The use of a looping ECG event recorder or<unk>  monitor can be very useful in ascertaining the frequency of atrial fibrillation and the rapidity of the ventricular response. It is also useful in gauging the frequency of ventricular tachycardia. This information can be used to guide treatment including pharmacotherapy and the need for automatic implantable cardiac defibrillator implantation.
Noncompaction cardiomyopathy holter monitoring
ST elevation myocardial infarction nitrate therapy
ST elevation myocardial infarction calcium channel blocker therapy
ST elevation myocardial infarction beta blocker therapy
First degree AV block echocardiography
Third degree AV block echocardiography
ST elevation myocardial infarction thienopyridine therapy
Pulseless ventricular tachycardia medical therapy