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.
Bradycardia (bray-dee-car'-dee-ah) is the medical term for a heart rate that is too slow. How slow is too slow varies. Babies usually have heart rates faster than adults do; so a heart rate of 80 may be fine for an adult but may be low for a newborn.