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Ramirez Zegarra R, Dall'Asta A, Di Pasquo E, Morganelli G, Falcone V, Lizarraga Cepeda E, Falvo G, Bontempo P, Kiener AJO, Fieni S, Ghi T. Prediction of persistent occiput posterior position by sonographic assessment of fetal head attitude at start of second stage of labor: prospective study. ULTRASOUND IN OBSTETRICS & GYNECOLOGY : THE OFFICIAL JOURNAL OF THE INTERNATIONAL SOCIETY OF ULTRASOUND IN OBSTETRICS AND GYNECOLOGY 2024; 63:251-257. [PMID: 37610831 DOI: 10.1002/uog.27461] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/23/2023] [Revised: 08/09/2023] [Accepted: 08/11/2023] [Indexed: 08/25/2023]
Abstract
OBJECTIVES To evaluate the relationship between the attitude of the fetal head quantified by means of the chin-to-chest angle (CCA) in fetuses in occiput posterior (OP) position at the beginning of the second stage of labor, and persistent OP position at birth. METHODS This was a single-center, prospective observational study conducted at the University Hospital of Parma, Parma, Italy. We included singleton pregnancies at term with fetuses in the OP position at the beginning of the second stage of labor. The fetal head position, station by means of angle of progression and head-to-perineum distance, and attitude by means of CCA were assessed using transabdominal or transperineal ultrasound. The primary outcome was persistent OP position at birth. RESULTS Between January and July 2022, 76 women were included in the study. There were 48 (63.2%) spontaneous rotations of the fetal head and spontaneous vaginal delivery occurred in all. Among the 28 (36.8%) fetuses that did not rotate spontaneously into an occiput anterior position, eight (28.6%) had a spontaneous vaginal delivery, while operative vaginal delivery and Cesarean delivery was performed in 11 (39.3%) and nine (32.1%) cases, respectively. Multivariable logistic regression analysis showed that the CCA (adjusted odds ratio (aOR), 2.15 (95% CI, 1.22-3.78); P = 0.008) and nulliparity (aOR, 0.20 (95% CI, 0.06-0.76); P = 0.02) were associated independently with persistent OP position at birth. Moreover, the CCA showed an area under the receiver-operating-characteristics curve of 0.69 (95% CI, 0.56-0.82); P = 0.005) for the prediction of persistent OP position. The optimal cut-off value of the CCA was 36.5°, and was associated with a sensitivity of 0.82 (95% CI, 0.63-0.94), specificity of 0.50 (95% CI, 0.35-0.65), positive predictive value of 0.49 (95% CI, 0.34-0.64), negative predictive value of 0.83 (95% CI, 0.64-0.94), positive likelihood ratio of 1.64 (95% CI, 1.18-2.29) and negative likelihood ratio of 0.36 (95% CI, 0.15-0.83). CONCLUSIONS Our data show that, within a population of women with fetal OP position at the beginning of the second stage of labor, the sonographic fetal head attitude measured by means of the CCA might help in the identification of fetuses at risk of persistent OP position. Such findings can be useful for patient counseling when OP position is diagnosed at full cervical dilatation. Further studies should investigate if the CCA might select patients who may benefit from manual rotation of the fetal head. © 2023 The Authors. Ultrasound in Obstetrics & Gynecology published by John Wiley & Sons Ltd on behalf of International Society of Ultrasound in Obstetrics and Gynecology.
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Affiliation(s)
- R Ramirez Zegarra
- Department of Medicine and Surgery, Obstetrics and Gynecology Unit, University Hospital of Parma, Parma, Italy
| | - A Dall'Asta
- Department of Medicine and Surgery, Obstetrics and Gynecology Unit, University Hospital of Parma, Parma, Italy
| | - E Di Pasquo
- Department of Medicine and Surgery, Obstetrics and Gynecology Unit, University Hospital of Parma, Parma, Italy
| | - G Morganelli
- Department of Medicine and Surgery, Obstetrics and Gynecology Unit, University Hospital of Parma, Parma, Italy
| | - V Falcone
- Department of Medicine and Surgery, Obstetrics and Gynecology Unit, University Hospital of Parma, Parma, Italy
- Department of Obstetrics and Gynecology, Division of Obstetrics and Fetomaternal Medicine, Medical University of Vienna, Vienna, Austria
| | - E Lizarraga Cepeda
- Department of Medicine and Surgery, Obstetrics and Gynecology Unit, University Hospital of Parma, Parma, Italy
- Instituto de Salud Fetal, Hospital Regional Materno Infantil, Tecnologico de Monterrey, Monterrey, Mexico
| | - G Falvo
- Department of Medicine and Surgery, Obstetrics and Gynecology Unit, University Hospital of Parma, Parma, Italy
| | - P Bontempo
- Department of Medicine and Surgery, Obstetrics and Gynecology Unit, University Hospital of Parma, Parma, Italy
| | - A J O Kiener
- Department of Medicine and Surgery, Obstetrics and Gynecology Unit, University Hospital of Parma, Parma, Italy
| | - S Fieni
- Department of Medicine and Surgery, Obstetrics and Gynecology Unit, University Hospital of Parma, Parma, Italy
| | - T Ghi
- Department of Medicine and Surgery, Obstetrics and Gynecology Unit, University Hospital of Parma, Parma, Italy
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Neri S, Di Pasquo E, Corrado NA, Frati F, Dardari M, Mancini M, Pedrazzi G, Ramirez Zegarra R, Ghi T. Correlation between bituberous diameter and mode of delivery in a cohort of low-risk nulliparous women. Eur J Obstet Gynecol Reprod Biol 2023; 287:75-79. [PMID: 37300981 DOI: 10.1016/j.ejogrb.2023.05.023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2023] [Revised: 05/17/2023] [Accepted: 05/18/2023] [Indexed: 06/12/2023]
Abstract
OBJECTIVE The aim our study was to evaluate the association between the antepartum clinical measurement of the Bituberous Diameter (BTD) and the occurrence of unplanned obstetrical intervention (UOI) due to labor dystocia, including either operative vaginal delivery or caesarean section in a cohort of low-risk, nulliparous at term. DESIGN Retrospective analysis of prospectively collected data. SETTING Tertiary maternity care. INTERVENTIONS With the women lying in lithotomic the distance between two ischial tuberosities was assessed using a tape measure during the routine antenatal booking between 37 and 38 weeks of gestation. MEASUREMENTS AND FINDINGS Overall, 116 patient were included, and of these 23(19.8%) were submitted to an UOI due to labor dystocia. Compared to women that had a spontaneous vaginal delivery, women submitted to an UOI had a shorter BTD (8.25 + 0.843 vs 9.60 + 1.12, p < 0.001), a higher frequency of epidural analgesia (21/23 or 91.3% vs 50/93 or 53.8%; p = 0.002) and of augmentation of labor (14/23 or 60.9% vs 19/93 or 20.4%; p < 0.001) as well as a longer first [455 (IQR 142-455 min vs 293 (IQR 142-455) min] and second stages of labor [129 (IQR 85-155) min vs 51 (IQR 27-78) min]. Multivariable logistic regression showed that the BTD (aOR 0.16, 95% CI 0.04-0.60; p = 0.007) and the length of the second stage of labor (aOR 6.83, 95% CI 2.10-22.23; p = 0.001) were independently associated with UOI. When evaluating the diagnostic accuracy of the BTD for the prediction of UOI due to labor dystocia, the BTD showed an AUC of 0.82 (95 %CI 0.73-0.91; p < 0.001) with an optimal cut-off value of 8.6 cm (78.3% (95 %CI 56.3-92.5) sensitivity, 77.4% (95 %CI 67.6-85.4) specificity, 46.2% (95% CI 30.1-62.8) PPV, 93.5% (95% CI 85.5-97.9) NPV, 3.5 (95% CI 2.3-5.4) positive LR, and 0.28 (95% CI 0.13-0.61) negative LR. A significant inverse correlation between the length of the second stage of labour and the BTD in patients that had a vaginal delivery was also demonstrated (Spearman's rho = -0.24, p = 0.01). KEY CONCLUSIONS Our study suggests that antepartum clinical assessment of the BTD might be used as a reliable predictor of UOI due to labor dystocia in low-risk, nulliparous women at term gestation. IMPLICATIONS FOR PRACTICE Antenatal identification of women at higher risk for labor dystocia might trigger some interventions during the second stage of labor, such as maternal position shifting, to increase the pelvic capacity and potentially improve outcomes or might prompt a referral of the patient to a district hospital prior to the onset of labor.
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Affiliation(s)
- S Neri
- Department of Medicine and Surgery, Obstetrics and Gynecology Unit, University of Parma, Parma, Italy
| | - E Di Pasquo
- Department of Medicine and Surgery, Obstetrics and Gynecology Unit, University of Parma, Parma, Italy.
| | - N A Corrado
- Department of Medicine and Surgery, Obstetrics and Gynecology Unit, University of Parma, Parma, Italy
| | - F Frati
- Department of Medicine and Surgery, Obstetrics and Gynecology Unit, University of Parma, Parma, Italy
| | - M Dardari
- Department of Medicine and Surgery, Obstetrics and Gynecology Unit, University of Parma, Parma, Italy
| | - M Mancini
- Faculty of Health, Education and Life Sciences, School of Nursing and Midwifery, Birmingham, UK
| | - G Pedrazzi
- Department of Neuroscience, University of Parma, Parma, Italy
| | - R Ramirez Zegarra
- Department of Medicine and Surgery, Obstetrics and Gynecology Unit, University of Parma, Parma, Italy
| | - T Ghi
- Department of Medicine and Surgery, Obstetrics and Gynecology Unit, University of Parma, Parma, Italy
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