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Can caretakers of children with IDDM accurately measure small insulin doses and dose changes?
S R Silva1, L Clark, S N Goodman
1Johns Hopkins University School of Medicine, Baltimore, MD 21287-3311, USA.
Insights
Caretakers of children with insulin-dependent diabetes mellitus (IDDM) struggle to accurately measure small insulin doses, often over-administering by an average of 0.22 units. While consistent with specific doses, they can detect 0.25 unit changes, but errors persist.
Area of Science:
- Pediatrics
- Endocrinology
- Diabetes Management
Background:
- Accurate insulin dosing is critical for managing insulin-dependent diabetes mellitus (IDDM).
- Young children with IDDM require precise, small incremental doses of insulin.
- Previous research has not fully elucidated the accuracy of caretakers in measuring these small insulin doses.
Purpose of the Study:
- To evaluate the accuracy and consistency of caretakers in measuring small, incremental doses of U-100 insulin for children with IDDM.
- To identify potential biases in insulin dose measurement by caretakers.
Main Methods:
- Fifteen caretakers of children with IDDM participated in the study.
- Participants administered repeated small insulin doses, including increments of 0.25 U.
- A gravimetric technique assessed measurement errors, with statistical analysis evaluating accuracy and consistency.
Main Results:
- Caretakers consistently over-administered insulin, with an average error of 0.22 U.
- Significant differences in delivered doses were observed even with 0.25 U variations.
- Measurement error did not significantly vary with the intended dose level.
Conclusions:
- Caretakers demonstrate inaccuracies in measuring small insulin doses, leading to consistent over-administration.
- Despite inaccuracies, caretakers show reasonable internal consistency and can detect statistically significant small dose changes.
- When multiple individuals manage insulin for a child with IDDM, dose variability increases by approximately 40%.
Objective:
To determine if caretakers of young children with IDDM could consistently reproduce small incremental measurements of insulin (U100).
Research Design And Methods:
Fifteen caretakers of children with IDDM were asked to deliver repeated small doses of insulin, including doses separated by only 0.25 U of insulin. A sensitive gravimetric technique was used to determine the error in measurement of these low doses of insulin. Statistical analysis was used to evaluate accuracy and internal consistency of each caretaker at each dose.
Results:
The means +/- SD at each dose level were as follows: 2.75 +/- 0.13 U at 2.5 U, 3.19 +/- 0.13 U at 3.0 U, 3.55 +/- 0.13 U at 3.25 U, and 3.70 +/- 0.11 U at 3.5 U. All doses were biased toward overadministration. There was as statistically significant difference in the dose delivered when the target doses were varied by only 0.25 U. The average differences and standard errors between 2.5 U and 3.0 U, 3.0 U and 3.25 U, and 3.25 U and 3.5 U were 0.44 +/- 0.20 U, 0.36 +/- 0.018 U, and 0.15 +/- 0.017 U, respectively.
Conclusions:
Participants were not accurate in measuring small insulin doses, consistently overdrawing insulin by an average of 0.22 U. Caretakers are reasonably internally consistent with a given dose, since participants were able to measure statistically significant differences in 0.25 U dose changes. The error in insulin measurement does not vary with the intended dose level. Caretakers in the same family deliver insulin doses as variable from each other as they are from the population as a whole; however, when two or more individuals are responsible for one insulin dose in a child with IDDM, they have a combined variability that is approximately 40% greater than a single individual's variability.