Why the study?
Does QT-interval sensing (TX) rate-responsive pacing improve heart rate and exercise tolerance compared to fixed-rate VVI pacing in pacemaker patients?
Population
37 patients (mean age 70 years) with QT-interval sensing (TX) rate-responsive pacemakers
Comparison
QT-interval sensing (TX) rate-responsive pacing vs Fixed-rate ventricular-inhibited pacing
Design
Cohort
Follow-up
mean of 27 months
Authors
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TX pacing may improve exercise tolerance in selected patients; leaves open confirmation of net benefit in randomized trials.
Does QT-interval sensing (TX) rate-responsive pacing improve heart rate and exercise tolerance compared to fixed-rate VVI pacing in pacemaker patients?
QT-interval sensing rate-responsive pacemakers provide adequate rate response and improved exercise tolerance compared to fixed-rate pacing, though complicated programming and worsening angina are notable limitations.
Anders Hedman (1989) studied this question.
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