Explain the pathophysiology of the impulse origin and the electrical impulse pathway that is associated with the following rhythms:
Normal sinus rhythm In NSR, there is normal conduction of the sinus impulse through the atria and ventricles. The impulse is generated from the sinoatrial node and is delivered through the atria. Once past the atria, the pulse reaches the AV node where it pauses before continuing through the ventricles. From there the impulse is conducted through the ventricles via bundle branches and Purkinje fibers.
During a junctional rhythm, the SA node fails to fire. Cardiac cells all possess the ability of generating a pulse if the SA node were to fail. The rhythm is typically created within or near ...