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KMID : 1131320150170020027
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Journal of Korean Society of Computed Tomographic Technology
2015 Volume.17 No. 2 p.27 ~ p.36
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The usefulness of power injector use according to pressure-linit changes in the Abdomen-pelvis CT
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Park Cheon-Woong
Jung Chul-Hoon
Lee Sook-Hee
Im Heung-Sun
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Abstract
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Purpose : the purpose of this study was to assess the usefulness of power injector use in peripheral IV injections for CT examinations by measuring the injection rate and peak pressure according to pressure-limit changes.
Materials and method : We classified this study into two types. One was an invitro-study and the other was a clinical study. Data collected included prescribed flow rate, measured flow rate, catheter size, pressure-limit and peak pressure. We compared the mean value, prescribed flow rate and measured flow rate in the invitro-study. Furthermore We compared maximum injection rate with a catheter size according to pressure-limit changes and peak pressure under specific states(300psi and 3cc/sec). We prospectively collected data on 1465 patients undergoing abdomen-pelvis CT with IV contrast injection by power injector through a peripheral venous access. Statistical analysis was performed using SPSS software for Windows(version 18.0,SPSS,Inc). One-way anova was used for multiple-analysis of measured flow rate, catheter size and peak pressure. Differences between groups were considered significant when p was less than 0.05.
Results : The maximum injection rate by a catheter size according to pressure-limit changes were measured at 4.6cc/sec with 18G catheter, 4.3cc/sec with 20G catheter, 3.Scc/sec with 22G catheter and 2.7cc/sec with 24G catheter under 300psi. the peak pressure under specific states(300psi and 3cc/sec) were measured at 186psi with 18G catheter, 202psi with 20G catheter, 228psi with 22G catheter and 299psi with 24G catheter. Statistical analysis between prescribed flow rate and measured flow rate was analysed with a paired T-test. P-value was less than 0.05. multiple-analysis of measured flow rate, catheter size and peak pressure were considered significant because p-value was less than 0.05.
Conclusion : the use of power injector through 18-20G IV catheter under 200psi was useful to keep a similar prescribed flow rate. We have to be careful to perform a CT examination with a meticulous technique when a poor IV route was needed for power injection.
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KEYWORD
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power injector, pressure-limit, peak pressure
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