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Figure 1 The dynamic overdrive pacing algorithm allows atrial pacing in the AAI mode, always just above the patient’s own rhythm. When a premature beat is sensed, the algorithm increases the heart rate by shortening its escape interval by 50 ms to a programmed upper rate limit. The pacing cycle length is then gradually increased by 5 ms per stimulus until the lower rate limit is reached or another spontaneous beat is sensed.
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