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Neurological development in very-low-birthweight infants. Application of a standardized examination and Prechtl's
Insights
Very-low-birthweight (VLBW) infants show developmental delays at 3 months, but many improve by 6 months. Neurological assessments and head circumference monitoring are crucial for tracking VLBW infant development.
Area of Science:
- Neonatal Neurology
- Developmental Pediatrics
- Perinatal Medicine
Background:
- Modern neonatal intensive care has reduced morbidity in very-low-birthweight (VLBW) infants.
- Assessing long-term neurodevelopmental outcomes in VLBW infants remains critical.
Purpose of the Study:
- To evaluate the neurodevelopmental outcomes of VLBW infants using a standardized neurological examination based on Prechtl's optimality concept.
- To compare VLBW infants with and without perinatal complications and with full-term controls.
Main Methods:
- A standardized neurological examination using Prechtl's optimality concept was administered to VLBW infants (n=98) and full-term controls (n=29) at 3 and 6 months corrected age.
- Infants were categorized by birth weight (AGA, SGA) and perinatal risk.
- Head circumference and Bayley scores were used for complementary assessments at 12 months.
Main Results:
- All VLBW infants had significantly lower optimality scores than controls at 3 months corrected age.
- Intrauterine growth retardation and perinatal cerebral distress were associated with lower scores.
- Two-thirds of VLBW infants showed developmental delay/neurological deficit at 3 months, with significant catch-up observed by 6 months (70% normal scores).
- Head circumference growth velocity is a key indicator for predicting severe developmental delay.
Conclusions:
- VLBW infants demonstrate a potential for neurodevelopmental catch-up between 3 and 6 months corrected age.
- Early neurological assessment, head circumference tracking, and psychomotor development scores are vital for comprehensive VLBW infant assessment.
- Perinatal complications and intrauterine growth restriction significantly impact early neurodevelopmental trajectories in VLBW infants.
Abstract:
Modern methods of newborn intensive care have greatly improved long-term morbidity rates of very-low-birthweight (VLBW) infants. Our standardized neurological examination was applied to 3- and 6-month-old infants and expressed as a score by using Prechtl's optimality concept. Among 98 VLBW infants, 56 were at high risk because of perinatal complications with possible cerebral distress and 42 had no complications. The VLBW infants were also divided into AGA (61) and SGA (37) babies. In addition, 29 full-term infants were enrolled as controls. A statistical analysis of the optimality scores revealed that all VLBW infants had significantly lower mean scores at the corrected age of 3 months than the full-term controls. Intrauterine growth retardation and perinatal cerebral distress clearly depress the optimality scores. At 6 months only infants with high perinatal risk had considerably lower scores than the age controls. Two-thirds of all VLBW infants were found to have a developmental delay and/or a neurological deficit at the corrected age of 3 months. At age 6 months, however, a marked catch-up and/or self-repair had occurred, as was documented by about 70% of normal optimality scores. Head circumference measurements over the first year of life can be an important assisting factor in developmental assessments. If a microcephalic infant does not show higher than normal head growth velocity a severe developmental delay or neurological deficit must be expected. At 12 months the Bayley scores of psychomotor development have served to complement the preceding neurological and head growth findings.