Enhanced accuracy in gravity-based intravenous infusion using pulse oximeter drop counting and measured single-drop...

Area of Science:

• Medical Devices
• Biomedical Engineering
• Clinical Engineering

Background:

• Intravenous (IV) fluid therapy is critical but suffers from high error rates due to human factors.
• Gravity-based IV systems are error-prone, while electronic pumps present limitations in size, cost, and complexity.
• Accurate IV fluid delivery is essential for patient safety and treatment efficacy.

Purpose of the Study:

• To evaluate the impact of single-drop weight measurement and real-time light source monitoring on gravity-based infusion system accuracy.
• To compare the accuracy of a novel monitoring method against standard manufacturer's data and IV infusion flow regulators.
• To identify methods for improving the precision of IV fluid delivery systems.

Main Methods:

• Tested gravity-based IV sets from three manufacturers using 1,000 ml of 0.9% saline.
• Recorded drops per minute and drop weight using a pulse oximeter as a light source.
• Analyzed mean absolute percentage error (MAPE) and correlations between residual volume and drop rate, comparing pulse oximeter (PO) group to control (C) and IV infusion flow regulator (IIFR) groups.

Main Results:

• The pulse oximeter (PO) group demonstrated statistically higher accuracy and lower MAPE compared to control (C) and IV infusion flow regulator (IIFR) groups (P < 0.05).
• Accuracy was improved across most flow rates, with the PO group being closer to actual measurements.
• A strong correlation (r > 0.9) was observed between residual volume and drop rate.

Conclusions:

• Real-time drop measurements using light sources and single-drop weight assessment enhance the accuracy of gravity-based IV infusion systems.
• Integrating pulse oximeters into IV sets offers a promising approach to improve clinical precision.
• This technology has the potential to reduce medical provider workload and minimize infusion errors.