What type of pacing mode fires continuously regardless of the heart's electrical activity?

The pacing mode that fires continuously regardless of the heart's electrical activity is known as fixed rate mode. In this mode, the pacemaker generates impulses at a predetermined rate, independently of the intrinsic activity of the heart. This is particularly useful in situations where it is crucial to maintain a consistent heart rate, regardless of whether the heart can initiate its own electrical activity.

In contrast, demand mode pacing activates only when the heart's intrinsic rhythm falls below a certain threshold, allowing the heart to beat naturally whenever it is able. Asynchronous pacing can be a bit misleading, as it typically describes a scenario similar to fixed rate pacing but lacks synchronization with the heart's own electrical activity, making fixed rate the more precise term for continuous firing regardless of heart activity. Therefore, the correct selection is fixed rate mode, which outlines the pacemaker's ability to maintain constant pacing at all times.