Sono-embryological assessments of a true knot that developed into a hypercoiled cord and circumvallate placenta

Hasegawa, Junichi; Furuya, Natsumi; Doi, Masatomo; Sasaki, T; Takagi, Masayuki; Suzuki, Nao

doi:10.1080/14767058.2019.1704247

Cited by 3 publications

(11 citation statements)

References 7 publications

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“…A total of 963 studies were screened. Of these, 48 studies comprising 1625 pregnant women with abnormal placenta and 167,566 pregnant women without abnormal placentas met the inclusion criteria of the current systematic review for descriptive analysis [ 3 , 9 , 10 , 11 , 12 , 13 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 , 52 , 53 , 54 , 55 , 56 , 57 , 58 , 59 , 60 , 61 , 62 , 63 , 64 , 65 ].…”

Section: Results Of the Systematic Reviewmentioning

confidence: 99%

“…The metadata of the 48 eligible studies are shown in Supplementary Table S1 [ 3 , 9 , 10 , 11 , 12 , 13 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 , 52 , 53 , 54 , 55 , 56 , 57 , 58 , 59 , 60 , 61 , 62 , 63 , 64 , 65 ]. The eligible studies were published between 1974 and 2022.…”

Section: Results Of the Systematic Reviewmentioning

confidence: 99%

“…All studies were retrospective in nature, and none of them were randomized controlled studies. Of the included studies ( n = 48), 26 were case reports [ 3 , 25 , 27 , 29 , 32 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 , 47 , 48 , 49 , 50 , 51 , 53 , 56 , 57 , 58 , 63 , 64 , 65 ], 4 were case series [ 33 , 59 , 60 , 61 ], and the remaining 18 were original research articles [ 9 , 10 , 11 , 12 , 13 , 24 , 26 , 28 , 30 , 31 , 34 , 44 , 45 , 46 , 52 , 54 , 55 , 62 ]. The majority of the studies (approximately one-third) were from the United States of America ( n ...…”

Section: Results Of the Systematic Reviewmentioning

confidence: 99%

“…Of the included studies ( n = 48), 26 were case reports [ 3 , 25 , 27 , 29 , 32 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 , 47 , 48 , 49 , 50 , 51 , 53 , 56 , 57 , 58 , 63 , 64 , 65 ], 4 were case series [ 33 , 59 , 60 , 61 ], and the remaining 18 were original research articles [ 9 , 10 , 11 , 12 , 13 , 24 , 26 , 28 , 30 , 31 , 34 , 44 , 45 , 46 , 52 , 54 , 55 , 62 ]. The majority of the studies (approximately one-third) were from the United States of America ( n = 15, 31.3%) [ 10 ...…”

Section: Results Of the Systematic Reviewmentioning

confidence: 99%

“…Data regarding circumvallate placenta were available in 18 studies [ 9 , 10 , 11 , 12 , 24 , 26 , 28 , 29 , 30 , 31 , 36 , 44 , 45 , 52 , 54 , 55 , 57 , 62 ]; 20 studies [ 9 , 13 , 24 , 27 , 28 , 30 , 31 , 35 , 37 , 40 , 41 , 43 , 44 , 46 , 47 , 49 , 51 , 60 , 61 , 63 ] included data regarding succenturiate lobe placenta; and 10 studies [ 3 , 9 , 24 , 28 , 32 , 33 , 38 , 39 , 48 , 50 ] had data regarding multilobed placenta. Eight studies [ 34 , 42 ...…”

Section: Results Of the Systematic Reviewmentioning

confidence: 99%

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Relationship between Abnormal Placenta and Obstetric Outcomes: A Meta-Analysis

et al. 2023

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The placenta has several crucial physiological functions that help maintain a normal pregnancy. Although approximately 2–4% of pregnancies are complicated by abnormal placentas, obstetric outcomes remain understudied. This study aimed to determine the outcomes and prevalence of patients with abnormal placentas by conducting a systematic review of 48 studies published between 1974 and 2022. The cumulative prevalence of circumvallate placenta, succenturiate placenta, multilobed placenta, and placenta membranacea were 1.2%, 1.0%, 0.2%, and 0.004%, respectively. Pregnancies with a circumvallate placenta were associated with an increased rate of emergent cesarean delivery, preterm birth (PTB), and placental abruption compared to those without a circumvallate placenta. The succenturiate lobe of the placenta was associated with a higher rate of emergent cesarean delivery, whereas comparative results were observed in terms of PTB, placental abruption, and placenta previa in comparison to those without a succenturiate lobe of the placenta. A comparator study that examined the outcomes of multilobed placentas found that this data is usually unavailable. Patient-level analysis (n = 15) showed high-rates of abortion (40%), placenta accreta spectrum (40%), and a low term delivery rate (13.3%) in women with placenta membranacea. Although the current evidence is insufficient to draw a robust conclusion, abnormal placentas should be recognized as a high-risk factor for adverse outcomes during pregnancy.

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Section: Results Of the Systematic Reviewmentioning

confidence: 99%

Section: Results Of the Systematic Reviewmentioning

confidence: 99%

Section: Results Of the Systematic Reviewmentioning

confidence: 99%

Section: Results Of the Systematic Reviewmentioning

confidence: 99%

Section: Results Of the Systematic Reviewmentioning

confidence: 99%

See 3 more Smart Citations

Relationship between Abnormal Placenta and Obstetric Outcomes: A Meta-Analysis

et al. 2023

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Knots of the umbilical cord: Incidence, diagnosis, and management

Al Qasem,

Meyyazhagan,

Tsibizova

et al. 2024

Intl J Gynecology & Obste

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Knot(s) of the umbilical cord have received emphasis because the clinical assessments and sonographic literature show a crucial role in fetal outcomes. The true umbilical cord knot could be a knot in a singleton pregnancy or an entanglement of two umbilical cords in monoamniotic twins. Clinical manifestations are almost silent, which can raise clinical challenges. They worsen outcomes, and the pathology can be easily missed during prenatal visits because ultrasonographers do not pay attention to the cord during an obstetric ultrasound scan. However, most medical centers now have ultrasound machines that improve fetal assessment. The umbilical cord should be routinely evaluated during a fetal assessment, and suspicion of an umbilical cord knot can be more frequently diagnosed and is detected only incidentally. Clinical outcome is usually good but depends on the knot's characteristics and if it is tight or loose. In this review, we discuss pathophysiology, the theories on formation, the main risk factors, ultrasound signs and findings, different opinions in the management, and features of pregnancy outcomes feature.

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