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We present the case of a 38-year-old male with a history of acute chest pain associated with electrocardiographic ST-segment elevation and levels of myocardial damage markers. Few studies have evaluated chest pain and elevated troponin T during subacute thyroiditis. To the best of our knowledge, this is the reported case of myopericarditis associated with increased thyroid hormones in the bloodstream and accompanied by a significant increase in troponin T and cardiac magnetic resonance imaging findings of myopericarditis during the acute phase of subacute thyroiditis.

De winter pattern on the ECG is associated with occlusion of proximal left anterior descending artery. It is an atypical presentation of acute myocardial infarction due to LAD occlusion. We report a case due to thromboembolic occlusion of LAD after chemical cardioversion. It is imperative for cardiologists and physicians to instantly identify the De Winter pattern on ECG to appropriately triage these patients without delay.

This case series demonstrates how COVID-19 infection might affect the heart in the context of acute myocardial infarction. Atrioventricular (AV) block might appear as one of the significant cardiac complications of acute MI in patients who tested COVID-19 PCR positive regardless of the presence of CVOID-19 infection symptoms. In our series, conduction disorders as a complication of acute inferior STEMI are more common in patients who tested positive for the COVID-19 infection. 11 patients out of 18 inferior STEMI patients who have tested positive for the COVID-19 infection have atrioventricular block disorders.

Idiopathic left fascicular ventricular tachycardia (ILFVT) is characterized by right bundle branch block morphology and left axis deviation. We report a case of idiopathic left ventricular fascicular tachycardia in a young 31-year-old male patient presenting with a narrow complex tachycardia.