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Maternal cannabis use in pregnancy linked to a greater risk of autism: Study

Dr. Kamal Kant KohliWritten by Dr. Kamal Kant Kohli Published On 2020-08-17T18:00:19+05:30  |  Updated On 17 Aug 2020 12:30 PM GMT
Maternal cannabis use in pregnancy linked to a greater risk of autism: Study
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Ottawa researchers have found in one of the largest study of its kind, researchers found that Maternal cannabis use in pregnancy was linked to increased risk of autism in children.The findings were published in the prestigious medical journal Nature Medicine. The incidence of autism was 4 per 1000 person-years among children exposed to cannabis in pregnancy, compared to 2.42...

Ottawa researchers have found in one of the largest study of its kind,  researchers found that Maternal cannabis use in pregnancy was linked to increased  risk of autism in children.The findings were published in the prestigious medical journal Nature Medicine.

The incidence of autism was 4 per 1000 person-years among children exposed to cannabis in pregnancy, compared to 2.42 among unexposed children. 

Recreational cannabis is now legal in Canada, but that doesn't mean it's safe for people who are pregnant or breastfeeding. Health Canada and the Society of Obstetricians and Gynaecologists of Canada recommend against these populations using cannabis, and health warnings to this effect appear on cannabis packaging.

"Despite these warnings, there is evidence that more people are using cannabis during pregnancy," said Dr. Mark Walker, Chief of the Department of Obstetrics, Gynecology and Newborn Care at The Ottawa Hospital, professor at the University of Ottawa and senior author on the study. "This is concerning, because we know so little about how cannabis affects pregnant women and their babies. Parents-to-be should inform themselves of the possible risks, and we hope studies like ours can help."

The research team reviewed data from every birth in Ontario between 2007 and 2012, before recreational cannabis was legalized. Of the half a million women in the study, about 3,000 (0.6 percent) reported using cannabis during pregnancy.

The researchers had previously found that cannabis use in pregnancy was linked to an increased risk of preterm birth, and created an animated video to summarize their findings. In that study, they found that women who used cannabis during pregnancy often used other substances including tobacco, alcohol and opioids.

Considering those findings, in the current study the researchers specifically looked at 2,200 women who reported using only cannabis during pregnancy, and no other substances. They found that babies born to this group still had an increased risk of autism compared to those who did not use cannabis.

The researchers do not know how much cannabis the women were using, how often, at what time during their pregnancy, or how it was consumed. They also note that while they tried to control for other factors that could influence neurological development, their study can still only show association - not cause and effect.

As cannabis becomes more socially acceptable, health-care researchers are mindful that some parents-to-be might think it can be used to treat morning sickness.

"In the past, we haven't had good data on the effect of cannabis on pregnancies," said Dr. Daniel Corsi, Epidemiologist at The Ottawa Hospital and BORN Ontario, which is affiliated with the CHEO Research Institute. "This is one of the largest studies on this topic to date. We hope our findings will help women and their health-care providers make informed decisions."

Women who are thinking about or currently using cannabis during pregnancy should talk to their health-care provider to help make an informed choice about what is best for them and their baby.

for further references log on to: 

http://dx.doi.org/10.1038/s41591-020-1002-5

Nature MedicineObstetricians and GynaecologistspregnancyCannabis useAutism
Source : journal Nature Medicine
Dr. Kamal Kant Kohli
Dr. Kamal Kant Kohli

    Dr Kamal Kant Kohli-MBBS, DTCD- a chest specialist with more than 30 years of practice and a flair for writing clinical articles, Dr Kamal Kant Kohli joined Medical Dialogues as a Chief Editor of Medical News. Besides writing articles, as an editor, he proofreads and verifies all the medical content published on Medical Dialogues including those coming from journals, studies,medical conferences,guidelines etc. Before Joining Medical Dialogues, he has served at important positions in the medical industry in India including as the Hony. Secretary of the Delhi Medical Association as well as the chairman of Anti-Quackery Committee in Delhi and worked with other Medical Councils in India. Email: editorial@medicaldialogues.in. Contact no. 011-43720751

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