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.
From Wikipedia, the free encyclopedia. Athletic heart syndrome, (AHS) also known as athlete's heart, athletic bradycardia or exercise-induced cardiomegaly is a non-pathological condition commonly seen in sports medicine, in which the human heart is enlarged, and the resting heart rate is lower than normal.he ECG can detect sinus bradycardia, a resting heart rate of fewer than 60 beats per minute. This is often accompanied by sinus arrhythmia. The pulse of a person with athlete's heart can sometimes be irregular while at rest, but usually returns to normal after exercise begins.