The human heart is a four-chambered organ responsible for the distribution of blood throughout the body. While every physiological effort is made to ensure that such a vital organ can operate continuously without error, sometimes a pathological situation arises and the function of the heart is compromised. One such pathology arises when the electrical signal propagated throughout the heart (responsible for the heart's highly organized contractions) is hindered, resulting in a degradation of said conduction. This is referred to as a<unk><unk>  block and is seen clinically as rate-dependent<unk><unk>  block, right<unk><unk>  block or left<unk><unk>  block. Normal functioning In a healthy heart, specialized cells in the sinoatrial node are responsible for the generation of contractile stimuli that are directed throughout the heart. A direct neural-like pathway propagates this electrical signal from the SA node through the atrial tissue to a central nodal point in the center of the heart, the atrioventricular node. From here, the signal travels down a signal conducting channel (the<unk>  of His) where it will diverge into a left and right<unk>  that will control the left and right ventricle, respectively.
Tachycardia-dependent bundle branch block
Permanent junctional reciprocating tachycardia
AV nodal reentrant tachycardia
Second-degree atrioventricular block
Third-degree atrioventricular block
Junctional ectopic tachycardia
First-degree atrioventricular block
Atrioventricular reentrant tachycardia