QRS synchronous pacing
A pacing mode where ventricular stimuli are delivered in synchrony with intrinsic QRS complexes to maintain cardiac output.
Full Definition
QRS synchronous pacing is a specialized pacing technique where ventricular pacing pulses are delivered during or immediately after intrinsic QRS complexes, rather than inhibiting pacing output. This approach may be used in specific clinical situations where maintaining ventricular stimulation is desired despite intrinsic conduction, such as during certain diagnostic procedures or in patients with intermittent conduction abnormalities. The technique requires precise timing to avoid competing with intrinsic conduction while ensuring adequate cardiac stimulation. Unlike traditional demand pacing that inhibits output when intrinsic activity is sensed, QRS synchronous pacing maintains stimulus delivery but times it to work with, rather than against, the heart's natural electrical activity. This mode is less commonly used than standard inhibited pacing modes but has specific applications in certain clinical scenarios.
Usage
Usage note: Rare pacing mode; ensure clear distinction from standard demand pacing in documentation.
In Context
- "QRS synchronous pacing was temporarily enabled during the electrophysiology study to maintain ventricular stimulation." — Procedure report
- "The device switched to QRS synchronous pacing mode when magnet application was detected." — Technical specification document