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Developmental outcome of very low birth weight infants in a developing country
Daynia E Ballot1, Joanne Potterton, Tobias Chirwa
1Department of Paediatrics and Child Health, University of the Witwatersrand, PO Wits 2050, South Africa. daynia.ballot@wits.ac.za
Insights
Neurodevelopmental follow-up of very low birth weight (VLBW) infants in South Africa shows generally normal outcomes, but with a notable proportion at risk. Long-term monitoring is crucial for these vulnerable infants.
Area of Science:
- Neonatalogy
- Developmental Pediatrics
- Public Health
Background:
- Neonatal care advances increase survival of extremely premature infants, who are at risk of handicap.
- Neurodevelopmental follow-up is essential for evaluating neonatal care, especially in resource-limited settings.
- Data from developing countries is crucial for understanding VLBW infant outcomes.
Purpose of the Study:
- To provide neurodevelopmental follow-up data for very low birth weight (VLBW) infants in Johannesburg, South Africa.
- To identify factors associated with poor neurodevelopmental outcomes in this population.
- To inform neonatal care practices in resource-limited settings.
Main Methods:
- Study included VLBW infants discharged from Charlotte Maxeke Johannesburg Academic Hospital (CMJAH).
- Bayley Scales of Infant and Toddler Development (BSID) III assessed development.
- Regression analysis identified factors associated with poor outcomes.
Main Results:
- 106 VLBW infants (mean birth weight 1182g, mean gestational age 30.81 weeks) were assessed using BSID III.
- Mean subscale scores were within the normal range, but approximately one-third scored "at risk" (70-85).
- Cystic periventricular leukomalacia (PVL), resuscitation at birth, and prolonged oxygen were associated with poor outcomes; birth weight and gestational age were not predictive.
Conclusions:
- VLBW infants in this South African cohort showed generally normal neurodevelopmental outcomes with low cerebral palsy incidence.
- Low survival of infants <900g may influence observed outcomes.
- A significant proportion of infants were "at risk," necessitating long-term follow-up into school age.
Background:
Advances in neonatal care allow survival of extremely premature infants, who are at risk of handicap. Neurodevelopmental follow up of these infants is an essential part of ongoing evaluation of neonatal care. The neonatal care in resource limited developing countries is very different to that in first world settings. Follow up data from developing countries is essential; it is not appropriate to extrapolate data from units in developed countries. This study provides follow up data on a population of very low birth weight (VLBW) infants in Johannesburg, South Africa.
Methods:
The study sample included all VLBW infants born between 01/06/2006 and 28/02/2007 and discharged from the neonatal unit at Charlotte Maxeke Johannesburg Academic Hospital (CMJAH). Bayley Scales of Infant and Toddler Development Version 111 (BSID) 111 were done to assess development. Regression analysis was done to determine factors associated with poor outcome.
Results:
178 infants were discharged, 26 were not available for follow up, 9 of the remaining 152 (5.9%) died before an assessment was done; 106 of the remaining 143 (74.1%) had a BSID 111 assessment. These 106 patients form the study sample; mean birth weight and mean gestational age was 1182 grams (SD: 197.78) and 30.81 weeks (SD: 2.67) respectively. The BSID (111) was done at a median age of 16.48 months. The mean cognitive subscale was 88.6 (95% CI: 85.69-91.59), 9 (8.5%) were < 70, mean language subscale was 87.71 (95% CI: 84.85-90.56), 10 (9.4%) < 70, and mean motor subscale was 90.05 (95% CI: 87.0-93.11), 8 (7.6%) < 70. Approximately one third of infants were identified as being at risk (score between 70 and 85) on each subscale. Cerebral palsy was diagnosed in 4 (3.7%) of babies. Factors associated with poor outcome included cystic periventricular leukomalacia (PVL), resuscitation at birth, maternal parity, prolonged hospitalisation and duration of supplemental oxygen. PVL was associated with poor outcome on all three subscales. Birth weight and gestational age were not predictive of neurodevelopmental outcome.
Conclusion:
Although the neurodevelopmental outcome of this group of VLBW infants was within the normal range, with a low incidence of cerebral palsy, these results may reflect the low survival of babies with a birth weight below 900 grams. In addition, mean subscale scores were low and one third of the babies were identified as "at risk", indicating that this group of babies warrants long-term follow up into school going age.
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