The findings of Shalak et al of an association between
chorioamnionitis and neonatal brain damage is very interesting, but we
would like to propose that the causative factor in this association has
nothing to do with the actual chorioamnionitis condition or the bacteria
itself.
Rather, the damage is being caused iatrogenically at the time of
birth by the immediate clamping of the umbilical cord. This prevents
normal placental transfusion and renders the neonate significantly
hypovolemic, as well as hypoxic if the lungs do not begin to function
immediately or if any resucitation is necessary.
Although immediate clamping is (unfortunately) a common practice,
babies born in a chorioamnionitis situation have their cords clamped
especially quickly for two reasons.
Firstly, the infant will be taken by neonatologists immediately for
evaluation and possible treatment. The sooner the cord is clamped, the
faster they can evaluate the child, so it will be done with particular
urgency.
Secondly, because it is sometimes preferred to wait until the cord is
clamped to administer antibiotics to the mother, the cord is clamped at
the earliest possible moment so that the treatment of the mother can be
started.
Because of their being deprived of between 20% and 50% of their blood
volume, these babies not only have proportionally fewer Red Blood Cells
(RBCs), but they also have correspondingly fewer White Blood Cells (WBCs)
and other immune factors. Thus, their infection-fighting tools are
deficient, as well as their RBCs and the blood volume needed to carry
these cells to all the end organs, leaving them more susceptible to
adverse effects of any infection caused by the chorioamnionitis.
Of course, because the blood volume (and plasma) is proportionately
less, and very difficult to measure, the deficiencies in RBCs and WBCs in
blood samples do not show up in lab tests. This masks the problem so that
few realize what is going on.
As far as we know, no one has even tried to measure WBCs
independently (with a tracer) of the rest of the blood elements.
If only the neonatologists could evaluate the neonate while the cord
is still intact and if only the antibiotic administration to the mother
could be delayed just a few minutes, the brain injuries found by Shalak et
al could be avoided.
It is easy to dismiss the dangers on immediate cord clamping as a non
-issue, mainly because of common misconceptions. However, please take a
look at some of the material available at www.cordclamping.com and in
particular the paper recently presented about an association between cord
clamping and brain lesions resulting in autism (1).
The brain injury found by Shalak et al should serve as further
evidence that the commonplace practice of immediate cord clamping should
be avoided unless absolutely medically necessary.
Cory Mermer
Judith Mercer, CNM
Eileen Simon, PhD, RN
References:
1. Simon EN, Morley GMM, Brainstem Lesions in Autism: Birth Asphyxia
and Ischemia as Causative Factors, presented at IMFAR autism conference,
November 1, 2002. (see full presentation at
http://www.cordclamping.com/IMFAR/IMFARpaper.htm )