What does it mean if a device's response to sensing is 'triggered'?

When a device's response to sensing is described as 'triggered,' it signifies that the device has detected a specific physiological event, such as a heartbeat or other cardiac activity, that prompts it to initiate pacing. This action is crucial for maintaining an appropriate heart rhythm, as the device is designed to respond to certain electrical signals or events in the heart.

In certain cardiac devices, such as pacemakers, the term 'triggered' indicates that the device has recognized the need for additional pacing support in response to sensed activity. This can occur, for instance, if the heart's natural pacing is too slow or irregular, and the device takes over to ensure that the heart maintains a sufficient rate.

Understanding this concept is vital for interpreting how cardiac devices function and their role in managing various arrhythmic conditions. When pacing is initiated in response to a sensed event, it allows for the effective regulation of heart rate and rhythm, which is essential for maintaining proper hemodynamic status in patients.