Last data update: May 06, 2024. (Total: 46732 publications since 2009)
Records 1-2 (of 2 Records) |
Query Trace: Stevenson JM[original query] |
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Evaluation of non-continuous temperature-monitoring practices for vaccine storage units: a Monte Carlo simulation study
Leidner AJ , Lee CE , Tippins A , Messonnier ML , Stevenson JM . J Public Health (Bangkok) 2020 29 (6) 1253-1260 Objectives: Evaluate different non-continuous temperature-monitoring practices for detection of out-of-range temperatures (above or below the recommended temperature range of 2-8 degreeC for refrigeration units), which are called excursions, within vaccine storage units. Method(s): Simulations based on temperature data collected by 243 digital data loggers operated in vaccine storage units at health-care providers who participated in a CDC-sponsored continuous temperature monitoring pilot project, from 2012 to 2015. In the primary analysis, we evaluate: (1) twice-daily current temperature readings without minimum and maximum readings (min/max), (2) twice-daily current temperature readings with once-daily min/max, and (3) twice-daily current temperature readings with twice-daily min/max. Result(s): Recording current temperature twice daily without min/max resulted in the detection of 4.8-6.4% of the total number of temperature excursions. When min/max readings were introduced, the percentage of detected temperature excursions increased to 27.8-96.6% with once-daily min/max and to 34.8-96.7% with twice-daily min/max. Conclusion(s): Including min/max readings improves the ability of a temperature monitoring practice to detect temperature excursions. No combination of the non-continuous temperature monitoring practices were able to consistently detect all simulated temperature excursions. |
Evaluation of temperature stability among different types and grades of vaccine storage units: Data from continuous temperature monitoring devices
Leidner AJ , Fisun H , Trimble S , Lucas P , Noblit C , Stevenson JM . Vaccine 2020 38 (14) 3008-3014 OBJECTIVE: To evaluate the ability of different types of vaccine storage units to maintain appropriate temperatures for the storage of vaccines and to characterize deviations from recommended temperatures. DATA SOURCES: Continuous temperature monitoring devices, or digital data loggers, from vaccine providers who participated in a continuous temperature monitoring pilot project. STUDY DESIGN: We computed descriptive statistics on the percentage of runtime with an out-of-range temperature, or excursion, for different storage unit types (freezers and refrigerators) and for different storage unit grades (household-grade combination, household-grade stand alone, and purpose-built or pharmaceutical grade). We developed frequency histograms for the percentage of storage unit runtime outside of the normal range. We plotted the duration and temperature extrema for identified excursions. Analyses were stratified by storage unit type and grade. RESULTS: Household-grade combination units underperformed relative to household-grade stand-alone and purpose-built units. Among refrigerators, household-grade combination units operated in the normal temperature range an average of 98.9% of their observed runtime, which was lower than 99.4% (p value = 0.038) for household-grade stand-alone and 99.9% (p value < 0.001) for purpose-built units. Among freezers, household-grade combination units operated in the normal temperature range an average of 95.0% of their observed runtime, which was lower than 99.3% (p value < 0.001) for household-grade stand-alone units and 99.7% (p value < 0.001) for purpose-built units. CONCLUSION: These findings, in particular the underperformance of household-grade combination units relative to household-grade stand-alone and purpose-built units, support current CDC recommendations to avoid the use of household-grade combination storage units when possible. |
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