Related Experiment Video
Updated: Mar 22, 2026

Modeling Ascending Vaginal Infection, Preterm Birth, and Neonatal Morbidity in Mice
Published on: October 10, 2025
Thirteen-year mortality and morbidity in preterm infants in Switzerland
Fei Chen1, Nadia M Bajwa2, Peter C Rimensberger3
1Division of Neonatology and Paediatric Intensive Care, Children's University Hospital of Geneva and University of Geneva, Geneva, Switzerland Department of Child Health-Care, Shanghai Children's Hospital, Shanghai Jiaotong University, Shanghai, China.
Insights
Survival rates for very preterm infants in Switzerland improved from 2000-2012, with decreased delivery room and neonatal mortality. However, major complications like bronchopulmonary dysplasia remained a challenge.
Area of Science:
- Neonatalogy
- Pediatric Critical Care
- Public Health
Background:
- Very preterm infants (gestational age <32 weeks) face significant mortality and morbidity risks.
- Population-based data on outcomes for this vulnerable group are crucial for improving care.
Purpose of the Study:
- To analyze trends in mortality and major morbidities for very preterm infants in Switzerland over a 13-year period.
- To stratify outcomes by gestational age and identify changes over time.
Main Methods:
- Prospective, observational study of 8899 preterm infants (GA <32 weeks) in Switzerland (2000-2012).
- Data collected through the Swiss Neonatal Network, covering all level III NICUs.
- Assessed trends in mortality, survival free of major complications, and morbidities including BPD, IVH 3-4, NEC, and cPVL.
Main Results:
- Overall survival rate was 84.4%, with significant reductions in overall mortality (18.4% to 13.8%) and NICU mortality (12.6% to 8.2%).
- Incidence of severe intraventricular hemorrhage (IVH 3-4) decreased, but bronchopulmonary dysplasia (BPD), necrotizing enterocolitis (NEC), and cystic periventricular leukomalacia (cPVL) remained stable.
- Survival free of major complications improved from 66.7% to 72.4%.
Conclusions:
- Survival rates for very preterm infants have improved, driven by reduced mortality, particularly in extremely preterm infants.
- While severe IVH rates declined, persistent challenges exist with BPD, NEC, and cPVL, necessitating continued research and improved interventions.
Objective:
To report the population-based, gestational age (GA)-stratified mortality and morbidity for very preterm infants over 13 years in Switzerland.
Design:
A prospective, observational study including 95% of Swiss preterm infants (GA <32 weeks) during three time periods: 2000-2004 (P1), 2005-2008 (P2) and 2009-2012 (P3).
Setting:
The Swiss Neonatal Network, covering all level III neonatal intensive care units (NICUs) and affiliated paediatric hospitals.
Patients:
8899 live-born preterm infants with GA <32 weeks.
Main Outcome Measures:
Trends in GA-specific mortality (overall, delivery room and NICU), 'survival free of major complications' and major short-term morbidities: bronchopulmonary dysplasia (BPD, oxygen requirement at 36 weeks), grades 3 and 4 intraventricular haemorrhage (IVH 3-4), necrotising enterocolitis (NEC) and cystic periventricular leukomalacia (cPVL).
Results:
Survival rate was 84.4%; 5.7% died in the delivery room and 9.9% died in the NICU. Neonatal mortality was 8.6% and post-neonatal mortality in NICU admissions was 1.3%. Reductions were observed in overall mortality from 18.4% (95% CI 17.0% to 19.8%) in P1 to 13.8% (13% to 15%) in P3, NICU mortality from 12.6% (11.4% to 13.8%) to 8.2% (7.2% to 9.2%) and IVH 3-4 from 7.8% (6.8% to 8.7%) to 5.8% (4.9% to 6.6%). There was no change in the incidence of cPVL and NEC. The BPD (oxygen requirement at 36 weeks) incidence displayed a U-shaped distribution across the three time periods. Overall, 71.0% (70.0% to 72.0%) had 'survival free of major complications' at the time of hospital discharge, and this significantly improved from 66.7% (65.0% to 68.4%) to 72.4% (70.8% to 74.0%) between P1 and P3.
Conclusions:
Survival rates of very preterm infants increased with decreasing delivery room and neonatal mortalities, mostly in extremely preterm infants. The incidence of IVH 3-4 decreased, whereas the incidences of cPVL, NEC and BPD (oxygen requirement at 36 weeks) remained largely unchanged from 2000 to 2012 in Switzerland.
More Related Videos
11:50Clinical Practice Protocol of Creative Music Therapy for Preterm Infants and Their Parents in the Neonatal Intensive Care Unit
Published on: January 7, 2020
07:36Modeling Encephalopathy of Prematurity Using Prenatal Hypoxia-ischemia with Intra-amniotic Lipopolysaccharide in Rats
Published on: November 20, 2015