Sinus bradycardia Sick sinus syndrome Sinus pause or arrest Tachy-brady syndrome Heart block Normal heart rhythm originates in the sinoatrial (SA) node, the heart's natural pacemaker, which ...
Sinus node dysfunction (SND) comprises a variety of abnormalities consisting of sinus arrest, sinus bradycardia, sinoatrial block, and alternating episodes of tachycardia and bradycardia.
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