Cup detachment during vacuum-assisted vaginal delivery and birth outcome

Eyal Krispin, Amir Aviram, Lina Salman, Rony Chen, Arnon Wiznitzer, Rinat Gabbay-Benziv*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

15 Scopus citations


Objective: To determine the perinatal outcome associated with cup detachment during vacuum-assisted vaginal delivery (VAVD). Methods: A retrospective cohort study of all women attempting VAVD in a tertiary hospital (2012–2014). Singleton-term pregnancies were included. Antepartum fetal death and major fetal structural or chromosomal abnormalities were excluded. Primary outcome was neonatal birth trauma (subgaleal hematoma, subarachnoid hematoma, subdural hematoma, skull fracture, and/or erb’s palsy). Secondary outcomes were maternal complications or other neonatal morbidities. Outcomes were compared between women after ≥1 cup detachment (study group) and the rest (control group). Logistic regression analysis was utilized to adjust results to potential confounders. Results: Overall, 1779 women attempted VAVD during study period. Of them, in 146 (8.2%), the cup detached prior to delivery; 130/146 (89%) had a single detachment. After detachment, 4 (2.7%) delivered by cesarean section, 77 (52.7%) delivered after cup reapplication, and 65 (44.6%) delivered spontaneously. Women in the study group were more likely to undergo VAVD due to prolonged second stage, and were characterized by lower rates of metal cup use. Neonates in the detachment group had higher rates of subarachnoid hematoma and composite neonatal birth trauma (2.7 vs. 0.1% and 4.8 vs. 1.8%, respectively, p < 0.05). This remained significant after adjustment to potential confounders (subarachnoid hematoma aOR = 45.44, 95% CI 6.42–321.62 and neonatal birth trauma aOR = 2.62, 95% CI 1.1–6.22, p < 0.05 for all). Other neonatal and maternal morbidities were similar between groups. Conclusion: Cup detachment is associated with a higher rate of adverse neonatal outcome. Cup reapplication should be considered carefully.

Original languageEnglish
Pages (from-to)877-883
Number of pages7
JournalArchives of Gynecology and Obstetrics
Issue number5
StatePublished - 1 Nov 2017


  • Birth trauma
  • Cup detachment
  • Subarachnoid hematoma
  • Vacuum-assisted vaginal delivery


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