Instrumental rotational delivery in primiparae.

We analysed 98 consecutive instrumental rotational deliveries of babies weighing > 2,500 grams in primiparae. Our aim was to compare the use of Kjelland's forceps with vacuum delivery with regard to efficacy and safety. The vaginal delivery rate was similar with Kjelland's forceps (96%) and vacuum (90%). The vacuum cup failed to effect rotation in 14% and 77% required forceps delivery after vacuum rotation. The vacuum took longer to effect delivery (P < 0.01). Women delivered with Kjelland's forceps had higher pain scores in the puerperium. There were no perinatal deaths. Low Apgar scores and cord arterial pH values of less than 7.20 were recorded more frequently after vacuum rotation (p < 0.05). Babies delivered with Kjelland's forceps sustained more physical trauma. The incidence of asphyxial encephalopathy was the same in both groups. We would recommend a more selective approach to the use of both rotational vacuum and Kjelland's forceps in primiparae.