Persistence of Placenta Previa According to Gestational Age at Ultrasound Detection

Dashe, Jodi S.; McIntire, Donald D.; Ramus, Ronald M.; Santos‐Ramos, Rigoberto; Twickler, Diane M.

doi:10.1097/00006250-200205000-00005

Cited by 70 publications

(86 citation statements)

References 10 publications

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“…The frequency of placenta praevia with previous cesarean section came out 61% which is very high (Table 1), that is clearly consistent with other renowned studies regarding this topic. [1] Similar results were also obtained in a study during the period of 1977-1983 in Loss Angeles hospital series [2].…”

Section: Discussionsupporting

confidence: 82%

Placenta Previa with history of Previous Caesarean Delivery â an obstetrician's nightmare

Mazumder

Rouf

Sarkar

2017

JWRH

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Section: Discussionsupporting

confidence: 82%

Placenta Previa with history of Previous Caesarean Delivery â an obstetrician's nightmare

Mazumder

Rouf

Sarkar

2017

JWRH

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“…In contrast, those placentas previa that yielded a placental distance from the internal cervical os of more than 3.0 cm at final examination had a mean rate of migration of 4.1 mm/wk. A slower rate of placental migration was directly related to a lesser placental distance from the internal cervical os [8,[13][14][15]. These findings are similar to those of a previous report in which the mean rates of placental migration were 0.3 and 5.4 mm/ wk for those patients who had CD versus normal vaginal delivery, respectively [5,7,[9][10].…”

Section: Discussionsupporting

confidence: 82%

Placental Migration and Its Role in Prediction of Route of Delivery

Bonigala¹,

Ramchan²

2018

IJCBR

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INTRODUCTIONPlacental migration is a phenomenon that was described by serial sonographic examinations by many authors. The presence of a lowlying also termed as placenta previa in the second trimester of pregnancy can be converted to an upper uterine segment placenta by the end of the third trimester [1]. This phenomenon is important when a complete or marginal placenta previa is encountered in the second trimester of gestation because of the need to predict possible antepartum complications and mode of delivery [2]. Placenta previa can be defined as one that covers the internal os of the cervix and lowlying placenta as one of which the edge is 1mm to 20mm of the internal os [3]. A distance of more than 20 mm from the lower placental edge and cervical internal os in the second trimester is a normal finding that does not represent a lowlying placenta and does not require followup.In cases of suspected placenta previa or lowlying placenta, the first step in determining accurate placental position in relation to the cervix is to perf orm a trans-vaginal-ultrasound-scan (TVUS) on patient whose bladder is empty [4,5,6,7]. In at least one quarter of all cases of placenta previa or lowlying placenta suspected on the basis of transabdominal sonograph y in the second trimester, the diagnosis will change after TVU is performed [3,5,7].Those patients who do not have placenta previa or lowlying placenta can then be reassured and will require no further follow up. The aim of the present study was to compare the rates and patterns of placental migration in the third trimester of pregnancy and to correlate these findings with the mode of delivery. MATERIALS AND METHODS Study design: Prospective analytical studyEthics approval: The study was approved by the Institutional Ethics Committee, and informed consent was obtained from each participant. Place of research: The ABSTRACT Introduction: The presence of a lowlying in the second trimester of pregnancy can be converted to an upper uterine segment placenta by the end of the third trimester. This phenomenon is important when a complete or marginal placenta previa is encountered in the second trimester of gestation because of the need to predict possible antepartum complications and mode of delivery. Aim: To examine the migration of placenta and the placental marginal sinus to predict the eventual route of delivery in low-lying placenta. Methodology: Women with a low-lying placenta with 30 weeks of gestation were included for study. The distance between the internal os and leading edge of the placenta was measured fortnightly using transvaginal ultrasonography until 36 weeks gestation. The relationship between the rate of placental migration, the presence of a placental marginal sinus and the eventual mode of delivery was investigated. Results: In the present study cesarean section rate was 60 % (39/65) in the slow migration group (0 -2.0 mm/week) group, six patients (6/35) in the fast (more than 2.0 mm/week) migration group underwent a cesarean section (p < 0.01) because of other...

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“…Thirty-four percent, 49%, 62%, and 73% of placentas previa would persist as such if diagnosed at 20 to 23, 24 to 27, 28 to 31, and 32 to 35 weeks' gestation, respectively. 9 The process of trophotropism may explain the disappearance of the placental tissue that overlaps the internal cervical os by up to 20 mm and then is found to be only adjacent to the internal cervical os. 6 However, when the placenta previa covered the internal cervical os by more than 2.0 cm (eg, central previa), no placental migration was observed, 6 or placental migration was present but would have caused substantial bleeding requiring delivery, so no measurable migration was documented.…”

Section: Discussionmentioning

confidence: 99%

A Sonographic Assessment of Different Patterns of Placenta Previa “Migration” in the Third Trimester of Pregnancy

Predanić

Perni

Baergen

et al. 2005

Journal of Ultrasound in Medicine

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Objective. The purpose of this study was to compare the rates and patterns of placental "migration" with the mode of fetal and placental delivery and the incidence of peripartum complications. Methods. This was a retrospective study of 163 cases of placenta previa diagnosed by transvaginal sonography at 28 weeks' gestation that were followed serially by sonography. The patients were stratified into 3 groups depending on the placenta-to-internal cervical os distance: (1) an overlap of 0.0 cm or greater over the cervical os, (2) 0.1 to 2.9 cm, and (3) 3.0 cm or greater. The mean rate of placental migration (millimeters per week) was obtained at 28 to 32 and 32 to 36 weeks' gestation. A pattern of placental migration was classified as one with acceleration or deceleration of the placental migration in the late third trimester based on a comparison between the migration rates at 28 to 32 and 32 to 36 weeks' gestation. Results. At the time of delivery, 22, 29, and 112 patients were included in groups 1, 2, and 3, respectively. The rates of placental migration correlated with the final placental distance from the internal cervical os (0.1 to 4.1 mm/wk for groups 1 and 3, respectively). Significantly higher rates of interventional cesarean delivery (CD) (P = .0002), elective CD (P = .0254), manual placenta removal (P = .0419), and placenta accreta (P = .0039), but not CD for indications other than placenta previa (P = .0752), were associated with a placental distance of less than 2.0 cm away from the cervix and a deceleration pattern of placental migration. In contrast, vaginal delivery was significantly associated with a placental distance of 2.0 cm or greater away from the cervix and an acceleration pattern of placental migration (P = .0034). Conclusions. A final placental distance of less than 2.0 cm from the internal cervical os and a deceleration pattern of placental migration were significantly associated with an interventional CD and a higher rate of peripartum complications. Key words: mode of delivery; placenta previa; rate of migration; sonography. lacental "migration" is a phenomenon that was previously described by serial sonographic examinations that documented the presence of a lowlying or placenta previa in the second trimester of pregnancy with subsequent conversion to an upper uterine segment placenta by the end of the third trimester.

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Persistence of Placenta Previa According to Gestational Age at Ultrasound Detection

Cited by 70 publications

References 10 publications

Placenta Previa with history of Previous Caesarean Delivery â an obstetrician's nightmare

Placenta Previa with history of Previous Caesarean Delivery â an obstetrician's nightmare

Placental Migration and Its Role in Prediction of Route of Delivery

A Sonographic Assessment of Different Patterns of Placenta Previa “Migration” in the Third Trimester of Pregnancy

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Persistence of Placenta Previa According to Gestational Age at Ultrasound Detection

Cited by 70 publications

References 10 publications

Placenta Previa with history of Previous Caesarean Delivery â an obstetrician's nightmare

Placenta Previa with history of Previous Caesarean Delivery â an obstetrician's nightmare

Placental Migration and Its Role in Prediction of Route of Delivery

A Sonographic Assessment of Different Patterns of Placenta Previa “Migration” in the Third Trimester of Pregnancy

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Product

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Placenta Previa with history of Previous Caesarean Delivery â an obstetrician's nightmare

Placenta Previa with history of Previous Caesarean Delivery â an obstetrician's nightmare