상행대동맥의 조영증강시간에 영향을 주는 인자 관한 연구

The Relationships between the parameters(Heart Rate, Ejection Fraction and BMI) and the maximum enhancement time of ascending aorta

Purpose In this study, because the time which is reached at aorta through antecubital vein after injecting contrast media is different from each person, I used Bolus Tracking method to investigate the parameters affecting the time when contrast media is reached at 100HU(T100) and studied the relationship between parameters and T100. Materials and Methods Using 64MDCT, Cadiac CT, I got the data from July and September, 2007. 100patients (male : 50, female : 50, age distribution : 21-81, average age : 57.5) were performed by injecting the contrast media at 4ml/sec through their antecubital vein except having difficulties in stopping their breath and having arrhythmia. I used Somatom Sensation Cardiac 64, Siemens and measured patients’ height and weight to know their mean Heart rate and BMI. I measured Ejection Fraction using Argus Program, Wizard Workstation. I analyzed variances of each parameter depending on T100’s variation with multiple comparison and analyzed the correlation of Heart rate, Ejection Fraction and BMI. Results According to T100’s variation caused by Heart rate, Ejection Fraction and BMI variations, the higher patients’ Heart Rate and Ejection Fraction were, the faster T100’s variations caused by Heart Rate and Ejection Fraction were. The lower their Heart Rate and Ejection Fraction were, the slower T100’s variations were, but T100’s variations caused by BMI were not affected. In the correlation between T100 and parameters, Heart Rate (p <0.01) and Ejection Fraction (p<0.05) were significant, but BMI was not significant (p>0.05). In the Heart Rate, Ejection Fraction and BMI depending on Fast (17sec and less), Medium (18 - 21 sec), Slow(22sec and over) Heart Rate was significant at Fast and Slow and Ejection Fraction was significant Fast and Slow as well as Medium and Slow (p<0.05). but BMI was not statistically significant. Conclusion Of the parameters (Heart Rate, Ejection Fraction and BMI) which would affect T100, Heart Rate was the most significant and the higher Heart Rate and Ejection Fraction were, the faster T100 was.