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https://www.selleckchem.com/ Objective To investigate the role of dual-layer detector energy spectral CT in resting myocardial perfusion imaging for patients with normal coronary artery. Methods One hundred and fifty-six patients with suspected coronary heart disease underwent dual-layer detector energy spectral CT coronary angiography,and resting myocardial perfusion imaging was performed for 28 patients with normal coronary artery.According to American Heart Association's 17-segmentmodel,the iodine density and effective atomic number(Zeff value)of each myocardial segment(except for apical segment)were measured and normalized to those of the aorta.All the data were quantitatively evaluated using ANOVA or Friedman test. Results Iodine density and Zeff value of myocardial segments in middle plane were significantly different(all P 0.05). Conclusions Iodine density and Zeff value of myocardial segments can be quantitatively evaluated using dual-layer detector energy spectral CT.Resting myocardial perfusion of segments in middle plane are significantly different in patients with normal coronary artery.Objective To analyze clinical characteristics and short-term efficacy of endoscopic hemostasis in acute duodenal hemorrhage. Methods A retrospective study was conducted for the patients who received endoscopy in the PUMC Hospital due to upper gastrointestinal bleeding and were confirmed to be on account of duodenal lesions for bleeding from January 2011 to December 2018.Clinical information of patients was collected,including demographics,comorbidities,and medication use.Endoscopic information included the origin of bleeding,the number and location of lesions,Forrest classes and size of ulcers,and endoscopic therapeutic methods.Factors that could be relative to the failure of endoscopic hemostasis or short-term recurrence of hemorrhage in these patients were analyzed. Results Among all the patients with duodenal hemorrhage,79.7%(102/128)were due to ulcers,14.1%(18/128)to

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