Study population
In total, 3606 labouring women who had fetal scalp sampling were primary
included (Helsingborg Hospital N=523, Kristianstad Hospitals N=183,
Ystad N=330, Skåne university Hospital N=1718, Östra Sahlgrenska
University Hospital N=368, Söder University Hospital N=116, and Westmead
Hospital, Sydney, Australia N=96). From these, 272 were excluded due to
missing SSLX values, leaving 3334 for analysis. In the whole cohort
48.8% were delivered by spontaneous vaginal delivery.
For fetal distress 16.1% were
delivered by instrumental vaginal delivery and 18.5% by caesarean
section. Of those with a pathological LP value >4.8mmol/L,
64% were in second stage of labour. Among all, and among those
delivered within 25 minutes from FBS to delivery, the frequency of MA
was 4.8% and 3.7% and for five minutes Apgar Score <7 the
frequency was 2.6% and 2.8%, respectively.
Table 1 presents maternal and neonatal characteristics. The results are
presented in two cohorts depending on the time interval between FBS to
delivery. For most of the parameters there were significant differences
between the two cohorts, though for MA, low AS and need for neonatal
intervention, the differences were not significant.