Rarely, an infectious process affects the heart causing inflammation of the muscle itself, causing soemthing called myocarditis
, which usually presents with pump failure (shortness of breath
, swelling of legs, fatigue, dizziness, etc) which does not seem to be your case. A Right bundle branch block
usually is a relatively benign finding; an Echocardiogram
appears to be a good idea to rule out any structurural defects of the heart; also provides useful information about the pump function.
Hope this helps.
Mayo Clinic Rochester