How are arrhythmias characterized?

Arrhythmias are characterized by abnormal heart rhythms, which encompass any deviation from the normal rhythm of the heart. This includes variations such as the heart beating too fast (tachycardia), too slow (bradycardia), or in an irregular pattern. The term "arrhythmia" itself indicates a lack of a regular rhythm, thus highlighting the key aspect of abnormality in heart function.

Understanding the context of the various choices is essential. Regular heart rhythms represent a state of normalcy, while a slow heart rate describes just one type of arrhythmia that may occur but does not encompass all forms. Increased blood pressure is a separate cardiovascular condition that may be associated with or influence arrhythmias, but it does not characterize them. It is the presence of any abnormality in the electrical activity or rhythm of the heart that defines arrhythmias, making the characterization of abnormal heart rhythms the most accurate option.