Postpartum x-ray pelvimetry: Its use in calculating the fetal-pelvic index and predicting fetal-pelvic disproportion

Karen O'Brien, Martha Rode, George Macones

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

OBJECTIVE: To determine whether postpartum x-ray pelvimetry can be used to calculate the fetal-pelvic index (FPI) in future pregnancies. STUDY DESIGN: In stage I of the study, 10 gravid women, after 36 completed weeks' gestation, underwent x-ray pelvimetry before delivery. Pelvimetry was repeated within two days alter delivery. Comparisons between antepartum and postpartum measurements were made using paired t tests and correlation coefficients. In stage II, 25 gravid women, after 36 completed weeks' gestation, underwent fetal ultrasound for biometry. X-ray pelvimetry was performed within two days after delivery. FPI was calculated for each pregnancy using antepartum fetal ultrasound and postpartum pelvimetry measurements. FPI calculations were correlated with the incidence of fetal-pelvic disproportion (FPD), as indicated by the requirement for cesarean section for arrest of active labor. Sensitivity, specificity and predictive value of FPI were assessed. RESULTS: In stage I, mean anteroposterior and transverse diameters of the pelvic inlet, midpelvis and pelvic outlet did not differ significantly. In stage II, the sensitivity of FPI for detecting FPD was 100%, specificity 95%, positive predictive value 80%, and negative predictive value 100%. CONCLUSION: Postpartum pelvimetry has the same association with FPD as antepartum pelvimetry. The strategy of using postpartum pelvimetry and antepartum fetal biometry to calculate FPI successfully identified 100% of the patients who ultimately required cesarean section for FPD, with a false positive rate of 5%. Pelvimetry performed postpartum in an index pregnancy may be used in future pregnancies, in combination with antepartum fetal ultrasound, to calculate FPI and predict the likelihood of FPD.

Original languageEnglish
Pages (from-to)845-848
Number of pages4
JournalJournal of Reproductive Medicine for the Obstetrician and Gynecologist
Volume47
Issue number10
StatePublished - Oct 1 2002

Keywords

  • Cephalopelvic disproportion
  • Fetal-pelvic index
  • Pelvimetry
  • Vaginal birth after cesarean

Fingerprint

Dive into the research topics of 'Postpartum x-ray pelvimetry: Its use in calculating the fetal-pelvic index and predicting fetal-pelvic disproportion'. Together they form a unique fingerprint.

Cite this