Italian Multicenter Study on Very Low Birth Weight Babies

Area of Science:

• Neonatology
• Epidemiology
• Perinatal Medicine

Background:

• The Italian Multicenter Study on Very Low Birth Weight babies (IMS-VLBW) is the first collaborative study in Italy focusing on newborns under 1500g.
• Eight Neonatal Intensive Care Units (NICUs) participated, with data analyzed by the Istituto Superiore di Sanità.

Purpose of the Study:

• To collect descriptive data on neonatal morbidity, mortality, and long-term outcomes for VLBW infants.
• To analyze risk factors for unfavorable outcomes (death or handicap) and their relationship with neonatal diseases and treatments.
• To assess the feasibility of a multicenter follow-up program using standardized diagnostic criteria.

Main Methods:

• 634 newborns weighing 500-1499g were enrolled in 1987-1988.
• Logistic regression analysis was used to identify significant pre-admission risk factors for in-hospital death.
• A theoretical mortality rate was calculated for each center based on identified risk factors.

Main Results:

• Overall in-hospital mortality was 33.1%, with higher rates in the lower birth weight class (65.1% for 500-999g vs. 19.2% for 1000-1499g).
• High incidences of adverse perinatal conditions (e.g., birth asphyxia, transport issues) and neonatal diseases (e.g., RDS, IVH) were observed.
• Eight significant pre-admission risk factors for mortality were identified: birth weight, gestational age, sex, antenatal steroids, Apgar score, respiration, temperature, and pH on arrival.

Conclusions:

• Observed differences in mortality rates among participating centers were largely explained by pre-admission risk factors, not by variations in care quality.
• The study highlights the critical role of pre-admission factors in VLBW infant outcomes.
• The findings support the feasibility of multicenter follow-up programs for VLBW infants.