Question

any abnormal cardiac rhythm is called a(n) ________.

Explanation:

This question is about medical terminology related to the heart's rhythm. In the field of Medicine and Health (a subfield of Natural Science), an abnormal cardiac rhythm is defined as an arrhythmia. This is a key term in cardiovascular medicine, where arrhythmias refer to any deviation from the normal heart rhythm, including irregularities in rate, rhythm, or conduction.

Answer:

arrhythmia