A Dual-Chamber Pacemaker Is Surgically Placed in a Patient's Chest

question 62

Multiple Choice

A dual-chamber pacemaker is surgically placed in a patient's chest.Wires then carry pulses to the right atrium and the right ventricle.Why would the pulses be carried to the right chambers of the heart and not the left chambers?

• A) The left chambers are reduced or absent in many subadults.
• B) The right chambers of the heart are weaker and need more stimulation.
• C) Only the right chambers of the heart need to contract to move blood to the lungs.
• D) It is easier to run the wires from the pacemaker through the vena cava.
• E) Once the right chambers are activated the pulse will be carried to the left chambers.

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