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When sinus arrest occurs, the electrocardiogram will show a long P-P interval, which is not multiples of the basal sinus cycle, including physiological and pathological reasons.
xray chest of old woman show pacemaker cell
Generally, when the sinus heart rate is below 60 beats per minute, it is called sinus bradycardia. This arrhythmia can be both physiological and often pathological.
The 4-phase membrane potential of sinoatrial node pacing exhibits spontaneous depolarization, while the 4-phase membrane potential of ventricular myocytes remains stable.
When the sinus P wave on the ecg disappears, it may be due to abnormal generation and/or conduction of sinus impulses, or it may be due to atrial muscle lesions that cannot excite.

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