Arrhythmia is the term for a medical ailment of the heart, so it is a noun. ex. "The patient was admitted at 6:37 AM with arrhythmia and labored breathing." ex. "What are the primary characteristics of arrhythmia?"
Cardiac arrhythmia refers to abnormal heart rhythm, as measured with an ECG. A "normal" rhythms is called a "Sinus Rhythm", as it originates in the Sinoatrial node of the heart. Any rhythm that originates elsewhere, or deviates from what is… Full Answer