PMID- 34341745 OWN - NLM STAT- PubMed-not-MEDLINE LR - 20220425 IS - 2223-4292 (Print) IS - 2223-4306 (Electronic) IS - 2223-4306 (Linking) VI - 11 IP - 8 DP - 2021 Aug TI - Quantitative analysis of renal blood flow during thoracic endovascular aortic repair in type B aortic dissection using syngo iFlow. PG - 3726-3734 LID - 10.21037/qims-20-992 [doi] AB - BACKGROUND: Currently, the thoracic endovascular aortic repair is the recommended clinical treatment for type B aortic dissections. Unfortunately, malperfusion or ischemia of the kidneys is a major complication of type B aortic dissections. Despite this, few studies have focused on the effects of thoracic endovascular aortic repair on blood flow in renal arteries and parenchyma. This current investigation used novel real-time imaging software to quantitatively analyze the hemodynamic changes in renal artery blood flow and perfusion before and after stent graft placement. METHODS: A total of 51 patients with type B aortic dissection undergoing thoracic endovascular aortic repair between April 2017 and September 2019 were retrospectively recruited. The pre-and post-procedural digital subtraction angiography images were converted into color-coded maps using syngo iFlow for quantitative comparison. Time-intensity curves and related parameters, including the average peak ratio (avg.Pr), average delayed time to peak (avg.dTTP), and average area under the curve ratio (avg.AUCr) of the renal arteries and renal cortex were obtained and analyzed. Wilcoxon signed-rank test was used to compare iFlow parameters before and after endovascular repair. Spearman correlation analyses were performed to study iFlow parameters and renal function parameters and the estimated glomerular filtration rate (eGFR) and blood urea nitrogen (BUN). RESULTS: A total of 102 images including 51 pre-operative and 51 post-operative image datasets were successfully post-processed. Following endovascular repair, syngo iFlow showed a significant 33.0% increase in avg.Pr (P<0.001) and a significant 35.1% increase in avg.AUCr (P<0.001) in the renal artery. Additionally, there was a significant 12.2% decrease in the avg.dTTP (P=0.001), a significant 24.5% increase in avg.Pr (P=0.004), and a significant 38.3% increase in avg.AUCr (P=0.009) in the renal cortex. Spearman correlation analysis showed that after endovascular repair there was a significant correlation between the avg.Pr of the renal artery and eGFR (r=0.30; P=0.0349), the avg.Pr of the renal cortex and eGFR (r=0.30; P=0.0300), and the avg. AUCr of the renal cortex and BUN (r=0.31; P=0.0289). CONCLUSIONS: syngo iFlow provided a novel quantitative method for evaluating renal hemodynamic changes in patients with type B aortic dissection undergoing endovascular treatment. Time-intensity curve parameters may facilitate the intraprocedural evaluation of renal blood flow and perfusion to complement the color-coded map. CI - 2021 Quantitative Imaging in Medicine and Surgery. All rights reserved. FAU - Fang, Kun AU - Fang K AD - State Key Laboratory of Cardiovascular Disease, Center of Vascular Surgery, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China. FAU - Zhao, Jiawei AU - Zhao J AD - State Key Laboratory of Cardiovascular Disease, Center of Vascular Surgery, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China. FAU - Luo, Mingyao AU - Luo M AD - State Key Laboratory of Cardiovascular Disease, Center of Vascular Surgery, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China. FAU - Xue, Yunfei AU - Xue Y AD - State Key Laboratory of Cardiovascular Disease, Center of Vascular Surgery, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China. FAU - Wang, Hui AU - Wang H AD - Department of Vascular Surgery, The Second Xiangya Hospital of Central South University, Changsha, Hunan, China. FAU - Ye, Luming AU - Ye L AD - Department of Advanced Therapy, Siemens Healthineers, Beijing, China. FAU - Zhang, Xuelan AU - Zhang X AD - School of Mathematics and Physics, University of Science and Technology Beijing, Beijing, China. FAU - Zheng, Liancun AU - Zheng L AD - School of Mathematics and Physics, University of Science and Technology Beijing, Beijing, China. FAU - Shu, Chang AU - Shu C AD - State Key Laboratory of Cardiovascular Disease, Center of Vascular Surgery, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China. AD - Department of Vascular Surgery, The Second Xiangya Hospital of Central South University, Changsha, Hunan, China. LA - eng PT - Journal Article PL - China TA - Quant Imaging Med Surg JT - Quantitative imaging in medicine and surgery JID - 101577942 PMC - PMC8245938 OTO - NOTNLM OT - Thoracic endovascular aortic repair (TEVAR) OT - renal blood flow OT - renal parenchymal perfusion OT - syngo iFlow OT - type B aortic dissection (TBAD) COIS- Conflicts of Interest: All authors have completed the ICMJE uniform disclosure form (available at http://dx.doi.org/10.21037/qims-20-992). The authors have no conflicts of interest to declare. EDAT- 2021/08/04 06:00 MHDA- 2021/08/04 06:01 PMCR- 2021/08/01 CRDT- 2021/08/03 06:40 PHST- 2020/08/30 00:00 [received] PHST- 2021/04/09 00:00 [accepted] PHST- 2021/08/03 06:40 [entrez] PHST- 2021/08/04 06:00 [pubmed] PHST- 2021/08/04 06:01 [medline] PHST- 2021/08/01 00:00 [pmc-release] AID - qims-11-08-3726 [pii] AID - 10.21037/qims-20-992 [doi] PST - ppublish SO - Quant Imaging Med Surg. 2021 Aug;11(8):3726-3734. doi: 10.21037/qims-20-992.