We describe a case of takotsubo cardiomyopathy with ventricular fibrillation after gastroenterological endoscopy in a 66-year-old woman. Ten minutes after the upper and lower gastrointestinal endoscopic examinations, the patient lost consciousness, went into respiratory arrest, and became cyanotic; an electrocardiogram (ECG) showed ventricular fibrillation. Electrical defibrillation was applied three times resulting in the patient's recovery. Subsequently, the ECG showed ST elevation in V2-V3; ultrasound cardiography showed a severely hyperkinetic base of the left ventricle, with the rest of the ventricle akinetic; and cardiac catheterization disclosed a normal coronary artery and normal contraction of the left ventricle.
Fatigue life of smooth specimens is approximately controlled by the growth life of a small crack. This means the growth behavior of small cracks must be clarified to estimate the fatigue life of plain members. However, there are few studies on the growth behavior of small cracks in ultrafine grained (UFG) metals. In the present study, fatigue tests for UFG copper have been conducted. The formation behavior of shear bands (SBs) and growth behavior of a small crack have been monitored to clarify the effect of SBs on the growth behavior of a major crack.
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