A Simple, Standard Method to Characterize Pressure/Flow Performance of Vascular Access Cannulas

作者：Paulsen Michael J^*; Orizondo Ryan; Le Duy; Rojas Pena Alvaro; Bartlett Robert H

来源：ASAIO Journal, 2013, 59(1): 24-29.

DOI：10.1097/MAT.0b013e3182746401

• cannula selection
• extracorporeal support (ECS)
• pressure flow
• UM number

Vascular access cannulas for extracorporeal life support are characterized by French (Fr) size alone, which affords limited information on pressure (P) and flow (Q) performance, making their selection difficult. Previously, we developed an accurate metric of cannula performance, the M number, but its complexity and the need of a nomogram hindered its utility. We propose adoption of an easier and clinically useful metric to assess cannula performance: Q at 100 mm Hg P, the updated M number, or the "UM number." A circuit was created using a centrifugal pump, Tygon tubing, and a reservoir. A total of 74 cannulas (arterial, venous, and double lumen) ranging from 6 to 50 Fr size were studied. Glycerol solution with a viscosity of 3 cP was used to mimic blood. A Biopac system and ultrasonic flow probe was used to collect P/Q data across a cannula's performance range. The UM number describes the pressure-flow characteristics of any given cannula. It can be used to select access cannulas based on performance and to determine if flow matches expected flow during use. ASAIO Journal 2013;59:24-29

• 出版日期2013-2