Discordant Twin and Sibling Designs

2021 ◽  
pp. 234-236
Author(s):  
Ryan T. Motz
Keyword(s):  
1991 ◽  
Vol 40 (3-4) ◽  
pp. 345-351 ◽  
Author(s):  
I. Blickstein

AbstractIn order to establish a protocol considering the definition, diagnosis, and management of growth-discordant twin gestations, a questionnaire was sent to 96 authors of twin-related obstetric articles. The views of the 61 responders comprise this international census survey. The data suggest that a clear cut-off value for discordancy is still needed; however, the data indirectly supported a two-grade definition, namely, mild (> 15% and < 25% birth-weight disparity) and severe (> 25%) growth discordants. Expectant management was advocated by the majority of participants with out-patient follow-up for mild discordants, while severe discordants may preferably be hospitalized. Follow-up should be done by non-stress testing (daily - 2/wk), biophysical profile (1-2/wk), Doppler velocimetry (1/wk - bi-weekly) and sonographic biometry (bi-weekly). The opinions considering termination of pregnancy because of intertwin growth discordancy were divided; however, discordancy per se, was not considered an indication for cesarean delivery. An adapted management flowchart that summarizes the survey's data is presented and may be used as a standard for future investigations.


2006 ◽  
Vol 259 (2) ◽  
pp. 155-163 ◽  
Author(s):  
C. P. HALVORSEN ◽  
E. ANDOLF ◽  
J. HU ◽  
C. PILO ◽  
B. WINBLADH ◽  
...  

PLoS ONE ◽  
2010 ◽  
Vol 5 (9) ◽  
pp. e12609 ◽  
Author(s):  
Tuija Leskinen ◽  
Rita Rinnankoski-Tuikka ◽  
Mirva Rintala ◽  
Tuulikki Seppänen-Laakso ◽  
Eija Pöllänen ◽  
...  

Addiction ◽  
2015 ◽  
Vol 111 (2) ◽  
pp. 245-254 ◽  
Author(s):  
Pyry Sipilä ◽  
Richard J. Rose ◽  
Jaakko Kaprio

2014 ◽  
Vol 28 (4) ◽  
pp. 1177-1189 ◽  
Author(s):  
Wendy S. Slutske ◽  
Arielle R. Deutsch ◽  
Leah S. Richmond-Rakerd ◽  
Pavel Chernyavskiy ◽  
Dixie J. Statham ◽  
...  

1970 ◽  
Vol 6 (1) ◽  
pp. 46-50
Author(s):  
Alphonsus N Onyiriuka

Aim: To assess the truthfulness of this common concept that first-born twins are usually heavier than their second-born siblings at birth. Methods: In a series of 104 sets of live-born twins, the birth weights of first-born twins were compared with those of their second-born siblings, after controlling for gender. Their intra-pair birthweight differences were determined and twin pairs whose birthweight difference was 15% or more were designated as discordant. Results: Twin I was heavier than Twin II in 61.5% of cases while Twin II was heavier than Twin I in 28.9% of cases. Twins I and II had equal birth weight in 9.6% of cases. Comparing the mean birthweight of the first-born-male twin with that of second-born- male twin, it was 2515 + 427g [95 % Confidence Interval, CI = 2402 - 2628) versus 2432 + 435g (95% C I = 2321 - 2543) p>0.05. The mean birthweight of first-born-female twin was 2326 + 445g (95% CI =2214 - 2439) while that of the second-born-female twin was 2325 + 501g (95% CI = 2197 - 2453) p>0.05. When the birthweight difference exceeded 750g, the probability that Twin I will be heavier than Twin II was 83.3% (5 of 6). Conclusion: Although the first-born twin was more often heavier than their second-born siblings, either could weigh more or less at birth. The larger the birthweight difference between growth-discordant twin pair, the greater the probability that the heavier twin would be delivered first. Keywords: Birth order relative birth weights, birthweight discordance, twins DOI: http://dx.doi.org/10.3126/njog.v6i1.5252 NJOG 2011; 6(1): 46-50


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