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Is Iron Deficiency In Pregnancy A Problem?
Maternal iron deficiency anemia:A public health problem
Iron supplementation is a very widely practised public health measure in India but little is known about its benefits to the mother and offspring. The effect of anaemia and iron deficiency on pregnancy outcome needs to be reviewed with an attempt to identify current gaps in the information we have.
Around 35%-75% (56 % average) women in the developing world and 18 % in industrialised countries might be anaemic at conception.Screening for prevalence of iron deficiency as shown by a low serum ferritin and absent or sparse stainable iron in the bone marrow is not always practically feasible. The prevalance of iron deficiency is much greater than that of iron deficiency anaemia.It may develop even in woman who enter pregnancy with adequate iron stores because of the high demand in pregnancy.
Most anaemic pregnant women are asymptomatic
Anaemia is first recognized during routine check up.
Causes of maternal mortality
Iron deficiency anaemia is a risk factor for pre- term delivery with the child being born with a low birth weight and subsequently having poor health as a neonate.Although there is not sufficient evidence to derive any conclusion to the extent it contributes to maternal mortality.
A study done in Indonesian women showed that one third of the women had folic acid deficiency and two third had hook worm infestation. In tropical countries causes other than just iron deficiency may be prevalent.
Causes of maternal anaemia
Maternal affects of anaemia
Pre term labour
Aggravation of pre-eclampsia and APH
Cardiac de-compensation with pulmonary oedema
Increased incidence of uterine inertia
Poor ability to withstand excessive blood loss
Sub involution of uterus
Delayed wound healing`if Caesarian delivery
Severity :ICMR Data
There is a increase in maternal iron absorption during pregnancy but ferritin(stored iron in body) falls during 12 -25 weeks of pregnancy because it is utilised for the expansion of red cell mass. Transfer of iron from mother to foetus occurs at around 30 weeks of gestation and this corresponds to the peak of maternal iron absorption.This transfer from mother to foetus is done by a carrier called transferrin. If maternal iron is poor there is a increase in tranferrin receptors to take up more iron by the placenta.
Concern that anaemia in pregnant women has a greater risk of mortality and morbidity to the mother
Retrospective observational studies have associated maternal haemoglobin concentration at or close to delivery with a high risk of maternal mortality if the anaemia was severe.Whether this low haemoglobin is just a reflection of greater amount of blood loss by the mother during delivery or late arrival at admission is debatable as both these factors can also affect mortality independently.
Maternal anaemia- <7 gm/dl increases the risk of death*
Rapid cardiac decompression even without the additional stress of true post-partum haemorrhage.
< 500ml blood loss during delivery could be fatal with severe anaemia— 2001 American Society for Nutritional Sciences. J. Nutr. 131: 604S–615S, 2001.
No objective cut off value
There is no established haemoglobin concentration below which the risk of mortality increases and the haemoglobin cut off suggested needs to be substantiated.
Even if a woman is not anaemic iron supplementation improves iron stores during pregnancy and after delivery.This is important in a subsequent pregnancy if the birth spacing is less.If the mother is iron deficient the foetus also has low iron store.If the iron store is low in the first year it has adverse affects on the growth and development.
Maternal anaemia and infant health
Patients with anaemia have babies with low APGAR scores.These scores are significantly higher in those infants whose mothers received iron.
Children of anaemic mothers may have
- More perinatal complications
- More growth stunted
- More likely to have low stores of iron and other nutrients.
Klebenoff et al. showed doubled risk of preterm delivery with anaemia during the second trimester but not during the third trimester— Klebanoff MA et al.Am J Obstet Gynecol 1991;164:59–63.
Low APGAR scores
Higher maternal Hb -better APGAR scores and lower risk of birth asphyxia.
APGAR scores significantly higher in mothers who received iron supplementation.
Rusia U, Madan N, Agarwal N, Sikka M, Sood S. Effect of maternal
iron deficiency anaemia on foetal outcome. Indian J Pathol
Preziosi P, Prual A, Galan P, Daouda H, Boureima H, Hercberg S.
Effect of iron supplementation on the iron status of pregnant women:
consequences for newborns. Am J Clin
More perinatal complications.
Deficient iron stores and subsequent anaemia
Lowered childhood intellectual ability
Greenwood R, Golding J, McCaw-Binns A, Keeling J, Ashley D.
The epidemiology of perinatal death in Jamaica. Paediatr Perinat
Anemia + Iron deficiency in the first and second trimester 1.87 fold higher risk of preterm birth but anemia alone was not a risk factor
Dreyfuss M. Anemia and iron deficiency during pregnancy: etiologies
and effects on birth outcomes in Nepal. PhD dissertation. Johns
Hopkins University, Baltimore, 1998
Intervention trials-The difficulties:
Prospective controlled intervention trials to examine the efficacy of iron supplementation for reducing maternal mortality are difficult
- They require a large sample size
- It will be unethical not to treat a known anaemic woman who can be used as a control subject.
It should also be noted that the risk of maternal mortality can be greatly affected by the quality of health care a woman receives.
Maternal anemia & birth outcome
Anaemia in mother and birth weight of the child
There is a U shaped association curve between the mothers haemoglobin and birth outcome.This means that an abnormally high haemoglobin concentration is also a risk for low birth weight in the baby.High haemoglobin might represent poor blood volume expansion which is an important physiological change in pregnancy.
Anaemia In Pregnancy
Intergenerational cycle of Anaemia
Attempt to understand the mechanisms involved in increasing the risk of mortality and iron deficiency anaemia
Maternal death at or close to delivery may be related to --
- A poor ability to tolerate the bad affects of excessive blood loss.
- Increased risk of infection.
- Maternal fatigue
These factors have not been evaluated very systematically but iron deficiency is associated with low lymphocyte activity and supplementation improved lymphocytic function.
Increased risk of infection
Iron deficiency associated with low lymphocyte stimuli indexes and supplementation improved lymphocyte stimulation— A case control study. Das et al 2016,EKizC etal2005
WHO recommendation: 60 mg elemental iron with 400 ug of Folic acid daily for 6 months where the prevalence is < 40% and this dose to be supplemented for another 3 months postpartum in areas where prevalence >40%
As per National Nutritional Anaemia Control Programme, 100 mg of elemental iron and 500 ug of Folic acid for prophylactic supplementation for at least 100 days starting in 2nd trimester and double this dose for treatment of anaemia and to continue it for 3-6 months postpartum for replacement of iron stores
A lot still needs to be learnt regarding anaemia in pregnancy.Till we are able to fill the gaps in our knowledge women should get the benefit of iron supplementation in pregnant women.