We arrives on a side street two blocks away where there is a stretch of brick houses with high stoops and iron fences. View in context The firing died down and soldiers, talking eagerly, streamed out of a side street.
An irregular heartbeat is an arrhythmia (also called dysrhythmia). Heart rates can also be irregular. A normal heart rate is 50 to 100 beats per minute. Arrhythmias and abnormal heart rates don't necessarily occur together. Arrhythmias can occur with a normal heart rate, or with heart rates that are slow (called bradyarrhythmias -- less than 50 beats per minute).
normally the main pace maker of the heart is the SA node, which spontaneously discharges 60-100 times per min. disorders of impulse formation can cause dysrhythmias. a pacemaker from another site can lead to dysrhythmias and may increase rate and/or cause early or late beats.