sensing vector
The electrical pathway between electrodes used by a cardiac device to detect intrinsic cardiac activity.
Full Definition
A sensing vector defines the electrical path between two electrodes that a cardiac device uses to detect and measure intrinsic cardiac electrical activity. The vector is determined by the physical separation and orientation of the electrodes, which can be configured between different combinations such as tip-to-ring (bipolar), tip-to-device housing (unipolar), or between multiple electrodes in complex lead systems. The choice of sensing vector affects the device's ability to detect cardiac signals while minimizing interference from external sources, muscle activity, or other artifacts. Different vectors may have varying sensitivity to P-waves, R-waves, or T-waves, and optimal vector selection is crucial for proper device function. Modern devices often allow programming of multiple sensing vectors and may automatically switch between them based on signal quality or specific clinical needs.
Usage
Usage note: Distinguish from pacing and shock vectors; specify electrode pairs when documenting configurations.
In Context
- "The sensing vector was changed from tip-to-ring to tip-to-coil to improve R-wave amplitude detection." — Device optimization report
- "Multiple sensing vectors are available in this ICD system to accommodate varying patient anatomies." — Technical specification document