What does the second letter of the NBG code represent?

The second letter of the NBG code represents "Chamber sensed" in the context of cardiac pacing and electrophysiology.

This coding system, which is standardized for pacemakers and implantable cardioverter-defibrillators (ICDs), provides important information about the device’s functions. The first letter indicates the chamber that is being paced, the second letter specifies which chamber(s) the device is sensing electrical activity from, and the third letter describes the response of the device to this sensing.

Understanding this aspect of the NBG code is crucial for clinicians and healthcare professionals, as it allows them to determine how the device interacts with the heart's natural electrical activity and guides them in managing patient care effectively. By knowing what chamber is being monitored for intrinsic activity, more accurate adjustments to therapy can be made, enhancing patient outcomes and device effectiveness.