Key result
Cardiac pacing may benefit patients with long QT syndrome, particularly LQT3 and those with pause-dependent arrhythmias, by preventing proarrhythmic pauses through optimized pacemaker programming.
Why the study?
Does cardiac pacing prevent arrhythmic death in patients with long QT syndrome?
Does cardiac pacing prevent arrhythmic death in patients with long QT syndrome?
Cardiac pacing, particularly with pause-prevention algorithms and sufficiently fast lower rate limits, may prevent arrhythmic death in LQTS patients, especially those with LQT3 or pause-dependent arrhythmias.
Answers are grounded in this paper and cite their sources.
May support pacing in select LQTS patients; leaves open whether it prevents arrhythmic death pending prospective trials.
A review of published data on cardiac pacing in the long QT syndrome (LQTS) is presented, in the hope that optimization of patient selection and pacemaker programming will prevent arrhythmic death. LQT3 patients may derive particular benefit from pacing because the dispersion of repolarization worsens steeply during bradycardia in this genotype. However, concluding that other genotypes will not benefit from pacing is premature. Pacing may be especially beneficial for patients with "pause-dependent" arrhythmias. Programming should include a sufficiently fast lower rate limit. Features that allow heart rate slowing beyond the lower rate limit or that may trigger pauses must be programmed "off" because pauses are proarrhythmic in this population. Pause-prevention pacing algorithms may be beneficial.
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Sami Viskin (2000) conducted a review in Long QT syndrome (LQTS). Cardiac pacing was evaluated. Cardiac pacing may benefit patients with long QT syndrome, particularly LQT3 and those with pause-dependent arrhythmias, by preventing proarrhythmic pauses through optimized pacemaker programming.
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