1. Meleis AI. Theoritical nursing development and progress. 4 ed: Philadelphia: JB Lippinctt Co; 2007. 2. McEwen M, Willis E. Theoretical basic for nursing. editor: Lippincott Williams & Wilkins; 2006. 3. Karaöz S. Turkish nursing students' perception of caring. Nurse Educ Today. 2005;25(1):31-40. 4. Pajnkihar M. Is caring a lost art in nursing? Int J Nurs Stud. 2008;45(5):807-8. 5. Ghafari S, Mohammadi F. Concept analysis of care: A hybrid model. Journal of Mazandaran University of Medical Sciences. 2012;21(Supplement 1):153-64.(Persian) 6. Bench S, Crowe D, Day T, Jones M, Wilebore S. Developing a competency framework for critical care to match patient need. Intensive Crit Care Nurs. 2003;19(3):136-42. 7. Gill FJ, Leslie GD, Grech C, Latour JM. A review of critical care nursing staffing, education and practice standards. Aust Crit Care. 2012. 8. Fulbrook P. Critical care or intensive care? Conn work crit care nurse. 2010;7(2):107. 9. Berner KH, Ives G, Astin F. Critical care nurses' perceptions about their involvement in significant decisions regarding patient care. Aust Crit Care. 2004;17(3):123-31. 10. Riba AL. Evidence-based performance and quality improvement in the acute cardiac care setting. Crit Care Clin. 2008;24(1):201-29. 11. Manias E, Street A. The interplay of knowledge and decision making between nurses and doctors in critical care. Int J Nurs Stud. 2001;38(2):129-40. 12. Driscoll A, Currey J, George M, Davidson PM. Changes in health service delivery for cardiac patients: Implications for workforce planning and patient outcomes. Aust Crit Care. 2012;26(2):55-7 . 13. Maccance T, Mackenna H, Boone J. Caring: theoretical perspectives of relevance to nursing. J Adv Nurs. 1999;30(6):1388-95. 14. Corbin J, Strauss A. Basics of Qualitative Reseach: Techniques and Procedures for Developing Grounded Theory. Los Angeles: SAGE publication; 2008. 15. Lingard L, Albert M, Levinson W. Grounded theory, mixed methods, and action research. BMJ. 2008;337:a567. 16. Sinuff T, Cook DJ, Giacomini M. How qualitative research can contribute to research in the intensive care unit. J Crit Care. 2007;22(2):104-11. 17. Morse JM, Barrett M, Mayan M, Olsen K, Spiers. Verification strategies for establishing reliability and validity in qualitative research. International Journal of Qualitative Methods 1, Article 2.: 2002 Retrieved February 8, 2003 from http://www.ualberta.- ca/_ijqm/. 18. Strauss A, Corbin J. Basics of Qualitative Research: Grounded Theory Procedures and Technique Edition, Newbury Park, London: Sage; 1998. 19. Katz JN, Shah BR, Volz EM, Horton JR, Shaw LK, Newby LK, et al. Evolution of the coronary care unit: clinical characteristics and temporal trends in healthcare delivery and outcomes. Crit Care Med. 2010;38(2):375-81. 20. Herlitz J, Dellborg M, Karlsson T, Evander MH, Berger A, Luepker R. Epidemiology of acute myocardial infarction with the emphasis on patients who did not reach the coronary care unit and non-AMI admissions. Int J Cardiol. 2008;128(3):342-9. 21. Aäri RL, Tarja S, Helena LK. Competence in intensive and critical care nursing: a literature review. Intensive Crit Care Nurs. 2008;24(2):78-89. 22. Ashghali-farahani M, Mohammadi E, Ahmadi F, Maleki M, Hajizadeh E. Obstacles of patient education in CCU and post CCU:A grounded theory study. Iran journal of nursing (IJN). 2009;22(58):55-73. 23. Slade D, Scheeres H, Manidis M, Iedema R, Dunston R, Stein-Parbury J, et al. Emergency communication: the discursive challenges facing emergency clinicians and patients in hospital emergency departments. Discourse & Communication. 2008;2(3):271-98. 24. Williams S, Ogle KR, Leslie G, Committee ACoCCNWPA. ACCCN national nursing workforce survey of intensive care units. Aust Crit Care. 2001;14(2):50-4. 25. Darvas JA, Hawkins LG. What makes a good intensive care unit: a nursing perspective. Aust Crit Care. 2002;15(2):77-82. 26. Friedrich B. Staying power. Nurs Manage. 2001;32(7):26-8. 27. Letvak S. Retaining the older nurse. J Nurs Adm. 2002;32(7-8):387-92. 28. Bruhn JG. Being good and doing good: the culture of professionalism in the health professions. Health Care Manag (Frederick). 2001;19(4):47-58. 29. Pinkerton S. The Future of Professionalism in Nursing. Available at: http://findarticles.com/p/articles/mi_m0FSW/is_319/ai_n18612039.2008 [cited Accessed July 11, 2011. 30. Mahmodi shen G, Alhani F, Ahmadi F, Kazemneghad A. Ethics in life style of nursing proffesion: A qualitative research in deductive content analysisi. Journal of medical ethics and history of medicine. 2009;2(4):63-78.(Persian) 31. MacIntosh J. Reworking professional nursing identity. West J Nurs Res. 2003;25(6):725-41; discussion 42-5. 32. Nedd N. Perceptions of empowerment and intent to stay. Nurs Econ. 2006;24(1):13-8, 3. 33. Memarian R, Salsali M, Vanaki Z, Ahmadi F, Hajizadeh E. Factors affecting the process of obtaining clinical competency. Journal of Zanjan university of medical sciences and health services. 2006;14(56):40-9. (Persian) 34. Donald F, Bryant-Lukosius D, Martin-Misener R, Kaasalainen S, Kilpatrick K, Carter N, et al. Clinical nurse specialists and nurse practitioners: title confusion and lack of role clarity. Nurs Leadersh (Tor Ont). 2010;23 Spec No 2010:189-201. 35. Bagheri Nsamy M, Rafii F, Parvizi S, Smaili R. Analysis of the concept of competence in nursing: Qualitative research is a hybrid model. Journal of Mazandaran University of Medical Sciences. 2008;18(67):35-42. (Persian) 36. Arvidsson B, Fridlund B. Factors influencing nurse supervisor competence: a critical incident analysis study. J Nurs Manag. 2005;13(3):231-7. 37. Nobahar M. Care quality in critical cardiac unit from nurses prospective: Content analysis. J Qual Res Health Sci. 2014;In press.(Persian) 38. Asgari M, Soleimani M. Comprehensive book Intensive Nursing Care in ICU, CCU and Dialysis ward. 21, editor. Tehran: Boshra; 2013. (Persian) 39. Van Bogaert P, Kowalski C, Weeks SM, Van Heusden D, Clarke SP. The relationship between nurse practice environment, nurse work characteristics, burnout and job outcome and quality of nursing care: A cross-sectional survey. Int J Nurs Stud.2013; 50(12):1667-77. 40. Clarke SP. Nurse staffing and patient outcomes: getting to the heart of the matter in research, practice, and policy. Pa Nurse. 2008;63(4):8-9. 41. nobahar M. Principles & arts of nursing. ed, editor. Tehran: Boshra; 2012.(Persian). 42. Person SD, Allison JJ, Kiefe CI, Weaver MT, Williams OD, Centor RM, et al. Nurse staffing and mortality for Medicare patients with acute myocardial infarction. Med Care. 2004;42(1):4-12. 43. Schubert M, Glass TR, Clarke SP, Aiken LH, Schaffert-Witvliet B, Sloane DM, et al. Rationing of nursing care and its relationship to patient outcomes: the Swiss extension of the International Hospital Outcomes Study. Int J Qual Health Care. 2008;20(4):227-37. 44. Schubert M, Clarke SP, Glass TR, Schaffert-Witvliet B, De Geest S. Identifying thresholds for relationships between impacts of rationing of nursing care and nurse- and patient-reported outcomes in Swiss hospitals: a correlational study. Int J Nurs Stud. 2009;46(7):884-93.