Using corticosteroid is mainstay of therapy

to decrease the inflammatory process. Though there are no randomized trial, high dose corticosteroid therapy seemed to be effective in RGFP966 patients with LV ejection fraction was between 30 to 55%.88) Corticosteroid use was associated with improvement in about 87% of patients.89) Carbon monoxide intoxication Transient LV systolic dysfunction occurs in about 50% of patients with carbon monoxide poisoning,90) probably due to tissue hypoxia caused by left-ward shift of the oxygen-hemoglobin dissociation curve as well as an inflammatory reaction.90) In addition to diffuse hypokinesia and LV systolic dysfunction with regional wall motion Inhibitors,research,lifescience,medical abnormalities, an apical ballooning pattern of LV systolic dysfunction can occur. LV systolic dysfunction Inhibitors,research,lifescience,medical is and generally normalizes with conventional treatment within 3 days.91) Carbon monoxide poisoning can also result in myocardial fibrosis (detectable with DHE by CMR). This finding can occur even in the setting of normal LV function.92) Inhibitors,research,lifescience,medical Cocaine intoxication Cocaine intoxication can cause an acute, reversible cardiomyopathy,93) predominantly through production of a profoundly enhanced sympathomimetic state similar to catecholamine-induced

cardiomyopathy. Mid-wall DHE has also been described, due to myocardial infarction secondary to cocaine related vasoconstriction of the coronary arterioles or cocaine-induced myocarditis.94) Scorpion envenomation Scorpion venom can cause diffuse LV hypokinesia Inhibitors,research,lifescience,medical and reduction of LV systolic function.95) The proposed mechanisms of LV systolic dysfunction

are massive release of catecholamines and/or direct toxic effect to the cardiomyocytes. Usually, the laboratory and echocardiographic features were normalized within 1 week and the clinical course is satisfactory. Interferon Interferon can cause diffuse LV systolic dysfunction by an unknown mechanism. Possible mechanisms include stimulation of an autoimmune or inflammatory reaction, increased demand for oxygen as a result of Inhibitors,research,lifescience,medical tissue reaction, or interferon-induced coronary spasm.96) Others Reversible cardiomyopathy and ventricular tachycardia can be associated with chronic inhalation of marijuana,97) high dose interleukin-2 treatment,98) and some Histamine H2 receptor psychotropic drugs including tricyclic antidepressants, phenothiazine and lithium. Conclusion Clinicians should use imaging tools to decide if there is a chance of reversibility when they face with heart failure patients. Imaging tools can give specific diagnosis and guide the treatment. Echocardiography is the most effective noninvasive screening tool to identify patients with LV dysfunction. It can measure LV systolic function along with detection of subsequent valvular and pericardial pathologies. Moreover, it can give hemodynamic information with using Doppler technology.