sara mohseni - Midwifery student, Nursing and Midwifery School, Islamic Azad University Isfahan (Khorasgan) Branch, Isfahan, Iran
zahra karimi - Nursing student, Nursing and Midwifery School, Islamic Azad University of Abadeh, Abadeh, Iran
behnam masmooi - Department of nursing School, Shiraz University of Medical Sciences, Abadeh, Iran

Background: Pregnancy is one of the physiological changes in the human body that sometimes due to abnormalities lead to abortion and this process doesn’t to end. One uncommon reason of abortion is anembryonic gestation but it’s rising in Pregnancies, which refers to the state that the zygote is formed but its growth rate will stop. The aim of this study is review the cause of anembryonic gestation.Methods: this study is a review of the scientific bases, through Search in Sciencedirect, Pubmed, as well as books and other authoritative scientific sources since 2005.Result: Genetic abnormalities are the most common reason of anembryonic gestation. Also the hypothesis that blood copper levels in the first trimester lead to anembryonic gestation was rejected. In a study HSP (Heat shock proteins) proteins has been viewed in anembryonic gestation. In some studies the relationship between radio waves and HSP proteins were confirmed but the relationship between anembryonic gestation and radio waves is unknown. In two studies the reason of early abortion decrease levels of angiogenic markers like as tyrosine kinase and Presence of Hofbauer cells in the placenta knows. Also Level variations of the Anti-müllerian hormone can lead to early abortion that for treatment of this condition Dydrogesterone was recommended.Conclusion: According to studies, many causes considered for anembryonic gestation but still properly the reason of this phenomenon is unknown.

Abortion, Anembryonic gestation, Blighted Ovum, Pregnancy