ABSTRACT
Objective To study the value of parameters of Transit-Time Flow Measurement(TTFM) as predictor and judge for one-year after coronary artery bypass transplantation in patency rate of vessel grafts .Methods Parameters of quantity of blood flow and the value of PI( pulsation index) were measured and recorded by intraoperative TTFM in CABG .One-year of follow-ing up, coronary artery CT or coronary angiography examination were accomplished.Results Our study include artery grafts 46(including LIMA grafts 44, RIMA graft 1 and radial artery graft 1) with the patency rate of grafts 91.3％ for one-year after CABG, and vein grafts 48 with the patency rate of grafts 66.7％ .There exists statistically significant difference between above two groups(P<0.001).High PI is independent risk factor(P =0.037) in patency rate of vessel grafts for one-year after CABG by binary logistics regression analysis but no other parameters have the statistical significance (P>0.05) .The results from logistic regression were summarized using the area under the ROC curve(AUC) .The pulsation index has been found hav-ing moderate judgment ability(P=0.016) for the dysfunction of grafts after CABG for one-year with optimal cut-off value of 2. 45.Conclusion Intraoperative high value of PI is the independent risk factor in patency rate of vessel grafts for one-year after CABG.
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Objective To explore the effects of heart rate changes after holding breath and time for recovering stable heart rate on the quality of coronary CTA.Methods Totally 700 patients undergoing coronary CTA examination in some hospital were enrolled into the study,whose data on initial heart rate at rest condition,maximal heart rate during breath holding,stable heart rate after breath holding as well as the time consumed for recovering stable heart rate were collected and analyzed.Results A heart rate trendgram was drawn to find out the rules for heart rate changes and time for recovering stable heart rate,so that proper retrospective or prospective scanning scheme could be determined.Conclusion Mastering the rules in heart rate changes and time for recovering stable heart rate contributes to guiding coronary CTA.
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Objective To explore coronary CT three-dimensional post-processing standardized display and the construction of digital teaching platform. Methods The conventional display positions of 3D post-processing image were summarized during daily coronary CTA examination, the common place was refined. The construction mode was explored for CTA digital teaching demonstration platform. Results Coronary CTA 3D post-processing standardized display with common and individual property contributed to enhancing the display of coronary images. The CTA digital teaching demonstration platform met the teaching requirements. Conclusion The coronary CT 3D post-processing standardized display and digital teaching platform facilitate the student to master related knowledge.
ABSTRACT
Objective To quantitate coronary tortuosity and provide favorable conditions for understanding the hemodynamic effects caused by coronary tortuosity.Methods We obtained all images from 72 patients who received coronary computed tomo-graphy scanning.After image post-processing,we extracted the medial axis of three main coronary vessel and analysed its coordi-nates on three dimensions.Then we calculated the tortuosity coefficient of coronary artery.Results Tortuosity coefficient was 6.66±7.54 in anterior descending,13.43±12.85 in left circumflex,and 1 7.61 ±7.67 in right coronary artery.We had proved its validity by the changes in morphology with simulated shapes.Conclusion We proposed a new method for quantitating coronary tor-tuosity,by computed tomography coronary imaging.The measurement results would not be affected by projection plane,vessel length or other artificial factors.