ABSTRACT
Objective To investigate the express of collagen fibers ,NCAM11 and RUNX1 in blood-supply myocardium of myo-cardial bridge(MB) .Methods The Massion′s staining were conducted to reveal the morphology of collagen fibers in blood-supply myocardium among MB without artherosclerosis(group A) ,MB with artherosclerosis(group B) ,coronary artery disease(group C) , and non-cardiogenic instantly death(group D) .The expression level of NCAM1 and RUNX1 were detected among four groups using immunohistochemistry(IHC) and Western bolt ,respectively .Results There were a lot of collagen fibers in myocardium interstitial substance and/or heart muscle necrosis between group B and C ,but not almost collagen fibers between group A and D .The expres-sion of NCAM1 was positive in group B ,and mainly expressed on the cytoplasm and membranes of cardiac myocytes by IHC .group C was similar to results in vicinal myocardium with myocardial scar .However ,there was quite lowness or negative expression of NCAM1 in group A and D .Significant difference was found between group B as well as C and group A as well as D (P<0 .05) .The expression level of RUNX1 in blood-supply myocardium was almost like to the results of NCAM 1 .Conclusion MB with arthero-sclerosis might be lead to chronic myocardial ischemia .
ABSTRACT
PURPOSE: To compare the accuracy with which electron beam tomography (EBT) and 99m Tc-MIBI scanning measure myocardial perfusion valve. MATERIALS AND METHODS: Twenty-two subjects [normal volunteers (n = 6), patients in whom ischemic heart disease was diagnosed (n = 5), and those in whom ischemic heart disease was suspected but who were found to be normal (n = 11)] were involved in this study. EBT was performed after bolus injection of contrast media (50 ml of Iopamiro 370 or Optiray 350, 3 ml/sec). The myocardium was divided into 16 segments according to the classification devised by the American Society of Echocardiography, and each myocardial perfusion value was calculated by post-image processing. A pharmacologic stress test was performed in all subjects except four patients with acute myocardial infarction, and myocardial perfusion reserve ratios were assessed. Single photon emission computed tomography (SPECT) was performed after the injection of 20 mCi of 99m Tc-MIBI. Any segments with moderate to severe photon defect on visual analysis of SPECT were identified and perfusion values determined by EBT in normal and ischemic segments were compared. RESULTS: No difference in myocardial perfusion was found between volunteers and the suspected group. Their perfusion values were 0.71 +/-0.14 ml/g/min in the resting state and 1.16 +/-0.24 ml/g/min on the stress test and the myocardial perfusion reserve ratio was, therefore, 1:1.68 +/-0.38. In ischemic patients, 99m Tc-MIBI scanning revealed a perfusion defect in 28 segments, and on EBT the measurement obtained was 0.54 +/-0.19 ml/g/min. The remaining 324 perfusion segments shown by SPECT to be normal showed a perfusion value of 0.79 +/-0.22 ml/g/min on EBT. CONCLUSION: Compared with 99mTc-MIBI scanning, the measurement of myocardial perfusion by EBT provides absolute quantification of perfusion value and more detailed anatomic information.