Table 3.

Potential electrocardiographic and echocardiographic findings in MIS-C

Electrocardiographic abnormalities and arrhythmias
Abnormalities related to myocardial dysfunction or myocarditis	Diffuse ST segment elevation or depression T wave abnormality (inversion in lateral leads) Low QRS voltages Premature ventricular contractions Ventricular tachycardia
Abnormalities similar to Kawasaki disease	Non-specific ST and T wave changes Myocardial ischemia PR prolongation Ventricular arrhythmia
Sinus node dysfunction and heart block	Sinus node dysfunction (bradycardia) PR prolongation Atrioventricular block
Inherited arrhythmias and sudden death	Prolonged QT Unmasking of Brugada pattern in patients with underlying Brugada syndrome in setting of fever Sudden cardiac death due to fatal arrhythmias
Echocardiographic abnormalities
Ventricles	Depressed function of either or both ventricles, may be severe and may exhibit global or regional dysfunction
	Abnormal myocardial strain
	Apical thrombus in setting of severely depressed function
Coronary arteries	Abnormal enhancement of coronary arterial walls
	Coronary arterial ectasia or dilation
	Aneurysm formation
	Thrombus formation in setting of severe coronary dilation
Valves	Valvulitis with valvar insufficiency, particularly the mitral valve
Pericardium	Pericardial effusion
Aortic root	Aortic root dilation