<prompt> Answer this question truthfullyWhat is a summary of sinus syndrome when an individual is ill?  <response>: <reason> Sick sinus syndrome occurs as an improperly propagated signal from the sinoatrial SA node. Age-dependent progressive fibrosis of the sinus nodal tissue and Remodeling of a sinuatrial node are the potential mechanisms of this abnormally formed signal propagation. MYH6 gene may also be involved in the pathogenesis of this condition. 