An abnormal heart rhythm. In an arrhythmia the heartbeats may be too slow, too rapid, too irregular, or too early. Rapid arrhythmias (greater than 100 beats per minute) are called tachycardias. Slow arrhythmias (slower than 60 beats per minute) are called bradycardias. Irregular heart rhythms are called fibrillations (as in atrial fibrillation and [..]

The normal increase in heart rate that occurs during inspiration (when you breathe in). This is a natural response and is more accentuated in children than adults. The "sinus" refers to the natural pacemaker of the heart which is called the sinoatrial (or sinus) node. It is located in the wall of the right atrium (the right upper chamber [..]

Any variation from the normal rhythm of the heartbeat.

Changes in the rhythm of heartbeats or in the strength of heart contractions

An abnormal rhythm of the heart.

An abnormal heart rhythm.

irregular heartbeat (pop)

Irregularity of the heart rhythm or an abnormality in the pattern or time of the heartbeat. See images and products related to this entry

(n) an abnormal rate of muscle contractions in the heart

An abnormal heart rhythm caused by a disturbance in the heart's electrical system.

An irregular heartbeat.

Also known as an irregular heartbeat, it is the interruption of a heart rhythm.

irregularity or absence of the heart rhythm caused by disturbances in transmission of electrical impulses through cardiac tissue.

also known as cardiac dysrhythmia or irregular heartbeat is a group of conditions in which the heartbeat is irregular, too fast, or too slow.

an abnormal heart rhythm. The heart rhythm may be too fast (tachycardia), too slow (bradycardia) or irregular. Some arrhythmias, such as ventricular fibrillation, may lead to cardiac arrest if not tre [..]

Any disturbances of the normal rhythmic beating of the Heart or Myocardial Contraction. Cardiac arrhythmias can be classified by the abnormalities in Heart Rate, disorders of electrical impulse genera [..]

Irregular Heart Rate caused by abnormal function of the Sinoatrial Node. It is characterized by a greater than 10% change between the maximum and the minimum sinus cycle length or 120 milliseconds.

Any irregularity in rhythm or rate of the heartbeat.

Any variation from the normal rhythm or rate of the heart beat.

Irregularity of the heart rate related to functioning of the sinoatrial node.

An abnormal pattern of contraction of the heart, caused by a disturbance in conduction of the normal electrical impulses within the heart.

Arrhythmias are also called heart rhythm problems. A disorder of the heart rate or heart rhythm. Arrhythmias occur when the heart that beats too fast (called tachycardia), too slow (called bradycardia [..]

An arrhythmia is a change in either the speed or the pattern of your heartbeat, causing an abnormal heart rhythm.

any change in the normal pattern of the heart beat

An irregular heartbeat.

an abnormal heartbeat.

An abnormal heart rhythm. Arrhythmic:

An irregular heartbeat.