Historical notes on immaturity. Part 2: surviving against the odds.

Area of Science:

• Neonatalogy
• Medical Ethics
• Perinatology

Background:

• Historical accounts of exceptionally intelligent survivors born prematurely, such as Fortunio Liceti (1577) and Isaac Newton (1643), highlight early instances of survival against odds.
• Reliable medical documentation of premature infant survival emerged around 1820, with numerous cases of infants born under 1000g before World War II developing normally.

Observation:

• Significant decline in the birth weight threshold for infant survival, from 2200g in 1876 to 600g by 2006, indicating substantial advancements in neonatal care.
• Variability in statistical reporting due to differing international definitions of abortion, stillbirth, and live birth, impacting accurate data collection.
• The World Health Organization (WHO) 1993 definition (500g or 22 weeks gestation) for infant registration was not universally adopted, leading to underreporting of extremely premature births.

Findings:

• Ethical recommendations for the treatment of immature infants vary, with 'optional treatment windows' differing by country (e.g., 22-23 weeks in Japan/Germany, 23-24 weeks in UK/USA/Canada, 24-26 weeks in France/Netherlands/Switzerland).
• Current guidelines often prioritize gestational age over individual infant prognosis, disregarding factors like gender, comorbidities, and the specific cause of premature delivery when deciding on life support.

Implications:

• The reliance on gestational age alone for treatment decisions may not reflect an individual infant's potential for survival or long-term outcomes.
• Need for standardized international definitions and ethical frameworks for managing extremely premature infants to ensure consistent care and accurate data.
• Future research should focus on personalized prognostication for extremely premature infants, integrating all relevant clinical factors beyond gestational age.