1. Say L, Chou D, Gemmill A, Tunçalp Ö, Moller AB, Daniels J, et al. Global causes of maternal death: A WHO systematic analysis. Lancet Glob Heal. 2014;2(6):323–33.
2. Nair M, Choudhury MK, Choudhury SS, Kakoty SD, Sarma UC, Webster P, et al. Association between maternal anaemia and pregnancy outcomes: A cohort study in Assam, India. BMJ Glob Heal [Internet]. 2016 Apr 7 [cited 2018 Jan 29];1(1):e000026. Available from: http://gh.bmj.com/lookup/doi/10.1136/bmjgh-2015-000026
3. Parks S, Hoffman MK, Goudar SS, Patel A, Saleem S, Ali SA, et al. Maternal anaemia and maternal, fetal, and neonatal outcomes in a prospective cohort study in India and Pakistan. BJOG An Int J Obstet Gynaecol. 2019 May 1;126(6):737–43.
4. Stevens GA, Finucane MM, De-Regil LM, Paciorek CJ, Flaxman SR, Branca F, et al. Global, regional, and national trends in haemoglobin concentration and prevalence of total and severe anaemia in children and pregnant and non-pregnant women for 1995-2011: A systematic analysis of population-representative data. Lancet Glob Heal [Internet]. 2013 Sep 1 [cited 2020 Aug 13];1(1):e16–25. Available from: www.thelancet.com/lancetgh
5. Daru MBBS J, Zamora J, Thangaratinam S, Khan KS, Epidemiology C, Health P, et al. Risk of maternal mortality in women with severe anaemia during pregnancy and post partum: a multilevel analysis. Lancet Glob Heal [Internet]. 2018 [cited 2020 Aug 13];6:e548–54. Available from: www.thelancet.com/lancetgh
6. Guignard J, Deneux-Tharaux C, Seco A, Beucher G, Kayem G, Bonnet MP, et al. Gestational anaemia and severe acute maternal morbidity: a population-based study. Anaesthesia. 2021 Jan 1;76(1):61–71.
7. World Health Organization. WHO recommendations for the prevention and treatment of postpartum haemorrhage [Internet]. 2017 [cited 2018 Jan 26]. Available from: http://www.who.int/reproductivehealth/publications/tranexamic-acid-pph-treatment/en/
8. World Health Organization (WHO). The Prevention and Management of Postpartum Haemorrhage [Internet]. 1989 [cited 2020 Aug 13]. Available from: https://apps.who.int/iris/bitstream/handle/10665/61409/WHO_MCH_90.7.pdf
9. Meher S, Cuthbert A, Kirkham J, Williamson P, Abalos E, Aflaifel N, et al. Core outcome sets for prevention and treatment of postpartum haemorrhage: an international Delphi consensus study. BJOG An Int J Obstet Gynaecol [Internet]. 2018 Jul 29 [cited 2018 Aug 23]; Available from: http://doi.wiley.com/10.1111/1471-0528.15335
10. Ker K, Roberts I, Chaudhri R, Fawole B, Beaumont D, Balogun E, et al. Tranexamic acid for the prevention of postpartum bleeding in women with anaemia: study protocol for an international, randomised, double-blind, placebo-controlled trial. Trials [Internet]. 2018 Dec 29 [cited 2019 Feb 6];19(1):712. Available from: https://trialsjournal.biomedcentral.com/articles/10.1186/s13063-018-3081-x
11. ICH. Harmonised Tripartite Guideline E9 Statistical Principles for Clinical Trials. 1998.
12. Brenner A, Arribas M, Cuzick J, Jairath V, Stanworth S, Ker K, et al. Outcome measures in clinical trials of treatments for acute severe haemorrhage. Trials [Internet]. 2018 Dec 1 [cited 2018 Oct 9];19(1):533. Available from: https://trialsjournal.biomedcentral.com/articles/10.1186/s13063-018-2900-4
13. Copeland KT, Checkoway H, Mcmichael AJ, Holbrook RH. Bias due to misclassification in the estimation of relative risk. Am J Epidemiol [Internet]. 1977 [cited 2020 Nov 18];105(5):488–95. Available from: https://pubmed.ncbi.nlm.nih.gov/871121/
14. Pacagnella RC, Souza JP, Durocher J, Perel P, Blum J, Winikoff B, et al. A Systematic Review of the Relationship between Blood Loss and Clinical Signs [Internet]. Vol. 8, PLoS ONE. PLoS One; 2013 [cited 2020 Aug 6]. Available from: https://pubmed.ncbi.nlm.nih.gov/23483915/
15. El Ayadi AM, Nathan HL, Seed PT, Butrick EA, Hezelgrave NL, Shennan AH, et al. Vital Sign Prediction of Adverse Maternal Outcomes in Women with Hypovolemic Shock: The Role of Shock Index. Raju R, editor. PLoS One [Internet]. 2016 Feb 22 [cited 2020 Aug 6];11(2):e0148729. Available from: https://dx.plos.org/10.1371/journal.pone.0148729
16. Nathan HL, El Ayadi A, Hezelgrave NL, Seed P, Butrick E, Miller S, et al. Shock index: An effective predictor of outcome in postpartum haemorrhage? BJOG An Int J Obstet Gynaecol. 2015 Jan 1;122(2):268–75.
17. Le Bas A, Chandraharan E, Addei A, Arulkumaran S. Use of the “obstetric shock index” as an adjunct in identifying significant blood loss in patients with massive postpartum hemorrhage. Int J Gynecol Obstet. 2014;124(3):253–5.
18. Vricella LK, Louis JM, Chien E, Mercer BM. Blood volume determination in obese and normal-weight gravidas: The hydroxyethyl starch method. In: American Journal of Obstetrics and Gynecology [Internet]. Mosby Inc.; 2015 [cited 2020 Aug 13]. p. 408.e1-408.e6. Available from: /pmc/articles/PMC4589161/?report=abstract
19. Dupont C, Touzet S, Colin C, Deneux-Tharaux C, Rabilloud M, Clement HJ, et al. Incidence and management of postpartum haemorrhage following the dissemination of guidelines in a network of 16 maternity units in France. Int J Obstet Anesth. 2009;
20. Anger H, Durocher J, Dabash R, Winikoff B. How well do postpartum blood loss and common definitions of postpartum hemorrhage correlate with postpartum anemia and fall in hemoglobin? PLoS One [Internet]. 2019 [cited 2020 Aug 13];14(8). Available from: /pmc/articles/PMC6705817/?report=abstract
21. Yefet E, Yossef A, Suleiman A, Hatokay A, Nachum Z. Hemoglobin drop following postpartum hemorrhage. Sci Rep [Internet]. 2020;10(1):1–8. Available from: https://doi.org/10.1038/s41598-020-77799-0
22. Roubinian NH, Plimier C, Woo JP, Lee C, Bruhn R, Liu VX, et al. Effect of donor, component, and recipient characteristics on hemoglobin increments following red blood cell transfusion. Blood [Internet]. 2019 Sep 26 [cited 2021 Jun 3];134(13):1003–13. Available from: www.ahrq.gov/data/hcup
23. Perel A. Iatrogenic hemodilution: A possible cause for avoidable blood transfusions? Vol. 21, Critical Care. BioMed Central Ltd.; 2017. p. 291.
24. Sentilhes L, Marie-Victoire senat, Le Lous M, Winer N, Rozenberg P, Kayem G, et al. Tranexamic acid for the prevention of postpartum hemorrhage after cesarean delivery: the TRAAP2 trial. Am J Obstet Gynecol [Internet]. 2021 Feb 1 [cited 2021 Feb 19];224(2):S1. Available from: http://www.ajog.org/article/S0002937820314794/fulltext
25. Diaz V, Abalos E, Carroli G. Methods for blood loss estimation after vaginal birth [Internet]. Vol. 2018, Cochrane Database of Systematic Reviews. John Wiley and Sons Ltd; 2018 [cited 2020 Sep 30]. Available from: /pmc/articles/PMC6513177/?report=abstract
26. Hiscock R, Kumar D, Simmons SW. Systematic review and meta-analysis of method comparison studies of Masimo pulse co-oximeters (Radical-7TM or Pronto-7TM) and HemoCue® absorption spectrometers (B-Hemoglobin or 201+) with laboratory haemoglobin estimation. Anaesth Intensive Care [Internet]. 2015 May 1 [cited 2020 Aug 19];43(3):341–50. Available from: https://pubmed.ncbi.nlm.nih.gov/25943608/
27. Ushida T, Kotani T, Imai K, Nakano-Kobayashi T, Nakamura N, Moriyama Y, et al. Shock Index and Postpartum Hemorrhage in Vaginal Deliveries: A Multicenter Retrospective Study. Shock [Internet]. 2021 Mar 1 [cited 2021 Jun 2];55(3):332–7. Available from: https://journals.lww.com/shockjournal/Fulltext/2021/03000/Shock_Index_and_Postpartum_Hemorrhage_in_Vaginal.8.aspx
28. Borovac-Pinheiro A, Pacagnella RC, Cecatti JG, Miller S, El Ayadi AM, Souza JP, et al. Postpartum hemorrhage: new insights for definition and diagnosis. Am J Obstet Gynecol [Internet]. 2018 Aug 1 [cited 2020 Oct 19];219(2):162–8. Available from: http://www.ajog.org/article/S0002937818302941/fulltext
29. Sentilhes L, Winer N, Azria E, Sénat M-V, Le Ray C, Vardon D, et al. Tranexamic Acid for the Prevention of Blood Loss after Vaginal Delivery. N Engl J Med [Internet]. 2018 Aug 23 [cited 2020 Aug 13];379(8):731–42. Available from: http://www.nejm.org/doi/10.1056/NEJMoa1800942
30. Watanabe T, Minakami H, Sakata Y, Matsubara S, Tamura N, Obara H, et al. Effect of labor on maternal dehydration, starvation, coagulation, and fibrinolysis. J Perinat Med [Internet]. 2001 [cited 2021 Jun 7];29(6):528–34. Available from: https://pubmed.ncbi.nlm.nih.gov/11776684/
31. PRITCHARD JA. CHANGES IN THE BLOOD VOLUME DURING PREGNANCY AND DELIVERY. [Internet]. Vol. 26, Anesthesiology. Anesthesiology; 1965 [cited 2020 Nov 17]. p. 393–9. Available from: https://pubmed.ncbi.nlm.nih.gov/14313451/
32. WOMAN Trial Collaborators. Effect of early tranexamic acid administration on mortality, hysterectomy, and other morbidities in women with post-partum haemorrhage (WOMAN): an international, randomised, double-blind, placebo-controlled trial. Lancet [Internet]. 2017 May 27 [cited 2017 Sep 27];389(10084):2105–16. Available from: http://www.ncbi.nlm.nih.gov/pubmed/28456509