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Complications during pregnancy confer lifelong risk of ischemic heart disease: BMJ

Dr. Kamal Kant KohliWritten by Dr. Kamal Kant Kohli Published On 2023-02-03T18:15:25+05:30  |  Updated On 4 Feb 2023 1:36 PM IST
Complications during pregnancy confer lifelong risk of ischemic heart disease: BMJ
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According to a new research, Women who experience any of five major pregnancy complications, such as preterm birth and pre-eclampsia, show an increased risk of ischemic heart disease up to 46 years after delivery.

The study from Sweden has been published by The BMJ today.

The researchers say all major adverse pregnancy outcomes should be recognised as lifelong risk factors for ischemic heart disease and women should be offered appropriate care to help prevent its development.

Heart disease is a serious condition where the blood vessels supplying the heart are narrowed or blocked and is the leading cause of death among women worldwide.

Adverse pregnancy outcomes have been linked with higher future risks of heart disease. But although nearly a third of women experience an adverse pregnancy outcome during their reproductive years, few studies have examined more than one outcome in the same group of women, preventing any firm conclusions to be drawn.

To address this, researchers based in the US and Sweden set out to examine the associations between five major adverse pregnancy outcomes and long term risks of ischemic heart disease in mothers.

They identified 2,195,266 women in Sweden with no history of heart disease who gave birth to a single live infant between 1973 and 2015 at an average age of 27.

Using nationwide medical records, they then tracked cases of ischemic heart disease from delivery date to December 2018 (average follow-up time 25 years, up to a maximum of 46 years).

The five major adverse pregnancy outcomes of interest were preterm delivery (less than 37 weeks gestation), small for gestational age at birth, pre-eclampsia, other blood pressure disorders of pregnancy, and gestational diabetes.

Other important factors were taken into account, such as mother’s age, number of children, education level, income, body mass index, smoking, and history of high blood pressure, diabetes, or high cholesterol.

Overall, ischemic heart disease was diagnosed in 83,881 (3.8%) women at an average age of 58 years. The results show that women who experienced any of five major adverse pregnancy outcomes showed an increased risk of subsequent ischemic heart disease.

For example, in the 10 years after delivery, relative rates of ischemic heart disease were increased twofold in women with other hypertensive disorders of pregnancy (46 extra cases per 100,000 person years), 1.7-fold in those with preterm delivery (19 extra cases per 100,000), 1.5-fold in those with pre-eclampsia (12 extra cases per 100,000), 1.3-fold in those with gestational diabetes, and 1.1-fold in those who delivered a small for gestational age infant, after adjusting for all other factors.

Women who experienced several adverse pregnancy outcomes showed further increases in risk. In the 10 years after delivery, rates of ischemic heart disease with 1, 2, or 3 or more adverse pregnancy outcomes were 1.3-fold, 1.8-fold, and 2.3-fold (20, 34, and 58 cases per 100,000 person years), respectively.

Most relative rates decreased over time but remained significantly increased (1.1-fold to 1.5-fold) even 30-46 years after delivery, and were only partially explained by shared genetic or environmental factors within families.

This is an observational study so can’t establish cause and the researchers can’t rule out the possibility that ischemic heart disease was underreported or that unreported maternal smoking, obesity, or other risk factors during pregnancy may have affected their results.

However, the large sample size based on highly complete nationwide birth and medical registry data and long-term follow up prompt the researchers to say that all major adverse pregnancy outcomes should be recognised as lifelong risk factors for ischemic heart disease.

“Women with adverse pregnancy outcomes should be considered for early preventive evaluation and long term risk reduction to help prevent the development of ischemic heart disease,” they conclude.

Reference:

Casey Crump, Jan Sundquist, Mary Ann McLaughlin, Siobhan M Dolan, Usha Govindarajulu, Weiva Sieh, Kristina Sundquist, Adverse pregnancy outcomes and long term risk of ischemic heart disease in mothers: national cohort and co-sibling study doi: 10.1136/bmj-2022-072112

The BMJPregnancyheart diseasepre-eclampsiaischemic heart diseasegestational diabeteshigh cholesterol
Source : The BMJ
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. Email: drkohli@medicaldialogues.in. Contact no. 011-43720751

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