Well it all depends on what the Cardiologist diagnosed as the cause from various tests apart from an ECG. For example a clot to the lungs, cardiomyopathy, chronic lung disease, atrial and ventricular septal defects, among others. If a Cardiologist is unable to find any cause, then you will be classed as a normal variant and classed as safe. RBBB is not a rare thing and many have this condition and have been classed as normal variants. If your Cardiologist is happy you have no underlying cause, then you will be just fine with your plans. A 'normal variant' is not classed as a disease, your heart just works in a different way. It is possible your heart developed this way in the womb as the bundles formed.