Reduction of twin pregnancy to singleton: does it improve pregnancy outcome?
OBJECTIVE
To compare pregnancy complications, obstetrical and neonatal outcome of twin pregnancies reduced to singleton, with both non-reduced twin pregnancies and singleton pregnancies.


METHODS
A retrospective case-control study was performed at the Obstetrics and Gynecology Ultrasound unit of a tertiary referral medical center. Patient's population included 32 bi-chorionic bi-amniotic twin pregnancies reduced to singleton and 35 non-reduced twin pregnancies. Thirty-six patients with singleton pregnancies comprised the second control group. Main outcome measures were rates of pregnancy complications, preterm delivery (both before 37 weeks of gestation and before 34 weeks of gestation), late abortions, intra-uterine growth retardation, cesarean section, mean birth weights, and mean gestational age at delivery.


RESULTS
The reduced twin pregnancies group had similar rates of total pregnancy complications, preterm deliveries, and cesarean section as non-reduced twins. Gestational age at delivery and mean birth weight were also similar to non-reduced twins and significantly different compared with singletons. Preterm delivery and late abortion incidences were significantly higher when reduction was beyond 15 weeks gestation.


CONCLUSIONS
Reduction of twin pregnancy to singleton does not change significantly pregnancy course and outcome. Favorable obstetrical and neonatal outcomes could be achieved by performing early, first trimester reductions.
Ultrasound Unit, Obstetrics and Gynecology Department, Lis Maternity Hospital, Tel Aviv Sourasky Medical Center, Tel Aviv, Israel. y.r.hasson@gmail.com
Joseph
J
Hasson
Amir
A
Shapira
Ariel
A
Many
Ariel
A
Jaffa
Joseph
J
Har-Toov
D000328:Adult; D001724:Birth Weight; D016022:Case-Control Studies; D002585:Cesarean Section / Q000706:statistics & numerical data; D005260:Female; D005317:Fetal Growth Retardation / Q000453:epidemiology; D005865:Gestational Age; D006801:Humans; D007231:Infant, Newborn; D011247:Pregnancy; D011248:Pregnancy Complications / Q000453:epidemiology / Q000517:prevention & control*; D011256:Pregnancy Outcome; D018607:Pregnancy Reduction, Multifetal; D059285:Pregnancy, Twin; D047928:Premature Birth / Q000453:epidemiology; D012189:Retrospective Studies; D014427:Twins