M. Conti, P. Merlani, and B. Ricou, Prognosis and quality of life of elderly patients after intensive care, Swiss Medical Weekly, vol.142, p.13671, 2012.
DOI : 10.4414/smw.2012.13671

M. Borel, B. Veber, F. Robillard, J. Rigaud, B. Dureuil et al., L???admission du sujet ??g?? en r??animation??: l?????ge influence-t-il l???acc??s aux soins???, Annales Fran??aises d'Anesth??sie et de R??animation, vol.27, issue.6, pp.472-80, 2008.
DOI : 10.1016/j.annfar.2008.03.015

L. Fried, C. Tangen, J. Walston, A. Newman, C. Hirsch et al., Frailty in Older Adults: Evidence for a Phenotype, The Journals of Gerontology Series A: Biological Sciences and Medical Sciences, vol.56, issue.3, pp.146-56, 2001.
DOI : 10.1093/gerona/56.3.M146

M. Escher, T. Perneger, and J. Chevrolet, National questionnaire survey on what influences doctors' decisions about admission to intensive care, BMJ, vol.329, issue.7463, p.425, 2004.
DOI : 10.1136/bmj.329.7463.425

URL : http://www.ncbi.nlm.nih.gov/pmc/articles/PMC514202

C. Sprung, A. Artigas, J. Kesecioglu, A. Pezzi, J. Wiis et al., The Eldicus prospective, observational study of triage decision making in European intensive care units. Part II, Critical Care Medicine, vol.40, issue.1, pp.132-140, 2012.
DOI : 10.1097/CCM.0b013e318232d6b0

A. Boumendil, D. Angus, A. Guitonneau, A. Menn, C. Ginsburg et al., Variability of Intensive Care Admission Decisions for the Very Elderly, PLoS ONE, vol.171, issue.4, p.34387, 2012.
DOI : 10.1371/journal.pone.0034387.t006

B. Guidet, D. Pateron, and A. Boumendil, Critères d'admission des personnes âgées en réanimation

S. Tripathy, J. Mishra, and S. Dash, Critically ill elderly patients in a developing world???mortality and functional outcome at 1 year: A prospective single-center study, Journal of Critical Care, vol.29, issue.3, pp.474-481, 2014.
DOI : 10.1016/j.jcrc.2014.01.007

A. Boumendil, E. Maury, R. I. Luquel, L. Offenstadt, G. Guidet et al., Prognosis of patients aged 80???years and over admitted in medical intensive care unit, Intensive Care Medicine, vol.30, issue.4, pp.647-54, 2004.
DOI : 10.1007/s00134-003-2150-z

M. Garrouste-orgeas, J. Timsit, L. Montuclard, A. Colvez, O. Gattolliat et al., Decision-making process, outcome, and 1-year quality of life of octogenarians referred for intensive care unit admission, Intensive Care Medicine, vol.28, issue.7, pp.1045-51, 2006.
DOI : 10.1111/j.1532-5415.1991.tb04452.x

E. Parmentier-decrucq, Crit??res d???admission en r??animation des personnes ??g??es de plus de 80ans, NPG Neurologie - Psychiatrie - G??riatrie, vol.13, issue.78, pp.327-330, 2013.
DOI : 10.1016/j.npg.2013.08.001

M. Capuzzo, R. Moreno, and B. Jordan, Predictors of early recovery of health status after intensive care, Intensive Care Medicine, vol.33, issue.11, pp.1832-1840, 2006.
DOI : 10.1136/bmj.316.7133.736

A. Boumendil, A. Latouche, B. Guidet, and I. Group, On the Benefit of Intensive Care for Very Old Patients, Archives of Internal Medicine, vol.171, issue.12, pp.1116-1123, 2011.
DOI : 10.1001/archinternmed.2011.102

H. Flaaten and M. Garrouste-orgeas, The very old ICU patient: a never-ending story, Intensive Care Medicine, vol.58, issue.7, pp.1996-1998, 2015.
DOI : 10.1111/aas.12211

D. Heyland, A. Garland, and S. Bagshaw, Recovery after critical illness in patients aged 80??years or older: a multi-center prospective observational cohort study, Intensive Care Medicine, vol.42, issue.1, 1911.
DOI : 10.1097/CCM.0000000000000227

D. Heyland, D. Cook, and S. Bagshaw, The Very Elderly Admitted to ICU, Critical Care Medicine, vol.43, issue.7, pp.1352-60, 2015.
DOI : 10.1097/CCM.0000000000001024

F. Ferreira, D. Bota, A. Bross, C. Mélot, and J. Vincent, Serial Evaluation of the SOFA Score to Predict Outcome in Critically Ill Patients, JAMA, vol.286, issue.14, pp.1754-58, 2001.
DOI : 10.1001/jama.286.14.1754

J. Lecharny and P. Loirat, « Ethique et réanimation du sujet âgé » Conférences d'actualisation 1997, pp.545-53, 1997.

B. Dalens, Traité d'anesthésie générale, 2001.

L. Fried, N. Borhani, P. Enright, C. Furberg, and J. Gardin, The cardiovascular health study: Design and rationale, Annals of Epidemiology, vol.1, issue.3, pp.263-276, 1991.
DOI : 10.1016/1047-2797(91)90005-W

X. Song, A. Mitnitski, and K. Rockwood, Prevalence and 10-Year Outcomes of Frailty in Older Adults in Relation to Deficit Accumulation, Journal of the American Geriatrics Society, vol.42, issue.4, pp.681-687, 2010.
DOI : 10.1016/j.mad.2006.01.002

B. Santos-eggimann, P. Cuenoud, J. Spagnoli, and J. Junod, Prevalence of frailty in middleaged and older community-dwelling Europeans living in 10 countries, J Gerontol A Biol Sci Med Sci, vol.64, pp.675-681, 2009.

A. Clegg, J. Young, S. Iliffe, M. Rikkert, and K. Rockwood, Frailty in elderly people, The Lancet, vol.381, issue.9868, pp.752-762, 2013.
DOI : 10.1016/S0140-6736(12)62167-9

Y. Rolland, A. Benetos, A. Gentric, J. Ankri, and F. Blanchard, Frailty in older population: a brief position paper from the French society of geriatrics and gerontology, Geriatr Psychol Neuropsychiatr Vieil, vol.9, pp.387-390, 2011.

K. Rockwood, X. Song, C. Macknight, H. Bergman, and D. Hogan, A global clinical measure of fitness and frailty in elderly people, Canadian Medical Association Journal, vol.173, issue.5, pp.489-495, 2005.
DOI : 10.1503/cmaj.050051

S. Bagshaw, H. Stelfox, R. Mcdermid, D. Rolfson, R. Tsuyuki et al., Association between frailty and short- and long-term outcomes among critically ill patients: a multicentre prospective cohort study, Canadian Medical Association Journal, vol.186, issue.2, pp.95-102, 2014.
DOI : 10.1503/cmaj.130639

URL : http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3903764

L. Maguet, P. Roquilly, A. Lasocki, S. Asehnoune, K. Carise et al., Prevalence and impact of frailty on mortality in elderly ICU patients: a prospective, multicenter, observational study, Intensive Care Medicine, vol.29, pp.674-682, 2014.
DOI : 10.1007/s00134-003-1763-6

URL : https://hal.archives-ouvertes.fr/hal-01009763

J. Kass, R. Castriotta, and F. Malakoff, Intensive care unit outcome in the very elderly, Critical Care Medicine, vol.20, issue.12, pp.1666-71, 1992.
DOI : 10.1097/00003246-199212000-00011

L. Montuclard, M. Garrouste-orgeas, J. Timsit, B. Misset, D. Jonghe et al., Outcome, functional autonomy, and quality of life of elderly patients with a long-term intensive care unit stay, Critical Care Medicine, vol.28, issue.10, pp.3389-95, 2000.
DOI : 10.1097/00003246-200010000-00002

V. Roche, A. Kramer, E. Hester, and C. Welsh, Long-Term Functional Outcome After Intensive Care, Journal of the American Geriatrics Society, vol.13, issue.1, pp.18-24, 1999.
DOI : 10.1007/BF01708401

W. Sage, C. Hurst, J. Silverman, and W. Bortz, Intensive Care for the Elderly: Outcome of Elective and Nonelective Admissions, Journal of the American Geriatrics Society, vol.309, issue.4, pp.312-330, 1987.
DOI : 10.1056/NEJM198310063091411

S. Bagshaw, S. Webb, and A. Delaney, Very old patients admitted to intensive care in Australia and New Zealand: a multi-centre cohort analysis, Critical Care, vol.13, issue.2, p.45, 2009.
DOI : 10.1186/cc7768

A. Boumendil, D. Angus, A. Guitonneau, A. Menn, C. Ginsburg et al., Variability of Intensive Care Admission Decisions for the Very Elderly, PLoS ONE, vol.171, issue.4, p.34387, 2012.
DOI : 10.1371/journal.pone.0034387.t006

D. Clarke, M. Goldstein, and T. Raffin, Ethical Dilemmas in the Critically Ill Elderly, Clinics in Geriatric Medicine, vol.10, pp.91-101, 1994.

M. Hamel, J. Lynn, J. Teno, K. Covinsky, A. Wu et al., Age-Related Differences in Care Preferences, Treatment Decisions, and Clinical Outcomes of Seriously Ill Hospitalized Adults: Lessons from SUPPORT, Journal of the American Geriatrics Society, vol.312, issue.Suppl, pp.176-82, 2000.
DOI : 10.1136/bmj.312.7032.670

A. Boumendil, P. Aegerter, B. Guidet, and C. Network, Treatment Intensity and Outcome of Patients Aged 80 and Older in Intensive Care Units: A Multicenter Matched-Cohort Study, Journal of the American Geriatrics Society, vol.357, issue.1, pp.88-93, 2005.
DOI : 10.1001/archinte.1962.03620240029006

M. Hamel, R. Davis, and J. Teno, Older Age, Aggressiveness of Care, and Survival for Seriously Ill, Hospitalized Adults, Annals of Internal Medicine, vol.131, issue.10, pp.721-729, 1999.
DOI : 10.7326/0003-4819-131-10-199911160-00002

O. Baert, Mortalité et qualité de vie à un an des sujets hospitalisés en réanimation chirurgicale du CHU de Rouen, Thèse pour le doctorat en médecine soutenue publiquement en, 2006.

A. Leboucher, Facteurs prédictifs de mortalité des patients de plus de 80 ans hospitalisés en réanimation: étude rétrospective sur deux ans, Thèse pour le doctorat en médecine soutenue publiquement en 2013

T. Raveau, C. Annweiler, N. Chudeau, S. Gergaud, S. Thiery et al., Comprehensive geriatric assessment in intensive care unit: a pilot study (pre-Seniorea), Geriatrie Et Psychologie Neuropsychiatrie Du Vieillissement, vol.11, pp.389-95, 2013.