A Fluid infusion time by syringe size group. In the GLM analysis an interaction was found between syringe size group and bolus number that precluded comment on the impact of bolus number on fluid infusion time. This outcome was intended to determine whether progressive fatigue objectively occurred among providers with repeated fluid bolus administration. A: blue, First 20 mL/kg normal saline bolus; green, Second 20 mL/kg normal saline bolus; red, Third 20 mL/kg normal saline bolus. B Fluid infusion time by bolus number. This figure assists with understanding why the interaction between syringe size and bolus number is occurring. It appears that the 10 mL syringe size group “speeds up” in terms of the time to administer sequential 20 mL/kg fluid boluses while the larger syringe size groups appear to “slow down”. The 10 mL group likely “sped up” because providers became more efficient at rapidly disconnecting and reconnecting syringes. B: blue, 10 mL syringe group; green, 20 mL syringe group; red, 30 mL syringe group; violet, 60 mL syringe group.
Harvey et al. BMC Emergency Medicine 2013 13:14 doi:10.1186/1471-227X-13-14