Natural history of placenta previa ascertained by diagnostic ultrasound

Rizos, N.; Doran, T.A.; Miskin, M.; Benzie, R.; Ford, J.A.

doi:10.1016/0002-9378(79)90680-x

Cited by 82 publications

(21 citation statements)

References 9 publications

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“…Other authors have indicated that diagno sis of placenta praevia in mid-trimester does not signify the prognosis of placenta praevia at birth [15,27], which can be accounted for by the phenomenon of placenta migration [22], We have observed the said phenome non in our study. It is with regard to the migration phenomenon that in the present study we speak of placenta insertion within a strictly defined period of gestation.…”

Section: Incidence O F Low-lying Placenta and Placenta Praeviasupporting

confidence: 69%

“…In regard to the migration phenomenon described in the literature [17,22,27] we decided to calculate the percentage of lowlying placenta and placenta praevia cases within a strictly defined period of gestation. Thus, in the 32nd week of pregnancy lowlying placenta was diagnosed in 143 out of the 1,829 ultrasonographically examined women (7.8%); placenta praevia, on the other hand, was diagnosed in 12 cases (0.65%).…”

Section: Incidence O F a Low-lying Placenta And Placenta Praeviamentioning

confidence: 99%

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Can a Low-Lying Placenta Be the Risk Factor of Cervical Incompetence?

Uszyński¹,

Majczynski²,

Uszyński³

1985

Gynecol Obstet Invest

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An attempt was made to verify the hypothesis that a low-lying placenta may be a factor leading to the dynamic form of cervical incompetence. A vaginal evaluation of the cervix was made in 143 pregnant women who by means of ultrasonographic method were found to have low-lying placentas. In as many as 68 out of the 143 studied cases (47.5%), the low-lying placenta coincided with a shortening of the cervix about half its normal length or in both shortening and patency of the uterocervical canal, measuring up to 2 cm in diameter (39 cases). The statistical calculations indicate that a low-lying placenta can influence cervical behaviour and that it appears to be a risk factor of cervical incompetence.

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Section: Incidence O F Low-lying Placenta and Placenta Praeviasupporting

confidence: 69%

Section: Incidence O F a Low-lying Placenta And Placenta Praeviamentioning

confidence: 99%

Can a Low-Lying Placenta Be the Risk Factor of Cervical Incompetence?

Uszyński¹,

Majczynski²,

Uszyński³

1985

Gynecol Obstet Invest

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“…Previous studies have shown that about 90% of cases of asymptomatic placenta praevia in the second trimester remained asymptomatic and subsequently became normally situated (Ritzos et al, 1979;Rose and Chapman, 1986). The mechanism by which the placenta migrates away from the cervix and lower uterine segment with advancing gestational age is not fully understood.…”

Section: Discussionmentioning

confidence: 94%

“…Ritzos et al (1979) and Gillieson et al (1982) reported that 5 -6% of placentae were found to be low-lying in the second trimester. In our study, 14.6% of pregnant women scanned at 12 -14 weeks' gestation showed a low-lying placenta.…”

Section: Discussionmentioning

confidence: 97%

“…This has been attributed to the common practice of early ultrasound scan for the detection of fetal abnormalities and other pregnancy complications (Kwawukume, 2002). However, most cases of placenta praevia detected in the second trimester will resolve by term (Ritzos, 1979). The purpose of this study is to follow the antenatal events in women with low-lying placenta detected at 12 -14 weeks' gestation until delivery.…”

Section: Introductionmentioning

confidence: 99%

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From low-lying implantation to placenta praevia: a longitudinal ultrasonic assessment

Chama

Wanonyi

Usman

2004

Journal of Obstetrics and Gynaecology

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A study of 895 consecutive pregnant women studied by transabdominal ultrasound scan showed an incidence of 14.6% of low-lying placenta at 12-14 weeks' gestation. Longitudinal follow-up of those with low-lying placenta showed that 85% of them had normally situated placenta at term. However, for those with partial or total placenta praevia at 30 weeks' gestation, 60% and 75%, respectively, persisted as major placenta praevia at term. A total of 45% of those with low-lying placenta at recruitment had threatened abortion while 15.7% had antepartum haemorrhage. The caesarean section rate was as high as 26% among the study population compared with 8.4% among the general population (P < 0.005). It is recommended that all antenatal women should have at least one ultrasound scan in the second or third trimester for placental localisation. Those found to have major placenta praevia in the third trimester should be closely followed-up.

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Routine ultrasound in late pregnancy (after 24 weeks' gestation)

Bricker¹,

Neilson²

2007

The Cochrane Database of Systematic Reviews

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Natural history of placenta previa ascertained by diagnostic ultrasound

Cited by 82 publications

References 9 publications

Can a Low-Lying Placenta Be the Risk Factor of Cervical Incompetence?

Can a Low-Lying Placenta Be the Risk Factor of Cervical Incompetence?

From low-lying implantation to placenta praevia: a longitudinal ultrasonic assessment

Routine ultrasound in late pregnancy (after 24 weeks' gestation)

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