Which type of pacemaker fires continuously regardless of heart activity?

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A fixed rate pacemaker is designed to deliver electrical impulses at a consistent, predetermined rate regardless of the intrinsic heart rhythm. This means it will continuously stimulate the heart even if the heart is already beating effectively on its own. The operation of a fixed rate pacemaker is crucial in situations where heart activity is inadequate, ensuring that the heart receives consistent pacing to maintain an adequate heart rate.

In contrast, demand mode pacing is only activated when the heart's natural pacing falls below a certain threshold. Asynchronous pacing, while it can also fire continuously, specifically refers to pacing that occurs without regard to the heart's intrinsic rhythm but is often used in specific situations rather than continuously. Responsive pacing reacts to heart activity and adjusts pacing based on the heart's needs, making it inherently different from a fixed rate pacemaker.