Introduction

Recurrent miscarriage, also known as recurrent pregnancy loss, is defined as the loss of two or more consecutive pregnancies before 20 weeks of gestation. It affects approximately 1–2% of couples of reproductive age and can be a devastating experience. In this article, we explore the causes, diagnosis and treatment options for recurrent miscarriage from a scientific perspective.

Causes of Recurrent Miscarriage

  • Chromosomal Abnormalities: Chromosomal abnormalities in the embryo are a common cause of spontaneous and recurrent miscarriage. These abnormalities may result from errors in cell division or changes in the parents' gametes. According to a study published in The New England Journal of Medicine, approximately 50–60% of early miscarriages are attributable to chromosomal abnormalities.
  • Anatomical Disorders: Abnormalities in the uterus, such as Asherman's syndrome (uterine adhesions) or a septate uterus, can interfere with embryo implantation and development. Magnetic resonance imaging (MRI) and hysteroscopy are effective diagnostic tools for identifying these structural problems.
  • Endocrine Disorders: Hormonal disorders, such as polycystic ovary syndrome (PCOS), luteal insufficiency and thyroid problems, can contribute to recurrent pregnancy loss. A study in Human Reproduction found that women with untreated hypothyroidism have a significantly higher risk of miscarriage.
  • Immune Disorders: Autoimmune disorders, such as antiphospholipid syndrome (APS), can cause recurrent miscarriage by interfering with blood clotting and embryo implantation. Screening for antiphospholipid antibodies is crucial for diagnosing APS and implementing appropriate treatment.
  • Environmental and Lifestyle Factors: Smoking, excessive alcohol consumption, obesity and exposure to environmental toxins can increase the risk of recurrent miscarriage. Changing these factors may improve success rates in future pregnancies.

Diagnosing Recurrent Miscarriage

Diagnosing recurrent miscarriage involves a thorough evaluation that includes:

  • Complete Medical History: Collecting detailed information about the patient's medical, surgical and reproductive history.
  • Genetic Testing: Parental karyotyping and genetic analysis of the products of conception can identify chromosomal abnormalities.
  • Imaging Studies: Transvaginal ultrasound, hysterosalpingography and MRI are essential for assessing uterine anatomy.
  • Hormonal and Immunological Tests: Measuring thyroid hormone and progesterone levels and testing for antiphospholipid antibodies help identify hormonal imbalances and immune disorders.

Treating Recurrent Miscarriage

Treatment for recurrent miscarriage varies according to the underlying cause:

  • Genetic Interventions: Genetic counseling and in vitro fertilization (IVF) with preimplantation genetic diagnosis (PGD) may be recommended for couples with chromosomal abnormalities.
  • Uterine Surgery: Surgical correction of uterine abnormalities, such as septa or adhesions, may improve implantation rates and reduce the risk of miscarriage.
  • Hormonal Therapy: Progesterone supplementation during the luteal phase or treatment of thyroid dysfunction are crucial to maintaining a healthy pregnancy.
  • Immunological Treatment: Anticoagulants, such as heparin, and aspirin in women with APS can prevent excessive clotting and improve pregnancy outcomes.
  • Lifestyle Changes: Adopting healthy habits, such as stopping smoking, reducing alcohol consumption and reaching a healthy weight, can have a positive impact on fertility and pregnancy success.

Conclusion

Managing recurrent miscarriage requires a personalized, multidisciplinary approach. Accurately identifying the underlying causes and implementing appropriate treatments can significantly increase the chances of carrying a pregnancy to term. For affected couples, support from specialist health professionals and access to appropriate resources are essential to overcoming this difficult experience.

References

  • «Chromosomal Abnormalities and Recurrent Miscarriage,» The New England Journal of Medicine, 2019.
  • «Thyroid Function and Recurrent Miscarriage: A Prospective Study,» Human Reproduction, 2020.
  • «Anatomical Factors in Recurrent Pregnancy Loss: Uterine Anomalies,» Fertility and Sterility, 2021.

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