under contract means there is an offer on it already and the buyer and seller are negotiating back and forth to come to an agreement. if ya need any more help just e-mail me. Lori lspalletta Â· 1 decade ago
Premature atrial complexes are caused by abnormal electrical impulses transmitted by the atria (either of the upper chambers of the heart). The abnormal electrical impulses cause contractions of the upper chamber of the heart earlier than expected. Such premature beats are generally harmless. slide 1 of 7.
Although heart disease is a common cause of premature complexes in canines, it is not the only disease or disorder that can induce a premature complex to form. If this disorder persists after underlying causes are eliminated antiarrhythmic medications may be prescribed in an attempt to prevent more troublesome arrhythmias from developing.