree to limit treatment in the case of a poor prognosis. Our results indicate that patients do not prepare for the dying process well in advance. Religion and educational level were determining factors for the choice of procedures at the end of life, both for patients and their families. [ABSTRACT FROM AUTHOR]