CARDIAC DYSRHYTHMIAS ADVANCED

CARDIAC DYSRHYTHMIAS ADVANCED What is the pacemaker of the heart normally? - Correct answer-SA Node. Where does the SA node originate? - Correct answer-Upper right atrium. What is the pathway of conduction in the heart? - Correct answer-SA node - atria - AV node - bundle of his - bundle branches - purkinje fibers - ventricles. What does stimulation of the vagus nerve cause? - Correct answer-Decreased firing of the SA node and slowed impulse conduction of the AV node. What does stimulation of the sympathetic nerves cause? - Correct answer-Increased firing of the SA node and increased impulse through the AV node, and cardiac contractility. What does the P wave represent? - Correct answer-Time for the passage of the electrical impulse through the atrium causing atrial depolarization (contraction). What is the normal P wave duration? - Correct answer-0.06 - 0.12. What is a possible variation cause of a P wave? - Correct answer-Disturbance in conduction within the atria. What does the PR interval represent? - Correct answer-The measure from the beginning of the P wave to the beginning of the QRS complex, represents time taken for impulse to spread through the atria, AV node, and bundle of his, the bundle branches and purkinje fibers, to a point of immediately preceding ventricular contraction. What is the normal PR interval? - Correct answer-0.12 - 0.20.