Extremely premature infants: shifting limits to survival and wellbeing
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Nash Keen of Iowa, born at 21 weeks gestation and weighing 285 grams, holds a Guinness World Record for prematurity, reflecting a changing understanding of infant viability.
In recent years, the threshold for potential survival has moved to 22 weeks, but doctors now emphasize that gestational age isn’t the sole determining factor. They consider fetal weight, growth, maternal health, and the quality of available neonatal care.
Gemma Arca, a neonatologist at Hospital Clínic de Barcelona, explains that in specialized medical systems, 22 weeks is now the lower limit where survival-focused care can be considered in selected cases. Guidelines from the British Association of Perinatal Medicine recommend decisions between 22 and 26 weeks shouldn’t rely solely on gestational age, and discourage active treatment before 22 weeks.
Factors like the baby’s sex, with girls showing slightly better outcomes, and interventions like antenatal corticosteroids and specialized care significantly influence survival rates. However, Arca and colleagues highlight a lack of a national data system in Spain to track care for 22-week infants. This hinders evaluating clinical practices, comparing centers, and developing consistent protocols. They argue for a prospective, comprehensive registry that records gestational age, maternal characteristics, treatments administered, and long-term neurodevelopmental outcomes, not just survival rates.
Recent Swedish data shows improved survival for extremely premature infants hasn’t translated to a similar reduction in neurodevelopmental issues, with around half of survivors born at 22-23 weeks exhibiting moderate to severe developmental challenges by age two or three. The focus, Arca insists, should be on ensuring survival isn’t achieved at the cost of significant disability and poor quality of life.
