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This study aimed to investigate the influencing factors of missed abortion during the two-child peak period in China. 220 pregnant women were divided into observation (presence of missed abortion, 100 cases) and control group (no presence of missed abortion, 120 cases). The single factor analysis of clinical data showed that, advanced age, premarital examination, genitalia abnormality, luteal insufficiency, spouse semen abnormality, mycoplasma infection, chlamydia infection, sexually transmitted diseases, perm or dyeing hair in pregnancy, radiation overload, primipara, spontaneous abortion history, smoking, drinking and overly intimate with pets had significant difference between observation and control group ( p  < .05). The logistic regression analysis results showed that, the advanced age, genital abnormality, luteal insufficiency, spouse sperm abnormality, pregnancy infection, primipara, spontaneous abortion history and bad life habits were the main risk factors of missed abortion. In the intervention for prevention of missed abortion, these factors should be paid more attention.Impact statement What is already known on this subject? There are many complex factors affecting the embryonic development and causing the missed abortion. What do the results of this study add? The advanced age, genital abnormality, luteal insufficiency, spouse sperm abnormality, pregnancy infection, primipara, spontaneous abortion history and bad life habits are the main risk factors of missed abortion. What are the implications of these findings for clinical practice and/or further research? These findings can provide a theoretical basis for the further prevention of missed abortion.

To investigate stress levels, serum cortisol levels, and changes in IL-12 concentration in patients with missed abortion. Patients with missed abortion (n = 48) were age and gestational age-matched with normal early pregnancy cases (n = 48). All subjects completed a stress evaluation survey questionnaire about common stressors. Venous blood samples were collected at 07.00 hours, and serum cortisol and IL-12 concentrations were measured by electrochemiluminescence immunoassay and ELISA methods, respectively. Missed abortion patients demonstrated a significantly higher number of common stressors and higher serum cortisol levels compared to controls (both p < 0.05). Dilation and curettage did not lead to significant differences in serum cortisol and IL-12 levels (p > 0.05). Stress and immunity alterations of the immune system may contribute to the aetiology of missed abortion.

A prospective study was conducted on the incidence of intrauterine pathology after missed abortion diagnosed and treated by hysteroscopy. A hysteroscopy was performed in 100 women four to 12 weeks after a dilatation and curettage for missed abortions. Uterine malformations were found in 12 patients, intrauterine adhesions in seven and submucous myoma in two cases. As a side finding four cases of asymptomatic retained products of conception were found. Most cases of the intrauterine pathology were treated instantly by hysteroscopy, "see and treat" regimen was preferred. Post-missed abortion-hysteroscopy is a simple and useful method for early diagnosis and treatment of congenital and acquired intrauterine pathology.