Malpresentations and Shoulder Dystocia

Lanni, Susan; Seeds, John W.

doi:10.1016/b978-1-4377-1935-2.00018-1

Cited by 3 publications

(4 citation statements)

References 105 publications

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“…Since the pioneering Caldwell-Moloy classification system was established [ 5 , 10 ], considerable research has been performed into pelvimetry by radiological means. A consensus has emerged that radiographic pelvimetry by means of radiography, CT, MRI, and US enables precise assessment of pelvic size and type; however, radiographic pelvimetry cannot reliably predict or diagnose CPD [ 5 , 12 , 16 , 17 , 18 , 19 ]. Considering the nature of labor and delivery, it would not be realistic to expect radiographic modalities alone to successfully predict all the cases of CPD.…”

Section: Discussionmentioning

confidence: 99%

“…To make it easier to define pelvic type, the pelvis was defined according to its posterior characteristics, taking into account its anterior characteristics if present [ 5 ]. In addition to the parameters set forth in table 1 , we used cutoff values for pelvimetric measurements included in textbooks related to childbirth, such as those for pelvic inlet, midpelvis, and pelvic outlet [ 7 , 8 , 11 , 12 ].…”

Section: Methodsmentioning

confidence: 99%

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Determining the Incidence of Gynecoid Pelvis Using Three-Dimensional Computed Tomography in Nonpregnant Multiparous Women

Şalk¹,

Çetin

Şalk

et al. 2015

Med Princ Pract

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Objectives: To determine the incidence of gynecoid pelvis by using classical criteria and measured parameters obtained from three-dimensional computed tomography (3D CT) pelvimetry in nonpregnant multiparous women who delivered vaginally. Subjects and Methods: Our hospital's picture archiving and communication system was reviewed retrospectively. All adult women who had undergone CT examination with routine abdominal protocols were identified. In the pelvic inlet, midpelvis, and pelvic outlet, classical criteria and measured parameters, both alone and in combination, were used to determine the presence of gynecoid pelvis. Results: 3D CT pelvimetry was performed on 226 women aged 23-65 years without any history of cephalopelvic disproportion and who had at least one delivery of an average fetal size (>2,500 g). The median parity was 4, and the mean (±SD) birth weight was 3,700 ± 498 g. Compared to the classical criteria, measured parameters and their combined use with the classical criteria significantly reduced the frequency of gynecoid pelvis (51.3 and 47.8%, respectively, vs. 71.6%; p = 0.001); however, there was no significant difference between the measured parameters and their combined use with classical criteria with regard to the frequencies of gynecoid pelvis (p > 0.05). Conclusions: With the use of measured parameters of 3D CT pelvimetry, the incidence of gynecoid pelvis reduces to a more acceptable level (51.3%) in accordance with obstetric knowledge. Since there is no considerable decrease with the addition of classical criteria, 3D CT pelvimetry alone has merit for determining a woman's pelvic capacity for obstetric needs after the improvement and standardization of measured parameters.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Determining the Incidence of Gynecoid Pelvis Using Three-Dimensional Computed Tomography in Nonpregnant Multiparous Women

Şalk¹,

Çetin

Şalk

et al. 2015

Med Princ Pract

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“…This finding is in agreement with previous studies examining various risk factors for autism, in which, in addition to CD, other risk factors were suggested including paternal age, small for gestational age, low Apgar scores, and malpresentation. 33 Fetuses with neurological illness are recognized as those with a higher likelihood to have nonvertex presentation, possibly because of an abnormal head morphology and anatomy and due to neuromuscular defects preventing a timely version. 32 In an effort to isolate the pure impact of delivery mode on future neurological morbidity, we performed a subgroup analysis in which malpresenting fetuses were excluded.…”

Section: Discussionmentioning

confidence: 99%

“…Known sociodemographic risk factors for PDD spectrum children include higher sociodemographic status, older mothers, and first-born infants. 33 These are all known risk factors for elective CD as well. Although in our regression models we accounted for several of these factors, and in view of the retrospective nature of our study, we cannot account for all confounders.…”

mentioning

confidence: 99%

Elective Cesarean Delivery at Term and the Long-Term Risk for Neurological Morbidity of the Offspring

et al. 2018

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Parturition process in an amphibian mammal species: new evidences in South American fur seal (Arctocephalus australis)

et al. 2016

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In mammals, the transition from a terrestrial to an aquatic environment has implied a great number of adaptations. While in terrestrial mammals the presentation of the foetus at birth is typically cephalic, in strictly aquatic mammals as cetaceans and sirenians the presentation of the foetus is mainly breech. The order Pinnipedia is the most recently evolved group of marine mammals and has an amphibian lifestyle. We document, for the first time, the parturition process in the largest breeding colony of the South American fur seal Arctocephalus australis in Uruguay and compare our results with the scarce information available for other species. The analysis of the parturition processes shows that the cephalic/breech birth ratio was 1. In this species, the presentation of the foetus did not affect the total duration of the parturition process, but the cephalic presentation implied a significantly lower duration of the stage 1 of birth, a trend that is also observed in other Otariid species. Phylogenetic reconstructions suggest that O. flavescens and E. jubatus are older than the Arctocephalus genus, having their most recent common ancestor dated between 5-5.8 mybp. Within the Arctocephalus genus, A. australis would be the most recent species (0.7 mybp). In this light, the skewed ratios of breech presentation in older otariids species may suggest a convergent adaptation toward the aquatic life. We hope this finding will promote an increase of studies aiming for a more detailed examination on the adaptive processes involved in the selection of both types of fetal presentations, and their potential effect on the survival of the pup.

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Malpresentations and Shoulder Dystocia

Cited by 3 publications

References 105 publications

Determining the Incidence of Gynecoid Pelvis Using Three-Dimensional Computed Tomography in Nonpregnant Multiparous Women

Determining the Incidence of Gynecoid Pelvis Using Three-Dimensional Computed Tomography in Nonpregnant Multiparous Women

Elective Cesarean Delivery at Term and the Long-Term Risk for Neurological Morbidity of the Offspring

Parturition process in an amphibian mammal species: new evidences in South American fur seal (Arctocephalus australis)

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