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目的观察冠状动脉CT成像(CCTA)中,根据冠状动脉钙化(CAC)近端与远端冠状动脉管腔CT值及校正后冠状动脉强化值(CCO)差值评估钙化部位管腔狭窄的准确度。方法对CCTA显示钙化的233支主要冠状动脉(左前降支、左回旋支和右冠状动脉),根据狭窄程度分为轻度狭窄组、中度狭窄组、重度狭窄组和完全闭塞组,比较各组CCO差值,分析以钙化近远端CCO差值评估冠状动脉狭窄的准确度。结果完全闭塞组CCO差值高于轻度狭窄组、中度狭窄组和重度狭窄组(P<0.001);重度狭窄组与中度狭窄组CCO差值差异无统计学意义(P>0.05);中度狭窄组和重度狭窄组CCO差值高于轻度狭窄组(P<0.001)。以钙化近远侧CCO差值0.0869作为诊断界点,其诊断冠状动脉≥50%狭窄的敏感度、特异度、阳性预测值和阴性预测值分别为76.67%、75.47%、91.39%和48.78%;以0.2070作为诊断界点时,其诊断冠状动脉闭塞的敏感度、特异度、阳性预测值和阴性预测值分别为91.84%、79.89%、54.88%和97.35%。结论冠状动脉钙化近远端管腔CCO差值随狭窄程度加重而升高,以之作为评价指标,可明显提高评估冠状动脉钙化及狭窄程度的准确性。  相似文献   
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Inbred mouse strains are the most widely used mammalian model organism in biomedical research owing to ease of genetic manipulation and short lifespan; however, each inbred strain possesses a unique repertoire of deleterious homozygous alleles that can make a specific strain more susceptible to a particular disease. In the current study, we report dystrophic cardiac calcinosis (DCC) in C.B‐17 SCID male mice at 10 weeks of age with no significant change in cardiac function. Acquisition of DCC was characterized by myocardial injury, fibrosis, calcification, and necrosis of the tissue. At 10 weeks of age, 38% of the C.B‐17 SCID mice from two different commercial colonies exhibited significant calcinosis on the ventricular epicardium, predominantly on the right ventricle. The frequency of calcinosis was more than 50% for mice obtained from Taconic's Cambridge City colony and 25% for mice obtained from Taconic's German Town colony. Interestingly, the DCC phenotype did not affect cardiac function at 10 weeks of age. No differences in echocardiography or electrocardiography were observed between the calcinotic and non‐calcinotic mice from either colony. Our findings suggest that C.B‐17 SCID mice exhibit DCC as early as 10 weeks of age with no significant impact on cardiac function. This strain of mice should be cautiously considered for the study of cardiac physiology.  相似文献   
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This report describes unusual autopsy findings in a 44-year-old woman who had a large, calcified patent ductus arteriosus that produced substantial left-to-right shunting. The patient died in 1962, 7 days after patch closure of the aortic orifice of the ductus. Numerous calcific deposits were present in the mural left atrial endocardium, the mitral valve leaflets and annulus, and the aortic valve cusps. The cause of the left-sided calcific deposits was perhaps related to the patient''s several-decades-old giant aortopulmonary shunt, causing a major increase in the volume of blood passing through the left-sided cardiac chambers in comparison with the volume in the right side. To our knowledge, such findings in a patient with patent ductus arteriosus have not been reported previously.  相似文献   
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Systemic sclerosis (SSc) is an uncommon connective tissue disease of childhood. Moreover, pediatric SSc positive for anticentromere antibodies (ACA) is extremely rare. We describe two cases of ACA‐positive SSc in Japanese girls with clinical findings. Case 1 is a 15‐year‐old female. From disease onset at 7 years, she developed limited cutaneous (no internal involvement) SSc positive for ACA and anti‐U1RNP antibodies, but negative for antitopoisomerase I antibodies (ATA). She also showed calcinosis, sclerodactyly, and telangiectasia, but not Raynaud's phenomenon. Case 2 is also a 15‐year‐old female with onset at the same age. Her diagnosis was limited cutaneous SSc positive for ACA, anti‐SSA/Ro antibodies, and anti‐thyroid antibodies, but not ATA. She showed sclerodactyly, telangiectasia, and Raynaud phenomenon, as well as complicated Sjögren's syndrome and chronic thyroiditis with euthyroidism. We reported that two Japanese girls with SSc were positive for ACA and other antibodies with the exception of ATA.  相似文献   
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Calcinosis cutis is the deposition of insoluble calcium in the cutaneous tissue. Calcinosis cutis can be classified as metastatic, dystrophic, idiopathic or exogenous. We report a 48‐year‐old white man who was dismantling a portable ice skating rink when calcium chloride solution from the pipes spilt onto his clothing. Several days later, he started to develop mildly pruritic erythematous papules, some studded with white deposits and some with umbilication over the exposed areas corresponding to the spillage of the calcium chloride solution. Histological features revealed interstitial fibrohistiocytic reaction with calcium‐encrusted degenerated collagen bundles in the dermis which was further confirmed by von Kossa stain. He was commenced on topical corticosteroid cream twice daily and the lesions cleared completely between 6 to 10 weeks.  相似文献   
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