I myself have a conduction defect called "Left Bundle Branch Block".
This is what master Aerosmith replied on my post last year :
There are several types of left bundle branch block (LBBB), each
different. In every case, the nerve impulse is blocked or
delayed. Patients with LBBB may have left ventricular disease
or cardiomyopathy.
Left bundle branch block is usually caused by another disease,
such as clogged arteries, rheumatic fever, congenital heart
disease, myocarditis, or heart attack. Right bundle branch
block happens less often from an underlying heart disease.
Detection of LBBB usually happens during a normal physical
exam. There is no specific therapy for LBBB. Patients are usually
treated for associated heart diseases.
Prognosis for a person with blockage in any of the 3 bundle
branches depends on the associated heart disease. The
associated diseases determine the outcome of the patient's
health.
Occasionally, disruptions in bundle branches lead to complete
infranodal A-V block, a more serious blockage of nerve
impulses. About 2% of patients with LBBB develop infranodal
A-V blockage and these patients often require implanted
pacemakers.
So basically prognosis is usually considered on the underlying
disease, however some patients have no underlying diease. Most
often there are no symptoms with LBBB; if there is it usually means
there is a very significant block. If you have no major blockage
and no underlying heart disease, as you can see your chances for
something serious of happening are only about 2%. More than likely
with this alone you have a great prognosis and will be able to live a
normal life. Its history is the same of any other arrythmia. It was simply
discovered. Have a good one.
| 
Conduction Defect???? 
Linear Mode
