Underlying structural heart disease is generally absent.  Often, there is no precipitant of an episode. Risk<unk>  for precipitation of<unk>  include Alcohol, Anemia,Anxiety and Caffeine.
AVNRT risk factors
Atrial flutter risk factors
Ventricular fibrillation risk factors
Second degree AV block laboratory findings
Supraventricular tachycardia risk factors
AVNRT laboratory findings
Stress cardiomyopathy risk factors
Left ventricular aneurysm risk factors