No: Generally RBBB is not serious - it can even be present from birth. With your hx of SVT, there are certain abnormalities that need to be considered and excluded: atrial septal defect and mitral stenosis. Lung conditions can cause it. Sometime high blood pressure is the cause. There are rare causes too, but in most cases, it's an isolated finding of no significance. In itself RBBB causes no symptoms
Answered 5/10/2015
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