Adaptive responses of cardiac function to fetal postural change as gestational age increases.
10.5468/ogs.2016.59.6.427
- Author:
Woo Jin KIM
1
;
Hye Jin CHOI
;
Sun Young YANG
;
Boo Hae KOO
;
Ki Hoon AHN
;
Geum Joon CHO
;
Soon Cheol HONG
;
Min Jeong OH
;
Hai Joong KIM
Author Information
1. Department of Obstetrics and Gynecology, Korea University College of Medicine, Seoul, Korea. md_cho@hanmail.net
- Publication Type:Original Article
- Keywords:
Fetus;
Gestational age;
Postural change;
Tei index
- MeSH:
Cardiovascular System;
Echocardiography;
Female;
Fetus;
Gestational Age*;
Gravitation;
Homeostasis;
Humans;
Posture;
Pregnancy;
Supine Position
- From:Obstetrics & Gynecology Science
2016;59(6):427-433
- CountryRepublic of Korea
- Language:English
-
Abstract:
OBJECTIVE: The cardiovascular system maintains homeostasis through a series of adaptive responses to physiological requirements. However, little is known about the adaptation of fetal cardiac function to gravity, according to gestational age. In the present study, we aimed to evaluate the adaptive responses of cardiac function to postural changes, using Tei index measurements. METHODS: Fetal echocardiography and Doppler examination were performed on 114 women with vertex singleton pregnancies at 19 to 40 weeks' gestation. Participants were placed in an upright seated position, and the Tei index for fetal left ventricular cardiac function was measured. The women were then moved into a supine position and the Tei index was re-measured. RESULTS: The mean Tei index when measured in an upright seated position was significantly lower than that measured in a supine positioning for all fetuses (0.528±0.103 vs. 0.555±0.106, P=0.014, respectively). This difference was also noted in fetuses with a gestational age of 28–40 weeks (0.539±0.107 vs. 0.574±0.102, P=0.011, respectively). However, there was no difference in the Tei index between an upright seated and a supine position among fetuses with a gestational age of <28 weeks (0.505±0.091 vs. 0.516±0.103, P=0.571, respectively). CONCLUSION: Postural changes from an upright seated to a supine position result in an increased Tei index after a gestational age of 28 weeks. This appears to reflect maturation in the adaptive responses of the fetal cardiovascular system to postural changes.
