How does the pacemaker respond in demand pacing?

In demand pacing, the primary function of the pacemaker is to monitor the heart's intrinsic activity and respond accordingly. The correct response involves withholding pacing when the device detects that the heart is generating its own electrical signals, which indicates that it is functioning normally. This ability to recognize and respond to intrinsic activity is crucial because it allows the pacemaker to provide support only when the heart's natural rate is inadequate, helping to maintain efficient heart function and preventing unnecessary pacing.

In this context, the pacemaker remains inactive when the heart is beating appropriately on its own, ensuring that it does not interfere with the natural rhythm. This selective pacing helps to optimize patient outcomes by allowing the heart to maintain its autonomous activity whenever possible.