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The effect of different manipulation techniques on the accuracy and reproducibility of small dose volume I.V. measurements Rhian Isaac
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The effect of different manipulation techniques on the accuracy and reproducibility of small dose volume IV measurements Rhian Isaac Birmingham Children’s Hospital Aston University
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Why? Unexpected effects/ levels ‘Purple oral syringes’ NPSA alert 20 risk assessment – SOP – Increasing risk score CHIP trial ‘Premmies’
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Small dose volumes
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Aims Determine methods used on PICU Repeat in laboratory to determine – Accuarcy – Reproducibility
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PICU nurses asked – “how would you prepare 2.5units insulin in 50ml” – “how would you prepare 5 units insulin in 50ml” Methods described simulated 10 times each
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Method A 1.Volume withdrawn using filter needle 2.Excess in syringe expelled 3.Needle changed, 4.Transferred to 50ml syringe made to volume. Method B 1.Volume withdrawn using filter needle 2.Needle changed 3.Excess in syringe expelled 4.Transferred to 50ml syringe made to volume.
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Method C 1.0.5ml drawn into syringe via filter needle 2.Transferred to 5ml syringe 3.Made up to 5ml 4.Needle changed 5.Dose required transferred to 50ml syringe Method D 1.0.5ml drawn into syringe via filter needle 2.Transferred to 5ml syringe 3.Made up to 5ml 4.Needle changed 5.Needle primed 6.Dose required transferred to 50ml syringe
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Results for 2.5units Method AMethod BMethod CMethod D Average02.71.82.4 Max03.12.92.7 Min00.20.62.1 Std dev0+/- 0.26+/- 0.74+/- 0.17 C of V09.6340.777.1
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Results for 5units Method AMethod BMethod CMethod D Average05.233.505.58 Max05.55.46.1 Min05.02.05.2 Std dev0+/- 0.01+/- 0.98+/-0-28 C of V02.6827.75
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Conclusion Small study Repeat – Larger numbers – Variable personnel – Validated personnel Variable end dosing Protocols need to be detailed What is cut off small dose volume?
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