Related Experiment Videos
Factors affecting delivery of high-efficiency dialysis using temporary vascular access
J Kelber1, J A Delmez, D W Windus
1Renal Division, Washington University School of Medicine, St. Louis, MO 63110.
Summary
Hemodialysis effectiveness relies on blood flow and minimal recirculation. This study found that double-lumen catheters maintain adequate blood flow rates across various sites and high flow rates, despite pressure changes.
Area of Science:
- Nephrology
- Vascular Access
- Medical Devices
Background:
- Hemodialysis effectiveness is influenced by prescribed blood flow rate and blood recirculation.
- Limited data exists on recirculation in double-lumen catheters at high blood flow rates (≥300 mL/min).
Purpose of the Study:
- To evaluate the impact of prescribed blood flow rate and catheter placement site on measured blood flow, recirculation, and effective clearance using double-lumen catheters.
Main Methods:
- Seventeen patients underwent recirculation studies using double-lumen catheters placed in the internal jugular, subclavian, and femoral veins.
- Studies were conducted at blood flow rates of 250, 300, 350, and 400 mL/min using a two-needle method.
- Blood flow was measured with an ultrasonic flow meter, and arterial line pressure was continuously monitored.
Main Results:
- Measured blood flow rates increased appropriately with prescribed flow rates across all catheter sites.
- Arterial line pressure varied with prescribed blood flow rates and catheter length, particularly in the 24-cm femoral catheter.
- Despite pressure fluctuations, effective blood flow delivery was maintained.
Conclusions:
- Double-lumen catheters can achieve prescribed blood flow rates at higher settings (up to 400 mL/min) across different venous access sites.
- Catheter placement and prescribed flow influence arterial line pressure, but do not impede adequate blood flow delivery.
- These findings support the use of double-lumen catheters for effective hemodialysis at high blood flow rates.