Can a heart murmur be the result of a seizure?

Yes. A heart murmur is caused by a AVSD (Atrioventricular Septal Defect; a hole between the atria and between the ventricals) , VSD (Ventricular Septal Defect; as AVSD but just the ventricals) or an ASD (Atrial Septal Defect) Also it could be caused with valve stenois