What are the Pathogeneses of Recurrent Spontaneous Abortion (RSA) / Miscarriages?

Dr. Fenglin Chen indicates that the common pathogeneses of recurrent spontaneous abortion (RSA) / miscarriages are as follows, etiological treatment can save the fetus, intervention treatment can be performed before pregnancy to prevent miscarriage!
First, abnormal embryo Chromosome abnormality of embryo.
Second, abnormal maternal.
(I) Immune factors: recurrent spontaneous abortion (RSA) / miscarriages caused by positive anti-embryo antibody or maternal blood type mismatch.
(II) Endocrine factors: e.g., recurrent spontaneous abortion (RSA) / miscarriages caused by  inadequate luteal function, hypothyroidism, etc. 
(III) Morphological of reproductive system: uterine malformation as unicornuate uterus, bicornuate uterus, uterus didelphys, uterine septum, etc. 
(IV) Traumatic stimuli factors: uterine adhesion, uterine trauma surgery, excessive sexual intercourse, external force impact, etc. 
(V) Maternal infectious diseases: such as influenza virus, acute choamydiae infection, hypertension, kidney disease, heart disease, etc.
Third,unhealthy living habits and environmental factors, such as too much exposure of drug use, alcoholism, formaldehyde, lead and other harmful substances can lead to recurrent spontaneous abortion (RSA) / miscarriages. 

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