Survival of extremely premature babies in a geographically defined population: prospective cohort study of 1994-9 compared with 2000-5.
OBJECTIVE
To assess changes in survival for infants born before 26 completed weeks of gestation.


METHODS
Prospective cohort study in a geographically defined population.


METHODS
Former Trent health region of the United Kingdom.


METHODS
All infants born at 22+0 to 25+6 weeks' gestation to mothers living in the region. Terminations were excluded but all other births of babies alive at the onset of labour or the delivery process were included.


METHODS
Outcome for all infants was categorised as stillbirth, death without admission to neonatal intensive care, death before discharge from neonatal intensive care, and survival to discharge home in two time periods: 1994-9 and 2000-5 inclusive.


RESULTS
The proportion of infants dying in delivery rooms was similar in the two periods, but a significant improvement was seen in the number of infants surviving to discharge (P<0.001). Of 497 infants admitted to neonatal intensive care in 2000-5, 236 (47%) survived to discharge compared with 174/490 (36%) in 1994. These changes were attributable to substantial improvements in the survival of infants born at 24 and 25 weeks. During the 12 years of the study none of the 150 infants born at 22 weeks' gestation survived. Of the infants born at 23 weeks who were admitted to intensive care, there was no significant improvement in survival to discharge in 2000-5 (12/65 (18%) in 2000-5 v 15/81 (19%) in 1994-9).


CONCLUSIONS
Survival of infants born at 24 and 25 weeks of gestation has significantly increased. Although over half the cohort of infants born at 23 weeks was admitted to neonatal intensive care, there was no improvement in survival at this gestation. Care for infants born at 22 weeks remained unsuccessful.
Field
David J
DJ
Department of Health Sciences, University of Leicester, UK. david.field@uhl-tr.nhs.uk
Dorling
Jon S
JS
Manktelow
Bradley N
BN
Draper
Elizabeth S
ES
D000022:Abortion, Spontaneous / Q000401:mortality; D004739:England / Q000453:epidemiology; D004812:Epidemiologic Methods; D005865:Gestational Age; D006801:Humans; D007226:Infant Mortality; D007231:Infant, Newborn; D007234:Infant, Premature; D015931:Intensive Care, Neonatal / Q000706:statistics & numerical data; D050497:Stillbirth / Q000453:epidemiology