Does carrier fluid reduce low flow drug infusion error from syringe size?

Area of Science:

• Pediatric Critical Care Medicine
• Pharmacology
• Bioengineering

Background:

• Critically ill neonates and children often require multiple low-flow infusions due to volume limitations and fragile vascular access.
• Simultaneous infusions of concentrated medications are necessary, risking fluid overload if not carefully managed.
• Maintaining precise drug delivery at low flow rates is crucial for patient safety and effective treatment.

Purpose of the Study:

• To evaluate if carrier fluid use affects the variability of low-flow drug infusions in pediatric critical care.
• To determine the relationship between syringe size and infusion variability when using carrier fluid.

Main Methods:

• A low-flow clinical model simulating 0.2 mL/h drug infusion with 5 mL/h carrier fluid was used.
• Infusions were tested using 3-mL, 10-mL, and 60-mL syringes.
• Drug concentrations and total volumes were measured using a graduated volumetric pipette.

Main Results:

• Larger syringes (60-mL and 10-mL) showed less drug concentration in the initial 30 minutes compared to 3-mL syringes.
• Drug overdoses occurred in the initial 45 minutes with 10-mL and 60-mL syringes.
• Subsequent intervals showed greater drug concentrations with smaller syringes (3-mL and 10-mL) compared to 60-mL syringes.

Conclusions:

• Using carrier fluid with larger syringes in low-flow infusions resulted in less drug delivery and increased flow problems.
• Carrier fluid should not be used to compensate for the use of inappropriately large syringes in critical pediatric infusions.
• Precise control of low-flow infusions requires careful selection of syringe size and avoidance of carrier fluid for compensation.