A patient with an irregular SA node conduction has a permanent pacemaker with the code "A A I O O" and now is going home. The patient asks, "What happens when my real SA node fires on its own?" The nurse responds that the pacemaker will:
1. not fire.
2. fire only the ventricles.
3. change the rate of firing.
4. fire both the atria and the ventricles.
1
The code is A (chamber-paced) atria, A (sense impulse) atria only, I (inhibit) inhibit firing from pacemaker, O (rate modification) no rate modification, O (multichamber) no other chambers to be stimulated by the pacemaker. If the SA fires on its own, the pacemaker does nothing until it fails to sense an impulse.
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