far-field sensing
Detection of cardiac electrical activity from a chamber other than where the sensing electrode is located, potentially causing inappropriate device responses.
Full Definition
Far-field sensing occurs when a cardiac device electrode detects electrical signals from cardiac chambers other than the intended sensing location. For example, an atrial lead may sense ventricular depolarization, or a ventricular lead may sense atrial activity. This phenomenon can lead to inappropriate device behavior such as pacing inhibition, mode switching, or inappropriate shock delivery. Modern devices incorporate sophisticated filtering algorithms and sensing configurations to minimize far-field sensing while maintaining appropriate sensitivity to local cardiac activity.
Usage
Usage note: Hyphenate when used as a compound modifier.
In Context
- "Far-field sensing of ventricular activity by the atrial lead caused inappropriate mode switching episodes." — Device troubleshooting report
- "Programming adjustments to atrial sensitivity reduced far-field sensing without compromising intrinsic P-wave detection." — Clinical case study