Windows might tell you that you can't open it, or in the worst case, you might encounter a SCU file related error message. Before you can open a SCU file, you'll need to figure out what kind of file the SCU file extension refers to. Tip: Incorrect SCU file association errors can be a symptom of other underlying issues within your Windows operating system.
Relevance. Rating Newest Oldest. Best Answer: sinus bradycardia means slow heart rate sinus arrythmia means heart is not beating in the normal rythym but the heart beat is still starting in the right place. Many people live wiht this for their whole lives and never even know they have it. Stress less. Source(s): experience.
When the heart is not pumping sufficient blood because of a slow heartbeat, it may fall into one of the categories of bradycardia. Sick sinus: Normally the electrical messages in the heart begin in a cluster of cells in the right atrium, called the sinus node (SA node). The sinus node is your heart's natural pacemaker. If it is malfunctioning, it can cause the heart to beat too slowly or to alternate between fast and slow beating.