Threshold

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Threshold

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References in periodicals archive ?
The pacing threshold and impedance at the time of implantation and follow-up was noted (Tables-1-2).
It measured atrial pacing threshold automatically and regularly every 8 or 24 h for out-of-clinic use and immediately by user initiated threshold search for in-clinic use.
This study investigated the effect of severity, distribution of CAD and left ventricular ejection fraction (LVEF) on acute ventricular pacing threshold and lead impedance at the time of either antibradycardic pacemaker (PM) or implantable cardiac defibrillator (ICD) implantations in our institution for various indications.
By gradually increasing the pacing current until stable capture of atrial pacing was confirmed by surface ECG, the pacing threshold of all 9 electrode positions was found.
The three parameters used are lead impedance, sensing (R-wave amplitude), and capture (pacing threshold).
*Acceptable pacing threshold (acute): With 0.5 ms of the pulse width, the pacing threshold of the right atrium was ≤1.5 V and the threshold of the right ventricle was ≤1.0 V.
A change in the pacing threshold can be a sign of RV perforation by the pacemaker lead.
Pacing threshold, R wave and impedance of ventricular lead during implant were 0.7 V at 0.5 msec, 7 mV and 350 ohms, respectively.
Key words: pacemakers, longevity, pulse amplitude, pulse width, pacing threshold
Potential complications include device dislodgement, cardiac perforation, elevated pacing thresholds requiring device retrieval and reimplanatation, and vascular complications.