Criteria of inlet contraction. What is their value?

Kaltreider, D. Frank

doi:10.1016/0002-9378(51)91159-3

Cited by 17 publications

(1 citation statement)

References 4 publications

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“…Several studies, using a variety of clinical assessment modalities, have been published in an attempt to predict which women have CPD before the onset of labor [ 1 - 4 ]. No single modality or assessment protocol at present has been able to reliably predict successful vaginal delivery before labor [ 2 ]. Radiographic methods for the prediction of CPD have become less popular, as they have been shown to have poor predictive value [ 3 , 4 ].…”

Section: Introductionmentioning

confidence: 99%

Measurement of retropubic tissue thickness using intrapartum transperineal ultrasound to assess cephalopelvic disproportion

et al. 2018

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PurposeFirst, to describe a new method of assessing cephalopelvic disproportion by measuring the retropubic tissue thickness (RTT), and second, to determine whether RTT was associated with an eventual delivery by cesarean section.MethodsThree-dimensional transperineal ultrasound scans were performed on 129 laboring nulliparous women to obtain 3-dimensional volume datasets for assessing RTT. RTT was measured off-line by three operators (A, B, and C) as the shortest distance between the capsule of the pubic symphysis and the outer border of the fetal skull. The intraoperator repeatability of operator A and the interoperator reproducibility among A, B, and C were determined. The RTT in women who were delivered by cesarean section due to failure to progress was compared to that of women who had a vaginal delivery.ResultsThe intraoperator repeatability for RTT was 1.2 mm. The overall RTT interoperator interclass correlation was 0.97 (0.95-0.98). The RTT in women who had a spontaneous, instrumental, or cesarean delivery was 1.16±0.32 cm, 1.12±0.25 cm, and 0.94±0.25 cm, respectively. Women who were delivered by cesarean section had a significantly smaller RTT than women who had a spontaneous delivery (P=0.008). There was no statistically significant difference in RTT between patients who had a normal vaginal delivery and patients who had an instrumental delivery (P=0.990), or between those who had an instrumental delivery and those who had a cesarean delivery after the Bonferroni correction (P=0.120).ConclusionRTT can be measured with satisfactory intraoperator repeatability and interoperator reproducibility. RTT was significantly smaller in women who eventually had a cesarean delivery than in those who had a vaginal delivery.

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Section: Introductionmentioning

confidence: 99%

Measurement of retropubic tissue thickness using intrapartum transperineal ultrasound to assess cephalopelvic disproportion

et al. 2018

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Radiological Estimation of Pelvic Expansion

Weinberg¹

1954

JAMA

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It has long been recognized that the usual obstetric patient will deliver her second and third babies with greater ease and with shorter labor than her first. This is true even though customarily the birth weight of each succeeding child shows a slight increase over that of its predecessor. The decrease in dystocia in each succeeding delivery has in the past been attributed to the dilatation and lacerations of the soft parts of the birth canal, the lower uterine segment, cervix, vagina, and perineum. On this basis one would expect all multiparous deliveries, without positional dystocia, to be easier, provided the contractions are efficient and the increase in the size of the baby not excessive. However, an appreciable percentage of primiparous and multiparous second stage labors resemble each other closely. It is, therefore, necessary to consider that other factors may be responsible for inconsistent prognostications of multiparous deliveries.Heretofore the incidence, degree, and clinical significance of pelvic expansion during pregnancy and labor have never been accurately estimated. Allen 1 has noted that the usefulness of pelvimetry at the midplane level is limited, owing to the physiological increases in the diameters possible during labor. Moir and others 2 have stated that, if pelvic measurements are inadequate in the cavity or outlet only, some 25% of easy deliveries may occur, especially in multíparas, because of pelvic expansion. Allen has further remarked that at the midplane the difficulties of deciding whether vaginal delivery is possible are even greater than at the inlet. "This is partly because of greater moulding of the skull and partly because the diameters at these lower levels are capable of physiological increase during labor." Stander (1945), for example, considers that an exaggerated Sims posi¬

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Clinical Evaluation of Pelvicephalography

King¹

1959

JAMA

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Criteria of inlet contraction. What is their value?

Cited by 17 publications

References 4 publications

Measurement of retropubic tissue thickness using intrapartum transperineal ultrasound to assess cephalopelvic disproportion

Measurement of retropubic tissue thickness using intrapartum transperineal ultrasound to assess cephalopelvic disproportion

Radiological Estimation of Pelvic Expansion

Clinical Evaluation of Pelvicephalography

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