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Summary
Summary
A retrospective study was carried out in the Maternity Hospital of Cruces (Vizcaya, Spain) over 11 years (1980–1990). Twin deliveries numbered 744 and their relative frequency was 1 in 101 deliveries. Although the total number of deliveries declined sharply during the years of study, there was an increase in the overall incidence of multiple births.
The use of caesarean section for twin delivery increased during the study (P < 0·05). In the first 6 years 23·1 per cent of deliveries were by caesarean section increasing to 33·9 per cent in the last 5 years.
We failed to find a unique cause for these differences, but a number of factors correlated with the increase in the caesarean section rate. The increase in the incidence of a non-cephalic first twin, the decline in internal version and breech extraction of a second transverse lie twin and the rise in prematurity rates were all associated with the increase in abdominal delivery of twins.