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Recurrent miscarriages (Thrombophilias in pregnancy (Indications for…
Recurrent miscarriages
Causes
- Genetic abnormalities (mainly chromosomal abnormalities)
- Fetal malformations
- Immunologic disturbancies
- Coagulation problems
- Chronic diseases
- Infections
Prognostic factors
- age >30 years
- diagnosis of antiphospholipid syndrome
- no live-born child
- chronic diseases
- 3 or more consecutive pregnancy losses before 14 weeks with the same partner.
- Fetus – allogenic transplant, completely different antigens foreign for mother’s body.
Rejection of the fetus as transplant results in miscarriage.
immune factors
- 65-75% early pregnancy losses du to immune factors
- autoimmune (5-20%)
- alloimmune (80%).
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Alloimmune
abortion causes
- Lack of maternal answer for fetal antigens or improper answer for foreign antigens of gesational sac:
Change of prevailing immune answer from type Th2 to Th1;
Disturbance of progesteron function in immmunoregulation in the region of contact of maternal and fetal tissue
Lack or deficiency of blocking antibodies
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Heparin use in pregnancy
- Treatment start before 6 weeks of gestation
- Continuation to the end of gestation
- Withdrawal 6 – 24 hours before delivery
- Introducing treatment 8 hours after delivery
- Treatment continuation 6 weeks after delivery
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Progesteron
- Limfocytes CD8 progesteron-positive stimulate production of transfering protein D (blocking) in cellular nucleus and its secretion to the circulation.
- PIBF (progesterone-induced blocking factor) has strong immunoregulating activity and is the most important in pregnancy preservation. The most importan activity of this protein is it’s influence on the cytokines Th1 and Th2 balance.
Blocking antibodies
- In normal pregnancy blocking antibodies are produced (BAbs, blocking antibodies), and they protect the feto-placental transplant from destroying effect of maternal immune system.
- If no reason was found,
LWMH or UFH increase chances of favourable pregnancy outcome
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