Cellosaurus Disease Terminology Cardiovascular System Finding Sinus Node Dysfunction Finding A derangement in the normal functioning of the sinoatrial node. Typically, SA node dysfunction is manifest as sinoatrial exit block or sinus arrest, but may present as an absolute or relative bradycardia in the presence of a stressor. It may be associated with bradycardia-tachycardia syndrome C3276313 C62243 Sinus Node Dysfunction Sinus_Node_Dysfunction Cellosaurus Sinus Node Dysfunction