The Value of the Placenta in the Determination of Zygosity—a Study of 1,052 Nigerian Twin Maternities

Nylander, P. P. S.

doi:10.1111/j.1471-0528.1969.tb06160.x

Cited by 32 publications

(27 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The lack of data on the type of twins delivered is not expected to affect the results obtained in the study. Nylander (1969) had reported that the occurrence of monozygotic twins in various populations worldwide is fairly constant and that the differences in twinning rates could be attributed to the occurrence of dizygotic twins.…”

Section: Methodsmentioning

confidence: 99%

Twinning Rates in Ghana

Mosuro¹,

Agyapong

Opoku-Fofie

et al. 2001

Twin Research

View full text Add to dashboard Cite

Section: Methodsmentioning

confidence: 99%

Twinning Rates in Ghana

Mosuro¹,

Agyapong

Opoku-Fofie

et al. 2001

Twin Research

View full text Add to dashboard Cite

“…A much higher figure of 94.8% was reported from Ibadan, Nigeria (Nylander, 1969). These differences may be related to the differences in the rates of DZ twinning in the studied populations.…”

Section: Twin Research and Human Genetics February 2007mentioning

confidence: 65%

“…These differences may be related to the differences in the rates of DZ twinning in the studied populations. Fused dichorionic placentation being the most common was also reported from Ibadan (Nylander, 1969) and St Louis, Missouri, United States (Victoria et al, 2001), although in Poland separate dichorionic placentation was the most common (Malinowski, 2003). The monochorionic monoamniotic placentation prevalence of 0.1% in this study is far lower than the 1.1% and 1.3% reported in other studies (Hanley et al, 2002;Victoria et al, 2001); it is significant to note, however, that a similarly low prevalence of 0.2% was reported from Ibadan (Nylander, 1969).…”

Section: Twin Research and Human Genetics February 2007mentioning

confidence: 99%

“…Work has been done on twin placentation in Nigeria (Nylander, 1969) but no such work has been reported from Ghana, though both countries are closely linked in the West African subregion.…”

mentioning

confidence: 99%

“…In general, a greater proportion of twins are dichorionic than monochorionic (Hanley et al, 2002;Malinowski, 2003;Minakami et al, 1999;Nylander, 1969;Victoria et al, 2001) although a greater proportion of monochorionic was reported in Japan over 20 years ago (Yoshida & Soma, 1984). Monochorionic twins have been reported, when compared to dichorionic, to have higher incidences of preterm birth, severe birthweight discordance, low birthweight, perinatal mortality of at least one twin and admission to the neonatal intensive care unit (Ferreira et al, 2005;Leduc et al, 2005;Machin, 2001;Minakami et al, 1999;Victoria et al, 2001).…”

mentioning

confidence: 99%

See 2 more Smart Citations

Pattern of Twin Placentation in Ghana

Nkyekyer¹,

Boafor

2007

Twin Res Hum Genet

View full text Add to dashboard Cite

A 2-year study involving macroscopic examination of twin placentae was conducted at the Korle Bu Teaching Hospital in Accra, Ghana to determine the proportions of the various types of twin placentation, cord insertions and number of cord vessels and their relationships. Of 765 twin-pair placentae examined, 398 (52%, 95% confidence interval [CI] 48.4%–55.6%) had fused dichorionic, 247 (32.3%, 95% CI 29.0%–35.7%) had separate dichorionic, and 119 (15.6%, 95% CI 13.1%–18.4%) had monochorionic diamniotic placentae; only one (0.1%, 95% CI 0.0%–0.8%) had monochorionic monoamniotic placentation. Of 1529 cords whose insertion could be determined, 1285 (84%) had disc, 172 (11.2%) marginal and 72 (4.7%) velamentous insertions. Only 10 (0.65%) cords had two vessels (i.e., single umbilical artery). Abnormal cord insertions (marginal and velamentous) were significantly more likely to occur in monochorionic than in dichorionic placentation (odds ratio [OR] 3.56, 95% CI 2.62–4.84), and in two-vessel than in three-vessel cords (OR 5.79, 95% CI 1.44–24.5). The prevalence of two-vessel cord in monochorionic was not significantly different from that in dichorionic placentation (OR = 0.60, 95% CI 0.10–2.67). Zygosity could be determined in 53.3% of twins from placental examination and babies' sex-pair combinations. In conclusion the most common twin placentation in Ghana is fused dichorionic. Abnormal cord insertion is more common in monochorionic than dichorionic placentation. Monoamniotic twins and single umbilical artery are less common than have been reported in other centers. Modern methods of DNA analysis are needed to establish zygosity in almost half of twin pairs.

show abstract

The Placenta in Multiple Pregnancy

Baldwin

1994

Pathology of Multiple Pregnancy

View full text Add to dashboard Cite

The Value of the Placenta in the Determination of Zygosity—a Study of 1,052 Nigerian Twin Maternities

Cited by 32 publications

References 11 publications

Twinning Rates in Ghana

Twinning Rates in Ghana

Pattern of Twin Placentation in Ghana

The Placenta in Multiple Pregnancy

Contact Info

Product

Resources

About