A series of nerve bundles or groups enter down through the heart through the middle wall (septum)and split to come back upwards towards both the right and left chambers of the heart. If trauma, or more likely in injury due to small areas where the heart muscle has died, occurs there may be an interruption in the ability for nerve pulses to go past this point. This changes the regular (normal sinus) rhythm and speed of the heart beating into an irregular arrhythmia and is often associated with slowing of the heart rate.
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This diagnosis means that the heartbeat is being initiated in the sianoatrial node, which is normal. The incomplete right bundle branch block means that after the electrical signal travels through the atrioventricular node and through the bundle of His, it travels down the left bundle branch in the ventricles normally, but the right bundle branch blocks the electrical signal. This means the depolarization of the right ventricle will happen more slowly because it will receive the signal to depolarize from the slower muscle fibers of the ventricles instead of the much faster fibers of the right bundle branch. This rhythm will likely show up on a heart monitor with a normal P wave, normal P-R interval, wide QRS complex and a wide T wave.
An incomplete right bundle branch block is an interruption in the heart's electrical conduction system. Incomplete means it has not completely failed.
The only treatment for an incomplete right bundle branch block is specific medications. This is not a cure but it will help relieve some of the symptoms.