Fig. 3From: The effect of different methods of intravenous injection on glass particle contamination from ampulesBox plot of number of glass particles per ampule by group. Group 1 Bolus IV after immediate aspiration. Group 2 Bolus IV after 2 min’ delayed aspiration. Group 3 Bolus IV after aspiration with a filter needle syringe. Group 4 Side shooting to an infusion set with an in-line filterBack to article page