The heart rate and blood pressure during pregnancy are not as significant as previously imagined

New analysis from more than 36,000 healthy women from 20 countries shows that physiological changes during pregnancy may not be as dramatic as traditional teaching.However, the average blood pressure does seem to increase year by year.

Medical textbooks are based on data for more than forty years.A new study published by Oxford University researchers on BMC Medicine contains more recent data.The new research results show that changing women’s blood pressure and heart rate during pregnancy are not the same as before.

Traditionally, medical textbooks taught students to fall by 10-15mmHg in blood pressure in the middle of pregnancy.These textbooks are based on old data and very few pregnant women.This update shows that a larger analysis shows that the diastolic pressure in the middle of pregnancy is low, and the average measurement value is 1-2 mm mercury lower than the earliest measurement value of the 10th week.Analysis also shows that on average, systolic blood pressure will rise slightly during pregnancy.

Since 1967, the blood pressure of pregnant women has increased slightly every year.The continuous rise in blood pressure since 1967 may be the result of increasing age of pregnant women.For those women with the first child and women who already have children, blood pressure is similar.

The analysis also includes heart rate measurement from more than 8,000 women.The increase in heart rate during pregnancy is much less than before.In the early publication, not 20-30 % of the increase (about 15-20 times per minute), but the updated data indicates that the heart rate increases only 7-8 times per minute.This is close to 10 %.

All pregnant women should monitor their blood pressure and heart rate when admission.This helps clinical staff to decide when patients need additional treatment.Most British hospitals check the results of individual patients based on the improvement of the early obstetric warning scores (Meows) to monitor women during pregnancy.This is a version of the national warning score used by NHS, which has been adjusted to explain the physiological changes during pregnancy.However, there are differences between MEOWS between hospitals and based on expert opinions rather than evidence to use blood pressure and heart rate warning thresholds.This new report provides reliable evidence -based blood pressure and heart range throughout the pregnancy, and can identify women with worshiping health in the entire pregnancy period during pregnancy.

Dr. Lucy Mackillop, an obstetrician consultant, and one of the authors said: "This is an important study that questioned the view of the general changes in life signs during pregnancy.The importance of. It is urgent to be specific to the evidence -based warning score of pregnant women. This research should provide information for their development. "

Nihr Oxford Biomedical Research Center Dr. Peter Watkinson, the theme consultant of the Digital Health Research Center of Nihr Oxford Biomedical Research, said, "We understand normal changes during pregnancy. This new analysis allows usPregnancy. "Full text" Blood pressure and heart rate trend during normal pregnancy: system evaluation and furniture analysis "was published on BMC Medicine.””””

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