What types of signals are typically classified as unwanted sensed signals in cardiac devices?

Unwanted sensed signals in cardiac devices refer to the electrical signals that can be detected by the device but are not related to the heart's normal electrical activity. These signals can lead to inappropriate device behavior, such as unnecessary pacing or inhibition of the device's functions.

The correct choice includes T waves, far-field events, and skeletal muscle myopotentials, all of which are recognized as unwanted sensed signals.

T waves, while a natural part of the heart's electrical cycle, can sometimes be misinterpreted by devices, leading to inappropriate sensing events, especially in patients with certain arrhythmias or anatomical considerations. Far-field events refer to signals detected from neighboring heart chambers or other structures that may be far from the actual sensing electrode, causing confusion in the interpretation of cardiac activity. Skeletal muscle myopotentials arise from voluntary muscle contractions, which can create electrical signals that the device may sense as cardiac activity, thus constituting unwanted signals.

In contrast, the other options contain elements that are either normal physiological signals or not primarily classified as unwanted. They do not accurately represent the specific types of signals that lead to challenges in signal interpretation in cardiac devices.