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.
Catheter ablation to isolate the pulmonary veins to treat atrial fibrillation. Atrial fibrillation is often caused by rapidly discharging triggers, or hot spots. In catheter ablation to treat atrial fibrillation, a doctor inserts long, thin tubes (catheters) into your groin and guides them through blood vessels to your heart.