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Onset and termination of atrial fibrillation are often associated with abrupt changes in heart rate. Presence and time-course of delayed adaptation of the QT/QTc interval are unknown, but a temporary “mismatch” between rate and the QT interval may enhance the risk of proarrhythmia.In a prospective two-part study, time-course of adaptation of ventricular repolarization after abrupt changes in heart...
The aims of the study were to evaluate the 24-h beat-to-beat heart rate (RR) and blood pressure changes during closed loop stimulation (DDD-CLS) pacing and conventional fixed rate DDD pacing with respect to spontaneous activity.We simultaneously and continuously measured beat-to-beat heart rate and blood pressure for 24h in patients implanted with Inos 2+ (Biotronik GmbH, Berlin, Germany)...
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