![]() ![]() However, some ICDs also function as pacemakers, sending out a signal when the heart rate is too slow. When an ICD detects that the heart is beating far too fast or too erratically, the device sends out a shock to get the heart back into rhythm. When a pacemaker senses that the heartbeat is out of rhythm, the device sends out electrical pulses to speed up or slow down and steady the heart rate. There are some small differences between pacing and defibrillation systems. Tachy-brady syndrome, when the heart rate is irregular and fluctuates between too fast and too slow - a condition often seen in people diagnosed with atrial fibrillation. ![]()
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