The Accuracy and Variability of Bolus Injections With Different Sized Syringes

Can J Anaesth. 1992 Feb;39(2):198-201. doi: 10.1007/BF03008656.

Abstract

The accuracy of bolus injections using different sized syringes was studied. A 1 ml bolus was delivered from a 1 ml, 5 ml, 10 ml, and a 20 ml syringe (n = 205). The 1 ml syringe was the most accurate (P less than 0.001) and the bolus delivered was the least variable (P less than 0.001). Variability increased as syringe size increased. A 3 ml bolus was delivered from a 3 ml, 5 ml, 10 ml, and a 20 ml syringe (n = 164). The 5 ml syringe was the most accurate (P less than 0.05) and the 3 ml and 5 ml syringes delivered a bolus with the least variability (P less than 0.001). A 5 ml bolus was delivered from a 5 ml, 10 ml, and a 20 ml syringe (n = 123); in this case there was no significant difference in the accuracy or variability of bolus among the three syringes. We conclude that for accuracy of small volume boluses (less than 5 ml), small-sized syringes should be used.

MeSH terms

  • Analysis of Variance
  • Anesthesia, Intravenous / instrumentation*
  • Calibration
  • Equipment Design
  • Injections, Intravenous / instrumentation
  • Materials Testing
  • Syringes*