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By Jocelyn Wiener
(Reuters Health) – Potential fathers may increase their partner's risk of miscarriage by smoking during pregnancy, or even in the pre-conception period, suggests a large study of China [19659003]. Based on data on nearly 6 million pregnancies, researchers found that women whose partners smoked during the first months of pregnancy were 17% more likely to have a miscarriage than women with non-pregnant partners. smoking. The design had a 18 percent lower risk of miscarriage than those whose smoking partner did not give up, reports the study team in the Journal of Epidemiology & Community Health (19659004). ] "Although we have long known that the mother smokes there is an increased risk for adverse pregnancy outcomes, dads who smoke also influence the" success "of the pregnancy," Dr. Alison Holloway, who does not have a pregnancy. was not involved in the study, said in an email Holloway, professor of obstetrics and gynecology at McMaster University in Hamilton, Ontario
The authors collected data from of 5.8 million non-smoking women aged 18 to 49 and their husbands in rural China Couples were participating in a free national pre-pregnancy health check project from 2010 to 2016. This service included three stages : a health check before conception, a uivi early pregnancy within three months of conception and follow-up of pregnancy. about one year after the examination of early pregnancy
About 29% of male partners were smokers, and the overall rate of miscarriage was about 2.5%.
When the male partner was a non-smoker, miscarriage The miscarriage rate was 2.79%, compared to 3.35% when the father did not smoke. "The importance of tobacco control, especially with regard to paternal smoking, should be emphasized, and husbands should quit smoking when planning a pregnancy," write the study's authors. , many of whom work or the Chinese National Research Institute for Family Planning in Beijing, and who did not respond to requests for comment.
Although the authors have identified an badociation between smoking and miscarriage, the study does not prove that one causes the other. He also did not examine the mechanisms by which paternal smoking could influence pregnancy loss.
There are at least two possible ways for a husband to smoke to influence miscarriage, Holloway said. A smoking husband may expose his wife to chemicals through second-hand smoke and second-hand smoke – that is, smoke deposits on clothes, furniture, carpets, etc.
"Although they have addressed the impact of paternal smoking, you still can not determine how daddy's smoking behavior affects the risk of miscarriage," she told Reuters Health
. The main limitations of the study, Dr. Zev Williams, head of the Division of Reproductive Endocrinology and Infertility at Columbia University Medical Center in New York, said in an email. He also noted that the study was limited by its reliance on patient memory and did not measure the actual levels of many toxins produced by smoking.
Williams, who was not involved in the study, described the pregnancy as "valuable but"
It is "very important to try to optimize all the factors that can contribute to a healthy pregnancy, "he noted. "Although the focus has been on the health of the mother, this study highlights the importance of her environment and the partner's contribution to the health of the pregnancy."
SOURCE: https://bit.ly/2MtnwC7 Journal of Epidemiology & Community Health, online June 11, 2018.
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