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.
Quick Answer. A malfunction in the sinus node in the heart may cause sinus bradycardia, according to the Heart Rhythm Society. The sinus node, located in the right atrium of the heart, may misfire, wear out or slow down over time, and these problems can lead to an abnormally slow heart rate. Slow heart rates generally go below 60 beats per minute.