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A 67-year-old male patient received a pacemaker for syncope. His parameters at check-up were: P/R amplitude 2.8/11 mV and atrial/ventricular threshold 0.875/0.625. The pacemaker was programmed as follows: lower rate 60 bpm; upper tracking rate 130 bpm; sensed AV interval 120 ms; paced AV interval 50 ms; atrial/ventricular sensitivity 0.5/5.6 mV, and atrial/ventricular output 2/2 V. Due to syncope in his history, the rate drop response was also activated: drop size 25 bpm; drop rate 50 bpm; detection beats: 2 beats. Both with an intervention rate of 100 bpm.
The following ECG was recorded during carotid massage (Fig. 1). What is the explanation for this interesting ECG recording?
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Böhm, A., Kiss, R.G., Bogyi, P. et al. Temporary severe bradycardia due to pacemaker programming. Neth Heart J 24, 488 (2016). https://doi.org/10.1007/s12471-016-0855-1
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DOI: https://doi.org/10.1007/s12471-016-0855-1