Analysis of Parental Abnormal Chromosomal Karyotype and Subsequent Live
Births in Chinese Couples with Recurrent Miscarriage
Abstract
Objective: To identify the influence of parental abnormal chromosomal
karyotype on the pregnancy outcomes of recurrent miscarriage (RM)
couples. Design: Retrospective cohort study. Setting and Population:
3235 RM couples who experienced two or more miscarriages before 20 weeks
were diagnosed in our tertiary referral unit of a university hospital
during 2008 to 2018. Main Outcome Measure(s): The frequency and
distribution of 121 carriers were described. Pregnant RM carriers (n=55)
and non-carriers (n=229) were compared in the etiological factors and
pregnancy outcomes. Result(s): Chromosome aberration was detected in 121
(3.74%) among 3235 RM couples which included 75 female and 46 male
cases at an individual level. 101 cases were structural aberrations
including balanced translocations in 46(38.0%) cases, Robertsonian
translocations in 13(10.7%) cases, inversions in 42(34.7%) cases and
20(16.5%) cases were numerical aberrations. 121 carriers during 2008 to
2018 and 428 non-carriers in the 2018 were followed up for two years. 55
carriers and 229 non-carriers were subsequent pregnant after diagnosis
by natural conception or intrauterine insemination. The frequency of
carriers to have a health newborn was not significantly different with
non-carriers (72.7% vs. 71.2%, adjusted p=0.968). Conclusion(s): This
study described the majority of carriers were balanced translocations
and chromosome aberrations had a limited influence on live birth rate
from the present data. The results of the study also remind us that
natural conception may be also a good alternative rather than PGD
(Pre-implantation Genetic Diagnosis) which is common in many other
reproductive centers for such patients.