Source:http://linkedlifedata.com/resource/umls/id/C0178428
NCI: A failure of impulse formation in the sinus node. Sinus arrest is indistinguishable from third degree sinoatrial exit block on the standard ECG.,NCI: A failure of impulse formation in the sinus node. Sinus arrest is indistinguishable from third degree sinoatrial exit block on the standard ECG. (NCI)