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Explain overdrive suppression and its significance in cardiac rhythm.
Biology
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Overdrive suppression is when a pacemaker's natural rhythm (automaticity) is temporarily depressed after it has been excited by a faster rhythm for a period.
This explains two key phenomena:
- Why the heart's latent pacemakers (other cells that can generate a rhythm) are normally suppressed by the faster sinoatrial node (SAN), which is the heart's primary pacemaker.
- Why the SAN itself can be suppressed if an ectopic focus (an abnormal site in the heart) fires at a higher frequency than the SAN, as seen in conditions like atrial flutter or fibrillation. In these cases, the ectopic focus takes over as the heart's pacemaker.
If this faster ectopic focus suddenly stops firing, the SAN will not immediately resume its activity. It requires a recovery period, known as the sinus node recovery time, to overcome the suppression. During this interval, the heart stops beating, and if prolonged, it can lead to syncope (loss of consciousness).
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