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Another reason not to smoke while pregnant

By Lisa Rapaport

(Reuters Health) – Women who smoke throughout being pregnant could also be extra doubtless to have youngsters with kidney injury than moms who avoid cigarettes, a research suggests.

Smoking throughout being pregnant has lengthy been linked to preterm and underweight infants and a variety of start defects. The present research presents recent proof that the kidneys are among the many organs in danger for injury, stated lead writer Dr. Maki Shinzawa, a public health researcher at Kyoto University in Japan.

“Cigarette smoking releases nicotine and other harmful or potentially harmful substances, such as nitrogen oxide, polycarbonate, and carbon monoxide, some of which cross the placenta,” Shinzawa stated by e mail. “Some of these trans-placental substances may affect fetal programming of the kidney during pregnancy.”

Shinzawa and colleagues examined knowledge from urine exams from 44,595 youngsters to search for elevated ranges of protein within the urine, which may point out impaired kidney perform.

Data on maternal smoking was collected throughout women’s prenatal checkups, and researchers additionally had data from their youngsters’s health checkups at 4, 9, 18 and 36 months of age.

Overall, 79 % of women stated they by no means smoked and one other four % stated they stopped smoking throughout being pregnant. About 17 % of the moms stated they continued to smoke while they have been pregnant.

The absolute danger of kidney injury among the many youngsters was low. But in contrast with youngsters born to nonsmoking moms, youngsters whose moms smoked while pregnant have been 24 % extra possible to present indicators of kidney injury of their urine checks by age three.

Urine checks confirmed elevated protein ranges in 1.7 % of youngsters born to people who smoke, 1.6 % of youngsters whose moms have been former people who smoke and 1.three % of youngsters born to women who by no means smoked.

Children uncovered to second-hand smoke at residence additionally appeared to have a better danger of kidney injury than youngsters who didn’t reside with people who smoke, however the distinction wasn’t large enough to rule out the likelihood that it was due to probability.

One limitation of the research is its reliance on women to precisely report and recall how a lot they smoked earlier than or throughout being pregnant, and a scarcity of lab exams to affirm smoke publicity, the authors observe within the Clinical Journal of the American Society of Nephrology.

Still, the findings add to proof linking smoking to kidney injury, a connection that some earlier analysis has established for grownup people who smoke and for youngsters who inhale second-hand smoke, stated Dr. Paul Fowler, director of the Institute of Medical Sciences on the University of Aberdeen within the UK.

“Maternal smoking has been observed to lead to reduced kidney size in offspring, which is of concern since it is known that retarded kidney development contributes to (high blood pressure) and renal injury in adults,” Fowler, who wasn’t concerned within the research, added by e mail.

“This study highlights one more reason why women should not smoke during pregnancy and why children should be raised in cigarette-free households,” Fowler stated. “It is not, in itself, an overwhelming reason, but rather one more nail in the coffin.”

SOURCE: Clinical Journal of the American Society of Nephrology, on-line December 7, 2016.

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