[Diagnostic value of renal scintigraphy and isotope nephrography, as measured by renal angiography].
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Diagnosis, Differential↗
Biomedical subjects
K J Pfeifer
Publications and source records attributed to K J Pfeifer.
[Isotope renographic studies on the correlation between posture-dependent functional disorders and the degree of nephroptosis].
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Acute Kidney Injury↗
Transcatheter coil embolization of an aneurysm of the pancreatico-duodenal artery with occluded celiac trunk.
We report on a case of a wide-necked aneurysm of the pancreatico-duodenal artery with occlusion of the celiac trunk in an asymptomatic patient. The aneurysm was considered to be at high risk of rupture. Successful embolization after interdisciplinary consultation was followed with color-coded duplex ultrasound (CCDS) demonstrating significant flow reduction. Three weeks later CCDS and angiography demonstrated exclusion of the aneurysm and a patent arterial supply of the liver and spleen fed by superior mesenteric artery (SMA) collaterals. The patient has done well so far, without major adverse clinical events or evidence for tissue necrosis of the liver, pancreas or spleen. Discussion of the case and review of the literature indicate that transcatheter embolization is the therapy of choice even in complicated cases.
Aged↗
Indications, management, and complications of temporary inferior vena cava filters.
PURPOSE: We describe the results of a preliminary prospective study using different recently developed temporary and retrievable inferior vena cava (IVC) filters. METHODS: Fifty temporary IVC filters (Günther, Günther Tulip, Anthéor) were inserted in 47 patients when the required period of protection against pulmonary embolism (PE) was estimated to be less than 2 weeks. The indications were documented deep vein thrombosis (DVT) and temporary contraindications for anticoagulation, a high risk for PE, and PE despite DVT prophylaxis. RESULTS: Filters were removed 1-12 days after placement and nine (18%) had captured thrombi. Complications were one PE during and after removal of a filter, two minor filter migrations, and one IVC thrombosis. CONCLUSION: Temporary filters are effective in trapping clots and protecting against PE, and the complication rate does not exceed that of permanent filters. They are an alternative when protection from PE is required temporarily, and should be considered in patients with a normal life expectancy.
Adult↗
Elastic deformation properties of implanted endobronchial wire stents in benign and malignant bronchial disease: A radiographic in vivo evaluation.
PURPOSE: To evaluate the long-term mechanical behavior in vivo of expandable endobronchial wire stents, we imaged three different prostheses in the treatment of tracheobronchial disease. METHODS: Six patients with bronchial stenoses (three benign, three malignant) underwent insertion of metallic stents. Two self-expandable Wallstents, two balloon-expandable tantalum Strecker stents and two self-expandable nitinol Accuflex stents were used. Measurements of deformation properties were performed during voluntary cough by means of fluoroscopy, at 1 month and 7-10 months after implantation. The procedures were videotaped, their images digitized and the narrowing of stent diameters calculated at intervals of 20 msec. RESULTS: After stent implantation all patients improved with respect to ventilatory function. Radial stent narrowing during cough reached 53% (Wallstent), 59% (tantalum Strecker stent), and 52% (nitinol Accuflex stent) of the relaxed post-implantation diameter. Stent compression was more marked in benign compared with malignant stenoses. In the long term permanent deformation occurred with the tantalum Strecker stents; the other stents were unchanged. CONCLUSION: Endobronchial wire stents can be helpful in the treatment of major airway collapse and obstructing bronchial lesions. However, evidence of material fatigue as a possible effect of exposure to recurrent mechanical stress on the flexible mesh tube may limit their long-term use. This seems to be predominantly important in benign bronchial collapse.
Airway Obstruction↗
Semen parameters and conception rates after surgical treatment and sclerotherapy of varicocele.
Varicocele is an important cause of male subfertility which may lead to varying degrees of pathological semen quality. Removal of varicocele can be an effective andrological treatment if associated with subfertility. Therefore, in a retrospective study, two possible methods of treatment, high ligation and transcatheter sclerotherapy, were compared with regard to semen parameters and conception rates. Three months after treatment, only high ligation showed a significant improvement of sperm concentration, morphology and motility. Sperm concentration and motility, however, similarly increased in both groups after six to nine months. Sclerotherapy showed a better conception rate of 25% than the surgical group with 14%. Sclerotherapy should be the treatment of first choice if associated with subfertility.
Adult↗
Do computers teach better? A media comparison study for case-based teaching in radiology.
A prospective study was performed to better define the role of computers in teaching radiology to medical students. Two hundred twenty-five 3rd-year students were randomly assigned to one of four groups and exposed to 10 radiology cases as well as to a voluntary weekly radiology lecture. Group A used computer-based cases with interactive elements; group B used computer-based cases without interactive elements; group C used paper-based cases with interactive elements; and group D was not exposed to the cases and served as a control group. On a multiple-choice question test, groups A, B, and C showed significant improvement (+11.2%, +15.1%, and +13.0%, respectively), whereas group D did not (+0.6%). On an image interpretation test, group A showed the most improvement (+15.7% [P <.001]), followed by group B (+15.1% [P <.01]) and group C (+10.2% [P <.05]); group D showed no significant improvement (+8.5%). No significant differences in the learning outcome were found between the two interactive groups (computer based and paper based). Computer-based teaching with case studies (with or without interactivity) improves students' problem-solving ability in radiology.
Chi-Square Distribution↗