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.
Ventricular premature complexes occur when the upper chambers of your heart contract sooner than the rest of your heart. When this happens, your heartbeat becomes out-of-sync. You may feel a regular heartbeat, an extra heartbeat, a pause, and then a stronger heartbeat.The extra heartbeat is the ventricular premature complex. It is not as strong as a normal beat and does not pump all of the blood out of the heart.f you experience ventricular premature complexes, you may not notice any symptoms. If symptoms are noticeable, they may include: 1  the sensation that your heart is fluttering. 2  the sensation that your heart is pounding or jumping in your chest. 3  the sensation that your heart has skipped a beat.