Atrial Rhythm Disturbances (continuation)
In persons with narrowed coronary arteries, the onset of atrial fibrillation may produce chest pain, particularly
if the heart rate speeds up dramatically. This combination of symptoms is frequently a warning sign of pending
heart failure or a heart attack. The rapid beat must therefore be slowed immediately with either drugs or a medical
procedure.
Another significant rhythm disturbance is atrial tachycardia, in which the muscles of the atrium beat much faster
than those of the ventricle, producing an erratic heart rate. Symptoms such as a sense of fullness in the chest,
light-headedness and chest flutters are also common. Problems often associated with this disturbance include
rheumatic heart defects, hyperthyroidism, pneumonia and blood clots in the lungs. Drug therapy is often the most
effective treatment.
Ventricular Rhythm Disturbances
The relay cells in the ventricles, like those in the atria, also may acquire the ability to produce a heartbeat
on their own. Called a ventricular premature beat, this condition may be traceable to excessive use of caffeine,
cigarettes or alcohol. But since it can also be the sign of a serious cardiac disorder, it should be investigated.
Prompt medical attention is crucial in cases of ventricular tachycardia. As its name implies, this problem involves
rapid beating of the ventricles (usually over 100 to 120 beats per minute), and the danger is that the rate may
increase even further, leading to ventricular fibrillation and possibly death.
Summing Up
Disturbances in heartbeat and heart rhythm are among the most common forms of cardiac disorders. While not all such
disturbances have medical significance, some can be extremely serious unless they receive proper medical attention.
Drug therapy is often used to treat various forms of arrhythmias, strict adherence o the dosage instructions given
by your doctor is most important.
