英语论文网

Likewise, compared with women younger than 35 years of age, the stillbirth rate is increased 2- fold for women 35-39 years of age, and 3- to 4-fold for women aged 40 years old or olderwhereas some age-associated risk is due to higher rates of maternal complications, in uncomplicated pregnancies there may be a 50% increased risk associated only with maternal age 35 years or older (Nohr et al., 2005). Stress is a suspected cause of stillbirth which might occur as a result of a major life event (such as loss or poverty) (Huang et al., 2000) or through unexplained health changes related to adverse childhood experiences (Hillis et al., 2004). Different exposures are attributed to stillbirth. One of the most prevalent and preventable cause of stillbirth is cigarette smoking (Hillis et al., 2004).

Smoking negatively affects fetal growth and oxygen supply to the tissues as it produces high levels of carboxyhemoglobin and decreases blood supply to the placenta. Smoking is also associated with increased risks of placenta previa and placental abruption and women who stop smoking in the first trimester have stillbirth rates equivalent to women who never smoked which indicates that quitting smoking in early pregnancy may significantly reduce the chances of occurrence of stillbirth (Hillis et al., 2004). A variety of complications result due to continuous exposure of different recreational drugs. Consumption of cocaine during pregnancy is also linked with stillbirth because it causes fetal growth restriction and/or abruption.

The use of meth amphetamines leads to premature deliveries and stunted growth but its association with stillbirth remains unknown. In some cases, alcohol consumption during pregnancy has been associated with an increased risk of stillbirth (Mary et al., 2006). According to a study in Scandinavia, for women who consume less than 1 drink per week, the rate of stillbirth is 1.37 per 1000 births while the rate increases to 8.83 per 1000 births in women who consume 5 drinks or more per week.

If smoking habits, caffeine intake, prepregnancy body mass index, marital status, occupational status, education, parity, and fetal gender are considered, the risk of stillbirth for women consuming 5 drinks or more per week was 2.96 (95% confidence interval 1.37 to 6.41) (Mary et al., 2006). Some studies show a protective effect on both stillbirth and fetal growth restriction rates if small amounts of alcohol are consumed during pregnancy (Mary et al., 2006). A link between pesticide exposure and stillbirth was observed by Pastore and his colleagues in 1997.

Occupational exposures prove to be deleterious compared to residential exposure because the occupational exposures cause congenital abnormalities in addition to risk of stillbirth. A noteworthy fact is that the use of fertility drugs is also associated with stillbirths. This finding is problematic due to the fact that many women make use of fertility treatments to conceive. However, data on stillbirths due to exposures is obtained from retrospective studies which are prone to bias. The link between exposures and stillbirth should therefore be dealt with great attention and care.

Mate本论文由英语论文网提供整理，提供论文代写，英语论文代写，代写论文，代写英语论文，代写留学生论文，代写英文论文，留学生论文代写相关核心关键词搜索。