Invest Radiol. 2018 Jan;53(1):1-5. doi: 10.1097/RLI.0000000000000403.
The aim of this study was to compare flow rates over time and the deviations from the target flow rate of a magnetic resonance imaging contrast agent achieved by an automated injector versus manual injection.
In this laboratory study, the magnetic resonance contrast agent gadobutrol was repeatedly injected by an injector and by 10 experienced technologists. Six scenarios with 2 different target flow rates (1 and 5 mL/s), 2 different contrast volumes (10 and 20 mL), and 2 different intravenous (IV) catheters (22 gauge and 20 gauge) were tested. The flow rates over time were recorded. The target variable was the average absolute deviation and average absolute percentage deviation from the target flow rate.
The flow rates over time achieved by an injector were almost identical. Slight deviations from the target flow rate occurred during ramp-up and ramp-down only. Those of manual injection showed high variability over the whole course of the injection. In the 1 mL/s scenarios, the injector deviated from the target flow rate by 0.06 mL/s or less (≤6%) and in the 5 mL/s scenarios by 1.02 mL/s or less (<20%). For the manual injections at the same flow rates, these figures were 0.35 mL/s or less (≤35%) and 3.1 mL/s or less (≤62%).
Injector administration of a magnetic resonance contrast agent minimally deviated from the target flow rate, whereas manual injection varied widely. Injector administration is more accurate and repeatable.
本研究旨在比较自动注射器和手动注射实现磁共振造影剂目标流速的时间内流速和流速偏差。
在这项实验室研究中，反复通过注射器和 10 名有经验的技师对磁共振造影剂钆布醇进行注射。测试了 6 种情况，具有 2 种不同的目标流速（1 和 5 mL/s）、2 种不同的对比剂体积（10 和 20 mL）和 2 种不同的静脉（IV）导管（22 号和 20 号）。记录了随时间变化的流速。目标变量是平均绝对偏差和平均绝对百分比偏差从目标流速。
注射器随时间的流速几乎完全相同。仅在斜坡上升和斜坡下降期间发生对目标流速的轻微偏差。手动注射的偏差在整个注射过程中表现出高度的可变性。在 1 mL/s 情况下，注射器的流速偏差小于 0.06 mL/s（≤6%），在 5 mL/s 情况下，流速偏差小于 1.02 mL/s（<20%）。在相同流速下，手动注射的偏差为 0.35 mL/s 或更小（≤35%）和 3.1 mL/s 或更小（≤62%）。
磁共振造影剂的注射器给药最小程度地偏离目标流速，而手动注射则变化很大。注射器给药更准确且可重复。
