In this study, the demographic characteristics of
the pregnant women and pregnancy outcomes who
exposed to CVMs during their pregnancies were
examined. Although most of the pregnancies resulted
healthy live births, two (4.3%) pregnancies ended
in miscarriage and three (6.4%) pregnancies were
terminated electively. The rates of miscarriage and
elective termination in this study are similar to the
general population.[
7,
8]
Cardiac diseases are complicated by approximately
1% of all pregnancies.[9] Pregnant women with or
without underlying cardiovascular disease may need
to use CVMs due to the physiological changes during
pregnancy. This need may be caused by worsening of
an existing disease or by a newly developing condition.
In general, medications used to treat cardiovascular
conditions are antihypertensives, diuretics,
antiarrhythmics, anticoagulants and antilipidemics.
Moreover, CVMs are preferred in other indications
such as migraine, tremor, hyperthyroidism, and
anxiety disorders.[9] However, the effects of CVMs on
the developing fetus have not been fully understood,
yet. Pregnant women need a careful assessment and
counselling for CVMs use and their maternal/fetal
effects, as well as expert cardiac care in pregnancy.
Teratogenicity Information Services are specialized
units providing information on the use of medication/
substance during pregnancy and lactation period.
The TIS of Dokuz Eylul University is a regional unit
dedicated to provide information about medication/
substance use during pregnancy and/or lactation period
since 2011.
Epidemiological data on CVMs exposures during
pregnancy are limited. In a study carried out in
Germany on drug prescriptions in pregnancy, CVMs
accounted for 17% of the medicines prescribed during
pregnancy.[10] In another study conducted by Demir et
al.,[11] CVMs were responsible for 9.5% of all exposures
among the pregnant women admitted to TIS. Göker
et al.[12] also reported that the use of CVM ratios
were 1.14% and 8.17% in a study evaluating pregnants
admitted to two reference hospital in our country. In
this study, this rate was 12.6% of the patients applied
to the TIS of our institution.
The increasing prevalence of women with adverse
pregnancy outcomes (stillbirth, fetal malformations
or abortus) due to the increasing maternal age of first pregnancy remains as a challenging issue. Advanced
maternal age, particularly over 35 years of age, poses
a greater risk of pregnancy complications.[13] Almost
7% of stillbirths are attributed to advanced maternal
age (>35 years) worldwide. Also, adolescent pregnancy
(<16 years) is associated with an increased risk of adverse
pregnancy outcomes.[1,14] In this study, the mean age of
pregnant women was 34.0±5.5 years. Additionally, it is
noteworthy that four (80%) of five pregnancies ended
in miscarriage or elective termination were older than
35 years old (31 to 40 years).
The pregnancy termination rates in
consanguineous marriages may be higher due to the
increased risk for recessively inherited congenital
diseases.[14] In a study carried out in our country, the
rate of consanguineous marriage was found to be
12.7%.[11] In this study, the rate of consanguineous
marriage was found as 6.4% and all pregnancies
with consanguineous marriages resulted in a healthy
infant.
On the other hand, the presence of chronic
diseases during pregnancy also poses a risk for
adverse pregnancy outcomes. The most common
chronic diseases in pregnant women are epilepsy,
hypertension, diabetes mellitus, psychiatric
diseases, and thyroid dysfunctions.[15] In this study,
approximately 90% of the mothers had a chronic
disease, consistent with the previous reports, and
hypertension, diabetes mellitus, and hypothyroidism
were the most common diseases. Furthermore,
60% of the mothers whose pregnancies ended
in miscarriage or terminated electively had an
underlying maternal chronic disease such as
hypothyroidism, hypertension, or diabetes mellitus.
Beta-blockers are the most commonly used
drugs in the treatment of hypertension in pregnancy
and are also frequently used in the management
of conditions, such as thyrotoxicosis, hypertrophic
cardiomyopathy, and mitral stenosis.[16-19] In this
study, in line with the previous reports, the most
commonly used CVMs during pregnancy were betablockers,
diuretics, angiotensin-converting enzyme
inhibitors, calcium channel blockers, and angiotensin
receptor blockers, respectively. In addition, 80% of the
mothers whose pregnancies ended in miscarriage or
elective termination used beta-blockers. Beta-blockers
can cross the placenta and may cause potential
physiological changes in the fetus.[20] Although there
are inconsistent data about the relationship between the use of beta-blockers in pregnancy and the risk
of fetal growth restriction, preterm birth, cardiac
malformations, and perinatal mortality, there are
some reports indicating that direct relationship could
not be established due to methodological limitations
in the interpretation of available data and presence
of confounding factors. However, it is also reported
that uncontrolled hypertension during pregnancy may
increase the risk of maternal and fetal adverse events
such as preeclampsia, premature birth, gestational
diabetes, fetal growth restriction, and intrauterine
demise.[21-25]
In the current study, amiodarone with concomitant
medications was used in a pregnancy ended in
miscarriage. Amiodarone and desethylamiodarone,
its major metabolite, can cross the placenta and
reach 9 to 14% of maternal serum concentrations
in fetus.[25] The available data are limited to
identify the fetal risk related to amiodarone use in
pregnancy. Amiodarone use during pregnancy may
also increase the risk of neonatal hypothyroidism
with or without goiter and predisposes to neonatal
hyperthyroxinemia. It may be also associated with
fetal bradycardia, long QT syndrome, ventricular
septal defect, prematurity, and death. Amiodarone
can be used during pregnancy, if the potential benefit
to the mother justifies the possible risk to the fetus.
Neonatal electrocardiogram and thyroid functions
monitoring are also recommended.[25]
To the best of our knowledge, previous reports
are usually limited to the use of CVMs alone
during pregnancy, and are lacking the information
regarding pregnancy outcomes related to their use
with concomitant medications. Furthermore, other
confounding factors that may affect pregnancy
outcomes such as maternal age, smoking or alcohol
use, radiation exposure, and chronic disease should
be considered. Our relatively low sample size is the
main limitation of this study. Although the number
of the cases in this study is limited, our results may
contribute to the literature. To achieve more accurate
results, further large-scale, prospective studies are
needed investigating specific CVMs groups.
In conclusion, based on our study results, it is not
possible to establish a definite causality relationship
between pregnancy outcomes and CVMs exposure.
Nevertheless, we believe that the results of this study
can contribute to the existing body of knowledge in
this field and provide additional information to the physicians regarding the teratogenic risks of CVMs
exposures during pregnancy.
Declaration of conflicting interests
The authors declared no conflicts of interest with respect
to the authorship and/or publication of this article.
Funding
The authors received no financial support for the research
and/or authorship of this article.