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Evaluation of an extension set for intermittent intravenous drug delivery to infants
Insights
This study evaluated a pediatric intravenous administration set for drug delivery accuracy. While generally reliable at slow flow rates, the set showed greater variability compared to other methods in infants.
Area of Science:
- Pharmacology
- Pediatric Drug Delivery
- Intravenous Infusion Technology
Background:
- Accurate drug delivery is critical in pediatric care.
- Existing intravenous administration sets may have limitations for precise dosing in infants.
- Novel administration sets are needed to ensure reliable medication delivery to vulnerable populations.
Purpose of the Study:
- To evaluate the in vitro and in vivo performance of a specialized intravenous administration set for pediatric drug delivery.
- To assess the impact of fluid density and flow rate on drug delivery accuracy using this set.
- To compare the in vivo drug delivery variability of this set against syringe pumps and intravenous push methods in infants.
Main Methods:
- In vitro testing involved radiolabeled gentamicin and penicillin G potassium with varying infusion fluids and flow rates.
- In vivo study utilized a randomized crossover trial in 12 infants comparing the pediatric set with syringe pump and IV push methods for gentamicin delivery.
- Drug concentrations were analyzed using liquid scintillation and enzyme-multiplied immunoassay techniques.
Main Results:
- In vitro drug delivery time was dependent on flow rate, but not significantly affected by drug or fluid density.
- In vivo serum gentamicin concentrations did not differ significantly across the three delivery methods.
- The pediatric extension set exhibited the greatest variability in drug delivery compared to syringe pump and IV push.
Conclusions:
- The pediatric intravenous administration set can provide accurate and reliable drug delivery for volumes of 2-3 mL or less at primary infusion rates below 10 mL/hr.
- Despite overall accuracy, increased variability necessitates careful consideration during clinical use in pediatric patients.
- Further research may be warranted to optimize the design for reduced variability in drug delivery.
Abstract:
An intravenous administration set designed for delivery of drug doses to pediatric patients was tested in vitro for the effect of fluid density and flow rate on drug delivery, and delivery of drug by this extension set was compared in vivo with delivery by other methods. Gentamicin (as the sulfate salt) and penicillin G potassium were used to represent low-density and high-density drugs, respectively; a 1-mL solution of each drug, labeled with carbon 14, was tested with each of two primary infusion solutions: 0.45% sodium chloride injection and 10% dextrose injection. The drug dose was injected via a port into a piston-containing chamber from which an equivalent amount of the primary fluid was displaced. Serial samples collected from the end of the filter-containing extension set were analyzed for drug concentration using a liquid scintillation technique. In 12 infants receiving i.v. gentamicin, this delivery method was compared in a randomized crossover trial with delivery by a syringe pump and by i.v. push. Each delivery system was used on one of three consecutive days, and serum gentamicin concentrations were measured by enzyme-multiplied immunoassay. The time required for in vitro delivery of the dose was dependent on flow rate. Density of the drug solution or the primary i.v. fluid did not significantly affect drug delivery. Serum gentamicin concentrations were not significantly different for the three delivery methods, but variability of drug delivery was greatest with the pediatric extension set. This pediatric extension set provides accurate and reliable drug delivery at primary infusion flow rates slower than 10 mL/hr when the drug dosage volume is 2-3 mL or less.