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"Raw" Formula for Calculating Maintenance Fluid Volumes in Low Birth-Weight and Premature Babies Derived


Nwate Ledisi

Abstract

Background: Fluid management of low birth weight and preterm babies can be challenging, as the determination of maintenance fluid volumes have to be calculated to suit the demands of this delicate neonates in order to avoid fluid over-load or dehydration. It is on this background that this study to derive an easy to use formula for calculating maintenance fluid volumes in this category of babies was embarked upon, utilizing existing Tables.

Method: One of the most developed Tables on this subject matter, the 'Paediatric Surgical Unit Guidelines, Sheffield Children's Hospital' was selected, re-ordered, subjected to analysis, factorization and simplification; in order to derive the formula. To validate its accuracy the Table was re-constructed using the derived Formula. The derived Table was then compared with the original table. The paired sample T- test, using variation in days and in weights, did not show any statistically significant (p<0.05) difference between the two Tables

Results: From the Table the formula, 20{(R+A)-W}, ml kg-1 day-1 was derived. This translates to 20(R+A-W) ml kg-1 day-1 or O.8 (R+A-W)mlkg-1 Hr-1. Where: R =Rehydration factor (ranging mostly from 3 to 5), A = the age (in days) of the baby, W =premature baby's actual weight. These three letters constitute the acronym, RAW.

Conclusion: It is recommended that "'RAW" Formula be used in Calculating Maintenance Fluid Volumes in Low Birth-Weight and Premature Babies. This is because its accuracy is validated; having compared and noted that there is no statistically significant difference between the tables constructed from it with the original PSU Sheffield Table.

Keywords: RAW Formula; Maintenance Fluid Volume; Premature; Low Birth Weight Babies


Journal Identifiers


eISSN: 2992-345X
print ISSN: 0189-9287