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131.
132.
粉防己碱对犬心浦氏纤维慢内向电流的作用 总被引:2,自引:0,他引:2
应用双微电极电压钳技术,观察粉防己碱(Tet) 对犬心脏浦氏纤维细胞的慢内向电流Isi的影响,发现Tet对Isi的峰值有明显减弱作用。Tet的这种效应呈剂量及时间依赖性。当Tet浓度为30μmol/L和100μmol/L,给药后10min时,Isi的峰值分别由给药前的47.9±5.6 nA和38.4±21.5nA降至21±7.8nA和6.3±7.7nA,P值均小于0.01。Tet100μmol/L对由二价阳离子Sr2+所介导的Isi亦有明显的抑制作用。结果提示Tet是一慢通道阻滞剂。 相似文献
133.
Background Elective radiation of lower neck is controversial for nasopharyngeal carcinoma (NPC) without lymph node metastasis (N0 disease).Tumor volume is an important prognostic indicator.The objectiv... 相似文献
134.
Dorfman GS; Cronan JJ; Paolella LP; Lambiase RE; Haas RA; Scola FH; Schepps B 《Radiology》1989,173(1):159-162
To determine the prevalence of iatrogenic abnormalities associated with percutaneous delivery of Greenfield filters, the authors prospectively evaluated 69 peripheral veins used for filter placement in 68 patients. Of the 69 venotomy sites, 63 were not associated with preexisting thrombosis and were evaluated with compression and Doppler ultrasound within 1 week of placement and over 13-541 days. New thrombosis developed at the puncture site in nine of 63 sites (14.3%), although clinical suspicion of clot was raised in only one patient. Fifty-four sites (85.7%) showed no evidence of acute deep venous thrombosis, even though three patients had signs and symptoms suggestive of thrombosis. During the follow-up, most new thromboses resolved, yielding a 96.3% long-term patency rate. The authors conclude that postplacement increase in symptoms of venous stasis and occlusion may not correlate with placement site thrombosis. New filters should be evaluated for their ability to capture potential pulmonary emboli while maintaining caval patency and for mechanical and biologic stability because placement site complications occur at low rates and resolve in most cases. 相似文献
135.
136.
Blastomycosis of the lung: CT features 总被引:1,自引:0,他引:1
137.
Synovial plicae of the knee 总被引:2,自引:0,他引:2
Deutsch AL; Resnick D; Dalinka MK; Gilula L; Danzig L; Guerra J Jr; Dunn FH 《Radiology》1981,141(3):627
138.
Ultrasound (US) is often employed as a screening test for hydronephrosis in the nondiverted kidney and has been used recently to evaluate the diverted kidney, specifically ileal loops, for obstruction. The utility of US in evaluating obstruction in patients with ileal loops has apparently not been previously explored. During a 2-year period, 87 kidneys drained by an ileal loop diversion were examined with US because of clinical indications of possible renal obstruction. In 33 kidneys, no hydronephrosis was seen on sonograms, and no obstruction was later proved; in 51 kidneys, shown by US to be hydronephrotic, only 19 (37%) were obstructed. Three left kidneys were not visualized with US. The percentage of hydronephrotic kidneys subsequently shown to be obstructed increased rapidly as the US appearance progressed from grade 1 (20%) to grade 3 (80%). In this series, US had a 100% sensitivity and a 50% specificity in evaluating patients with ileal loops for renal obstruction. Thus, for the adult patient, a direct contrast evaluation of the collecting system is suggested; for the pediatric patient, initial use of US is justified as a means to avoid radiation exposure. 相似文献
139.
Vertebral hemangiomas: MR imaging 总被引:6,自引:0,他引:6
Vertebral hemangiomas, unlike most bone lesions, show increased signal on T1- and T2-weighted magnetic resonance (MR) images. To define the basis for these signal characteristics, a retrospective review was done of the MR imaging findings in ten vertebral hemangiomas (eight patients), and these were correlated with the findings from plain radiographic, computed tomographic (CT), and histopathologic studies. MR images showed mottled increased signal in T1- and T2-weighted images from the osseous portions of the tumors. In three patients, the extraosseous components failed to show increased signal on T1-weighted images. Chemical shift images and histologic studies demonstrated that adipose tissue caused the increased signal on T1-weighted images. The extraosseous components of the tumor contained little, if any, adipose tissue, which explained the lack of high-intensity signal on T1-weighted images. These signal changes appear to make a specific constellation of findings for the diagnosis of vertebral hemangioma with MR imaging. 相似文献
140.
Pancreatic transplants: evaluation with MR imaging 总被引:3,自引:0,他引:3