A __ is an irregular heartbeat or rhythm. EKG Defibrilator Arrhythmia Palpitation

## Step 1<br />The problem is asking us to identify the term that describes an irregular heartbeat or rhythm. The options provided are EKG, Defibrillator, Arrhythmia, and Palpitation.<br /><br />## Step 2<br />An EKG (Electrocardiogram) is a test that measures the electrical activity of the heart. It does not describe an irregular heartbeat or rhythm.<br /><br />## Step 3<br />A Defibrillator is a device used to treat life-threatening cardiac dysrhythmias, ventricular fibrillation, and pulseless ventricular tachycardia. It does not describe an irregular heartbeat or rhythm.<br /><br />## Step 4<br />Arrhythmia is a term used to describe any change from the normal sequence of electrical impulses in the heart. This can lead to a fast, slow, or irregular heartbeat. This term fits the description of an irregular heartbeat or rhythm.<br /><br />## Step 5<br />Palpitation is a term used to describe the feeling or sensation that your heart is pounding or racing. It does not describe an irregular heartbeat or rhythm.