a change from the normal rate or control of the hearts contractions
a disorder of the regular rhythmic function of the heart
Variation from normal rhythm of the heart beat.
refers to a group of conditions in which muscle contraction of the heart becomes irregular. An unusually fast rhythm (more than 100 beats per minute) is called tachycardia. An unusually slow rhythm (fewer than 60 beats per minute) is called bradycardia.
An abnormal heartbeat. Types of arrhythmias include tachycardias (fast heartbeats) and bradycardias (slow heartbeats).
A cardiac arrhythmia is any deviation from the normal rhythm of the heart.
Irregularity of the heartbeat caused by damage to or defect in the heart tissue and its electrical system. Three common types of arrhythmia are: 1) very rapid ventricular contractions (tachycardia) that don't pump enough blood flow to other organs; 2) an excessively slow heartbeat (bradychardia); or 3) most common, extra or "premature" beats.
Irregularity of the normal heart rhythm
Cardiac arrhythmia is a group of conditions in which the muscle contraction of the heart is irregular or is faster or slower than normal. Cardiac dysrhythmia might be a more correct phrase to describe the condition, as arrhythmia would imply that there is "no rhythm," but this term is not used frequently.