Slow or absent conduction through the<unk><unk>  branch means that it takes longer than normal for the<unk>  ventricle to fully depolarise. This can be due to a damaged<unk>  branch that is completely unable to conduct, but may represent intact conduction that is slower than normal.<unk>  may be fixed, present at all times, but may be intermittent for example occurring only during rapid heart rates. This may be due to the<unk>  having a longer refractory period than usual.
Left bundle branch block
Right bundle branch block
Bundle branch block
Sinoatrial block
Pre-excitation syndrome
Atrioventricular block
Sinoatrial arrest
Ventricular flutter