Most patients diagnosed with takotsubo cardiomyopathies are expected to almost completely recover, and their prognosis is excellent. However, complications can occur in the acute phase. We present a case of a woman with takotsubo cardiomyopathy with right ventricular involvement who developed a rupture of the right ventricular free wall following ventricular septal rupture, as a consequence of an acute increase in right ventricular afterload by left-to-right shunt. Our case report illustrates that takotsubo cardiomyopathy can be life threatening in the acute phase. Ventricular septal rupture in biventricular takotsubo cardiomyopathy may be a harbinger of cardiac tamponade by right ventricular rupture.
The high cycle fatigue properties of two kinds of wrought Al 2519 alloys without and with scandium of 0.10% were investigated. The fatigue strength was determined at R = 0.1 under constant amplitude loading conditions in air. The alloy with scandium of 0.10% showed a little lower tensile yield strength and higher fatigue strength values. The fine grained Al-0.10Sc alloy exhibited a higher resistance against fatigue crack nucleation despite the lower yield stress in comparison to the coarse
grained Al 2519 alloy. The results can be explained mainly with the microstructural differences between both alloys. This results are due to the presence of coherent Al3 (Sc, Zr) precipitates and a very fine subgrain structure.
Conventionally embrittlement of components for petrochemical equipment has been determined by small punch (SP) testing, which involves carrying out mechanical testing of specimens sampled from practical structures to estimate the integrity and residual life of the equipment. The application range of SP testing has been expanded to cryogenic environments, and attempts have recently been made to expand it further to high-pressure hydrogen environments. To examine the effect of hydrogen on pipeline materials before SP testing, the amount of hydrogen permeation was measured under several testing conditions. The test specimens were prepared as follow. First, after obtaining a section (10 mm in width, 10 mm in height, and 0.7 mm in thickness) from a steel pipe made of X70, X65, or X42 as the base metal by wire cut electric discharge processing. Subsequently, grinding both surfaces, the test specimen was finished to maximum surface roughness of less than 6 μm, with a final thickness of 0.5 ± 0.005 mm. The aim of this study was to determine whether sensitivity to hydrogen could be measured by SP testing; hence, the test was conducted at a punch speed of 4 × 10−3 mm/min, which is much slower than the 0.2 ∼ 2 mm/min adopted for conventional SP testing, like CWA 15627. The maximum load measured for all three steels under 10 MPa was not influenced by machine type (servo hydrodynamic or electromechanical), holding time after charging hydrogen, or bolt fastening torque. Different means for correcting SP curves depending on the stiffness of the testing machines were suggested, and their effectiveness throughout testing was demonstrated.
May-Thurner syndrome iliac vein compression syndrome is an uncommon condition in which the right common iliac artery compresses the left common iliac vein against the pelvic rim, resulting in left iliofemoral deep vein thrombosis and severe leg edema. Serious vascular sequelae to the leg can result if this condition is not recognized and corrected in a timely fashion. Several new interventions for treating May-Thurner syndrome have emerged over the past several years. Catheter-directed thrombolysis and stenting have been advocated as effective for the treatment of acute thrombosis and the underlying stenosis of May-Thurner syndrome. We report two cases of May-Thurner syndrome that were treated with catheter-directed thrombolysis and stent im- 서 론
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