Effect of placenta previa on neonatal respiratory disorders and amniotic lamellar body counts at 36-38weeks of gestation.
BACKGROUND
Pregnancies with placenta previa are significantly associated with preterm delivery and cesarean section. Therefore particular attention should be paid to the incidence of neonatal respiratory disorders in pregnancies with placenta previa.


OBJECTIVE
The purpose of this study is to examine the relationship between placenta previa and neonatal respiratory disorders, including respiratory distress syndrome (RDS) and transient tachypnea of the newborn (TTN), and to evaluate the impact of placenta previa on the amniotic lamellar body count (LBC) values.


METHODS
We analyzed the data from 186 registered elective cesarean cases without fetal or maternal complications at 36-38weeks of gestation. Amniotic fluid samples were analyzed immediately without centrifugation, and the LBC was measured using a platelet channel on the Sysmex XE-2100.


RESULTS
RDS was present in four neonates (2.2%) and TTN in 12 neonates (6.5%). The rate of TTN was significantly higher and the LBC values were significantly lower in the placenta previa group than in the control group (P=0.002 and P=0.024). The adjusted odds ratio for neonatal TTN was 7.20 (95% confidence interval: 6.58-7.88) among females with placenta previa. In placenta previa, warning bleeding was a significant factor protecting against neonatal respiratory disorders (P=0.046).


CONCLUSIONS
Placenta previa in itself is a risk factor for neonatal TTN. When an elective cesarean section is performed in cases with uncomplicated placenta previa, special care should be taken to monitor for neonatal TTN even at 36-38weeks of gestation.
Department of Obstetrics and Gynecology, Nagoya University School of Medicine, Nagoya, Japan. Electronic address: hiro-t@med.nagoya-u.ac.jp.
Hiroyuki
H
Tsuda
Department of Obstetrics and Gynecology, Nagoya University School of Medicine, Nagoya, Japan.
Tomomi
T
Kotani
Department of Obstetrics and Gynecology, Nagoya University School of Medicine, Nagoya, Japan.
Seiji
S
Sumigama
Department of Obstetrics and Gynecology, Nagoya University School of Medicine, Nagoya, Japan.
Yukio
Y
Mano
Department of Obstetrics and Gynecology, Nagoya University School of Medicine, Nagoya, Japan; Bell Research Center for Reproductive Health and Center, Nagoya, Japan.
Li
L
Hua
Department of Obstetrics and Gynecology, Kasugai Municipal Hospital, Kasugai-shi, Aichi, Japan.
Hiromi
H
Hayakawa
Department of Pediatrics, Nagoya University School of Medicine, Nagoya, Japan.
Masahiro
M
Hayakawa
Department of Pediatrics, Nagoya University School of Medicine, Nagoya, Japan.
Yoshiaki
Y
Sato
Department of Obstetrics and Gynecology, Nagoya University School of Medicine, Nagoya, Japan.
Fumitaka
F
Kikkawa
D000328:Adult; D000653:Amniotic Fluid / Q000166:cytology*; D016022:Case-Control Studies; D005260:Female; D006801:Humans; D007231:Infant, Newborn; D007234:Infant, Premature; D008297:Male; D016017:Odds Ratio; D010923:Placenta Previa / Q000453:epidemiology / Q000473:pathology*; D011247:Pregnancy; D012127:Respiratory Distress Syndrome, Newborn / Q000453:epidemiology / Q000209:etiology*; D012307:Risk Factors; D059245:Transient Tachypnea of the Newborn / Q000453:epidemiology / Q000209:etiology*
Amniotic fluid; Lamellar body; Placenta previa; Respiratory distress syndrome; Transient tachypnea of the newborn