Attitudes to viability of preterm infants and their effect on figures for perinatal mortality.

OBJECTIVE

To examine how local attitudes to management of extreme preterm labour can influence data on perinatal mortality.

DESIGN

One year prospective study in a geographically defined population.

SETTING

The 17 perinatal units of Trent region.

PATIENTS

All preterm infants of less than or equal to 32 weeks' gestation in the Trent region.

INTERVENTIONS

Infants who had been considered viable at birth were referred for intensive care; those who had been considered non-viable received terminal care.

MAIN OUTCOME MEASURES

Whether each infant was born alive, dead, or alive but considered non-viable.

RESULTS

Large differences were observed among units in the rates of delivery of infants of less than or equal to 27 weeks' gestation (rates varied from 7.2 to 0 per 1000 births). These differences were not present in the data relating to infants of between 28 and 32 weeks' gestation. The variation seemed to result from different approaches to the management of extreme preterm labour--that is, whether management took place in a labour ward or a gynaecology ward.

CONCLUSIONS

Place of delivery of premature babies (less than or equal to 27 weeks' gestation) may influence classification and hence figures for perinatal mortality. In addition, the fact that the onus of judgment regarding viability and classification is often placed on relatively junior staff might also affect the figures for perinatal mortality. The introduction of a standard recording system for all infants greater than 500 g would be advantageous.