Seasonal trends of blood pressure during pregnancy in Japan: the babies and their parents' longitudinal observation in Suzuki Memorial Hospital in Intrauterine Period study.

Abstract:

OBJECTIVE:Blood pressure (BP) increases both in winter and in the last trimester of pregnancy. Some interaction seems to exist between season and gestational age. The present study observed home BP values during pregnancy with adjustment for seasonal variation and gestational age. METHODS:We observed 10353 home BP measurements from 101 normal pregnant women attending a maternity hospital in Japan. Home BP values were examined by mixed linear model adjusting for meteorological data and gestational age. RESULTS:The lowest home BP values were observed in the second trimester [mean (+/-standard deviation) systolic/diastolic BP, 101.8 +/- 7.9/59.8 +/- 5.8 mmHg at gestational week 20]. In the last trimester, home BP values gradually increased and the values after gestational week 26 were significantly higher than those at gestational week 20 (110.1 +/- 9.7/66.8 +/- 7.7 mmHg at gestational week 40). A 10 degrees C increase in daily minimum outdoor temperature was associated with a mean reduction of 2.5/2.5 mmHg (Delta systolic BP/Delta diastolic BP: 95% confidence interval, 2.3/2.4 to 2.6/2.7 mmHg) in home BP with adjustment for gestational age. The largest and smallest estimated home BP changes during pregnancy were 12.8/12.5 and 3.1/3.0 mmHg in pregnant woman who delivered in January and July, respectively. CONCLUSION:Interactions among BP, season and gestational age should be considered when evaluating BP in pregnant women. Risks associated with high BP might be underestimated in pregnant woman in summer who will deliver in winter.

journal_name

J Hypertens

journal_title

Journal of hypertension

authors

Metoki H,Ohkubo T,Watanabe Y,Nishimura M,Sato Y,Kawaguchi M,Hara A,Hirose T,Obara T,Asayama K,Kikuya M,Yagihashi K,Matsubara Y,Okamura K,Mori S,Suzuki M,Imai Y,BOSHI Study Group.

doi

10.1097/HJH.0b013e32831364a7

subject

Has Abstract

pub_date

2008-12-01 00:00:00

pages

2406-13

issue

12

eissn

0263-6352

issn

1473-5598

pii

00004872-200812000-00022

journal_volume

26

pub_type

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