Sinoatrial arrest & sinoatrial pause (sinus pause / arrest)
Sinoatrial arrest & sinoatrial pause (sinus pause/arrest): ECG characteristics & clinical implications Sinoatrial arrest occurs when the sinoatrial node does not discharge an impulse for ≥2 seconds. Failure to discharge an impulse within <2 seconds is defined as sinoatrial pause. Refer to Figure 1. Figure 1. Sinoatrial arrest. Also note the ST-segment elevations (which in this case has no relation to the sinoatrial arrest). As discussed in Chapter 1, if the sinoatrial node fails to discharge an impulse, there are three latent pacemaker structures that can (and will) discharge impulses that will salvage the situation. Latent pacemakers can continue discharging impulses until the sinoatrial node recovers and starts discharging. Less than 3 consecutive beats (or from a latent pacemaker (or any other ectopic focus) are referred to as escape beats. Three or more consecutive beats from a latent pacemaker (or other ectopic focus) is referred to as an escape rhythm. In most cases the …
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