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#edon lairtaonis #sa node #heart spark #cardiac impulse #heartbeat origin #electrical heart beat

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#edon lairtaonis #sa node #heart pacemaker #heart electricity #heart beat start #cardiac impulse

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#ekg #ecg #heart signal #cardiac impulse #cardiograph

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#heart block #av block #electrical conduction #signal block #cardiac impulse #arrhythmia

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#heart signal #cardiac impulse #electrical activity heart