<prompt> Stunning of myocardium without any acute coronary syndrome is:-Subendocardial infarctionRestrictive cardiomyopathyTakotsubo cardiomyopathyTransmural infarction  <response>: Ak as broken hea syndrome High degree of emotional stress Increase catecholamines Coronary aery vasospasm Ischemic dilatedcardiomyopathy ME: Acute stage a necrosis contraction band necrosis - Histologically, acute cases may show microscopic areas of necrosis characterized by myocyte hypercontraction contraction band necrosis; subacute and chronic cases may exhibit microscopic foci of granulation tissue andor scar. - Elevated levels of catechols also increase hea rate and myocardial contractility, exacerbating ischemia caused by the vasospasm. The outcome of such vasospasm can be sudden cardiac death usually caused by a fatal arrhythmia or an ischemic dilated cardiomyopathy, so-called takotsubo 