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Accurate determination of cast weight for neonates with clubfoot
C Stephan1, J E Herzenberg, F F Araujo
1Maryland Center for Limb Lengthening and Reconstruction, University of Maryland School of Medicine, Baltimore 21207, USA.
Insights
Accurately estimate neonate weight with casts on. Plaster casts gain weight, while synthetic ones lose weight, impacting drug and fluid calculations for infants.
Area of Science:
- Biomedical Engineering
- Neonatal Care
- Orthopedics
Background:
- Accurate infant weight is crucial for drug and fluid dosage calculations.
- Casts applied to neonates can affect accurate weight measurements.
- Understanding cast weight changes is essential for precise neonatal care.
Purpose of the Study:
- To quantify cast weight changes in neonates within 48 hours of application.
- To compare weight variations across different cast materials.
- To enable accurate estimation of neonate true weight without cast removal.
Main Methods:
- Five distinct cast materials were evaluated.
- Cast weight was measured before, immediately after, and at 48-hour intervals post-application.
- Weight changes were analyzed to determine the final dry weight relative to initial wet weight.
Main Results:
- Plaster casts averaged 107.5% of their final dry weight.
- Synthetic casts averaged 99% of their final dry weight.
- Significant weight discrepancies were noted for plaster casts, particularly for very low birth weight infants.
Conclusions:
- Cast weight changes, especially with plaster of Paris, can significantly impact dosage calculations.
- This study provides data to estimate neonate weight accurately, even with casts applied.
- The findings support non-invasive weight estimation in neonatal intensive care settings.
Abstract:
The purpose of this study was to determine changes in cast weight during the first 48 hours after application so that the true weight of a neonate can be estimated without the need for removing the cast. Five types of cast materials were compared. Cast weight measurements were obtained before and after application and at intervals during 48 hours. Final cast weight averaged 107.5% of dry weight for plaster and 99% of dry weight for synthetic cast materials. For very low birth weight infants, the difference between the initial wet weight of plaster of Paris and its final dry weight may be significant for calculating drug and fluid dosages. The weight of an infant can now be calculated without the necessity of cast removal.