A small amount of 96% ethanol is injected into the septal artery inducing a localized infarction in the ventricular septum.
The first sound is the simultaneous closure of the A/V valves, which is at the start of the ventricular systole.
In some patients an increase in ventricular ectopy including non-sustained ventricular tachycardia has been observed which did not affect patient safety or outcome.
First of all ventricular tachycardia - tachycardia is a term used to describe a heart rate above 100 beats per minute.
Patients who survive either ventricular fibrillation or sustained ventricular tachycardia have a high risk of further episodes, which may be fatal.