Critical Nursing Cardiac Dysrhythmias Advanced Questions and Answers 2024

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1. What is the pacemaker of the heart normally? Answer: SA Node. 2. Where does the SA node originate? Answer: Upper right atrium. 3. What is the pathway of conduction in the heart? Answer: SA nod... e -> atria -> AV node -> bundle of his -> bundle branches -> purkinje fibers -> ventricles. 4. What does stimulation of the vagus nerve cause? Answer: Decreased firing of the SAnode and slowed impulse conduction of the AV node. 5. What does stimulation of the sympathetic nerves cause? Answer: Increased firing ofthe SA node and increased impulse through the AV node, and cardiac contractility. 6. What does the P wave represent? Answer: Time for the passage of the electricalimpulse through the atrium causing atrial depolarization (contraction). 7. What is the normal P wave duration? Answer: 0.06 - 0.12. 8. What is a possible variation cause of a P wave? Answer: Disturbance in conductionwithin the atria. 9. What does the PR interval represent? Answer: The measure from the beginning of theP 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 andpurkinje fibers, to a point of immediately preceding ventricular contraction. 10. What is the normal PR interval? Answer: 0.12 - 0.20. 11. What is a possible variation cause with PRinterval? Answer: Disturbance in conduction usually in the AV node, bundle of his, or bundle branches but can be atria as well [Show More]

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