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.
Causes of Atrial flutter. Causes of Atrial flutter. Atrial flutter is generally caused by age-related deterioration of the heart, as the risk for atrial fibrillation increases past age 60. Atrial flutter is similar to but more metrical than atrial fibrillation. List of causes of Atrial flutter.