1. Trazodone, Desyrel, Trazon, Trialodine Pharmacology-HealthyPlace.com
Caution should be used when administering trazodone to patients with cardiac disease, and such patients should be closely monitored, since antidepressant drugs (including trazodone) have been associated with the occurrence of cardiac arrhythmias.
http://www.healthyplace.com/medications/trazodone.htm

2. Propranolol -- Health Wellness - Mind
Atrial flutter, Atrial Fibrillation, and Junctional and Atrial Ectopic Tachycardia," Ann Pharmacother. Marked slowing of heart rate may occur in cirrhosis with conventional doses; low initial dose and regular heart rate monitoring.
http://www.wellness.com/resources/Complementary%20and%20Alternative%20Medicine/...

3. Aging of your Heart and Blood Vessels is Risky -- Medical Articles - Health Topics, Reviews and C...
Serious arrhythmias, however, are most often caused by underlying heart disease, commonly coronary heart disease, heart valve problems, and heart failure. For example, premature atrial beats or contractions (PAC's), and atrial tachycardia...
http://www.healthandage.com/html/res/aging_of_you/content/15.html