Disturbances of the Conduction System Affect the Rate,rhythm,and Effectiveness of the Contracting

question 8

Multiple Choice

Disturbances of the conduction system affect the rate,rhythm,and effectiveness of the contracting heart.Surgical techniques have been developed to treat a variety of supraventricular dysrhythmias and both ischemic and nonischemic ventricular tachydysrhythmias.Preprocedural electrophysiologic mapping of the patient's conduction pathways identifies and locates aberrant pathways,or ectopic foci.A catheter is inserted percutaneously into the femoral vein or artery and threaded retrograde to the right or left atrium and ventricle.Various areas of the heart are tested in an attempt to reproduce the dysrhythmia;then the area of the heart where the rhythm disturbance originates is ablated.What directed energy source is employed to produce this selective ablation effect?

• A) Cryotherapy
• B) Ultrasonic energy
• C) Radiofrequency energy
• D) All three energy sources can produce the desired ablative effect.

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