(1992) International statistical classification of diseases and related health problems. 10th Rev, Vol. 2, World Health Organization, Geneva, 98-99.
 Ministry of Health and Family Welfare (2011) NRHM health management Information system (HMIS) portals.
 Soubra, S.H. and Guntupalli, K.K. (2005) Critical illness in pregnancy: An overview. Critical Care Medicine, 33, S248-S255.
 Karnad, D.R. and Guntupalli, K.K. (2004) Critical illness and pregnancy: Review of a global problem. Critical Care Clinics, 20, 555-576.
 Vasquez, D.N., Estenssoro, E., Canales, H.S., Reina, R., Saenz, M.G., Das Neves, A.V., Toro, M.A. and Loudet, C.I. (2007) Clinical characteristics and outcomes of obstetric patients requiring ICU admission. Chest, 131, 718-724. http://dx.doi.org/10.1378/chest.06-2388
 Al-Suleiman, S.A., Qutub, H.O., Rahman, J. and Rahman, M.S. (2006) Obstetric admissions to the intensive care unit: A 12 year review. Archives of Gynecology and Obstetrics, 274, 4-8.
 Munnur, U., Karnad, D.R., Bandi, V.D., Lapsia, V., Suresh, M.S., Ramshesh, P., et al. (2005) Critically ill obstetric patients in an American and an Indian public hospital: Comparison of case mix organ dysfunction, intensive care requirements and outcomes. Intensive Care Medicine, 31, 1087-1094.
 Tempe, A., Wadhwar, L., Gupta, S., Bansal, S. and Satyanarayana, L. (2007) Prediction of mortality and morbidity by simplifies acute physiology score (SAPS II) in obstetric ICU admissions. Indian Journal of Medical Sciences, 61, 179-185.
 Vincent, J.L., Mendonca, A. and Cantraine, F. (1998) Use of the SOFA score to assess the incidence of organ dysfunction/failure in intensive care units: Results of a multicenter, prospective study. Critical Care Medicine, 26, 1793-1800.
 Karnad, D.R., Lapsia, V., Krishnan, A. and Salvi, V.S. (2004) Prognostic factors in Obstetric patients admitted to an Indian intensive care unit. Critical Care Medicine, 32, 1294-1299.
 Govt. of India (Sample Registration System) (2006) Maternal mortality in India: 1997-2003. Trends, causes and risk factors, registrar general, India, New Delhi in collaboration with Centre for Global Health Research University of Toronto, Canada.
 Gupta, S., Naithani, U., Doshi, V., Bhargava, V. and Vijay, B.S. (2011) Obstetric critical care: A prospective analysis of clinical characteristics, predictability and fetomaternal outcome in a new dedicated obstetric intensive care unit. Indian Journal of Anaesthesia, 55, 146-153.
 Ng, V.K., Lo, T.K., Tsang, H.H., Lau, W.L. and Leung, W.C. (2013) Intensive care unit admission of obstetric cases: A single centre experience with contemporary update. Hong Kong Medical Journal. www.hkmj.org
 Bhadade, R., de’ Souza, R., More, A. and Harde, M. (2012) Maternal outcomes in critically ill obstetrics patients: A unique challenge. Indian Journal of Critical Care Medicine, 16, 8-16.
 Aldawood, A. (2011) Clinical characteristics and outcomes of critically ill obstetric patients: A ten year review. Annals of Saudi Medicine, 31, 518-522.
 Simsek, T., Eyigor, C., Uyar, M., Karaman, S. and Moral, A.R. (2011) Retrospective review of critically ill obstetrical patients: A decade’s experience. Turkish Journal of Medical Sciences, 41, 1059-1064.
 Faponle, A.F. and Adenekan, A.T. (2011) Obstetric admissions into the intensive care unit in a sub-urban University Teaching Hospital. Nepal Journal of Obstetrics and Gynaecology, 6, 33-36.
 Rios, F.G., Risso-Vazquez, A., Alvaez, J., Vinzio, M., Falbo, P., Rondinelli, N. and Bienzobas, D.H. (2012) Clinical characteristics and outcomes of obstetric patients admitted to the intensive care unit. International Journal of Gynecology & Obstetrics India, 15, 430-434.
 American College of Obstetricians and Gynaecologists (ACOG) (2009) Critical care in pregnancy. Washington DC: American College of Obstetricians and Gynaecologists.
 WHO (2012) Trends in maternal mortality: 1990 to 2010 WHO, UNICEF, UNFPA and The World Bank estimates.
 Orsini, J., Butala, A., Diaz, L., Muzylo, E., Mainardi, C. and Kestell, P. (2012) Clinical profile of obstetric patients admitted to the Medical Surgical Intensive Care Unit (MSICU) of an Inner-City Hospital in New York. Journal of Clinical Medicine Research, 4, 314-317.
 Leung, N.Y., Lau, A.C., Chen, K.K. and Yan, W.W. (2010) Clinical characteristics and outcomes of obstetric patients admitted to the Intensive Care Unit: A 10 year retrospective review. Hong Kong Medical Journal, 16, 18-25.
 El-Sohl, A.A. and Grant, B.J. (1996) A comparison of severity of illness scoring systems for critically ill obstetric patients. Chest, 110, 1299-1304.
 Koopmans, C.M., Bijlenga, D., Groen, H., Vigen, S.M., Aarnoudse, J.G., for the HYPITAT Study Group (2009) Induction of labour versus expectant monitoring for gestational hypertension or mild pre-eclampsia after 36 weeks gestation (HYPITAT): A multicentre, open label randomized controlled trial. Lancet, 374, 979-988.