Although a twin pregnancy is a risk factor for hypertensive disorders of pregnancy, studies investigating longitudinal blood pressure changes during twin pregnancies are uncommon. The aims of this study were to evaluate the longitudinal blood pressure changes during twin pregnancies and to compare blood pressure levels between twin and singleton pregnancies.
Five hundred dichorionic diamniotic twin, 240 monochorionic diamniotic twin, and 80 775 singleton pregnancies were included in this Japanese prospective birth cohort study. A marginal model was applied to evaluate the SBP, DBP, and mean arterial pressure levels during early gestation, mid-gestation, and late gestation.
The blood pressure levels fell from early-to-mid-gestation and rose after mid-gestation in the dichorionic and monochorionic diamniotic twin pregnancies. The SBP and mean arterial pressure levels during early gestation and the DBP and mean arterial pressure levels during late gestation were higher in the dichorionic diamniotic twin pregnancies than those in the singleton pregnancies. The blood pressure levels in the monochorionic diamniotic twin pregnancies were higher than those in the singleton pregnancies at each gestational stage, except for the SBP during late gestation.
Although the longitudinal blood pressure changes during twin pregnancies were similar to those during singleton pregnancies, the blood pressure levels during twin pregnancies were higher. Further studies that examine the associations between the longitudinal blood pressure changes during pregnancy and the perinatal outcomes in twin pregnancies are necessary.
aDepartment of Obstetrics and Gynecology, Osaki Citizen Hospital, Osaki
bDepartment of Obstetrics and Gynecology, Tohoku University Graduate School of Medicine
cDivision of Public Health, Hygiene and Epidemiology, Tohoku Medical Pharmaceutical University
dTohoku Medical Megabank Organization, Tohoku University
eEnvironment and Genome Research Center, Tohoku University Graduate School of Medicine
fClinical Research, Innovation and Education Center
gDepartment of Pharmaceutical Sciences, Tohoku University Hospital, Sendai, Miyagi
hDepartment of Obstetrics and Gynecology, Ehime University School of Medicine, Toon, Ehime
iInternational Research Institute of Disaster Science, Tohoku University, Sendai, Miyagi, Japan
Correspondence to Noriyuki Iwama, MD, PhD, Department of Obstetrics and Gynecology, Osaki Citizen Hospital, 3-8-1, Honami, Furukawa, Osaki, Miyagi 989-6183, Japan. Tel: +81 229 23 3311; fax: +81 229 23 5380; e-mail: firstname.lastname@example.org
Abbreviations: APS, antiphospholipid syndrome; BP, blood pressure; HDP, hypertensive disorders of pregnancy; JECS, Japan Environment and Children's Study; K6, Kessler 6-item psychological distress scale; MAP, mean arterial pressure; PlGF, placental growth factor; sFlt-1, soluble fms-like tyrosine kinase-1; SLE, systemic lupus erythematosus
Received 6 April, 2018
Revised 17 May, 2018
Accepted 6 June, 2018
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