Study outcomes:
Primary outcome was in-hospital mortality. This variable was directly coded in NRD.
Secondary outcomes were length of stay, total charges, acute kidney injury, iatrogenic cardiac complication, post procedure bleeding, cardiac tamponade, hemopericardium, stroke, acute myocardial infarction, and readmission with a primary diagnosis of ventricular tachycardia within 30 days. Length of stay and total hospital charges were directly coded in NRD. Index admission was defined as the first admission with the primary diagnosis of ventricular tachycardia without prior admission in 30 days period. A readmission was defined as any readmission within 30 days of the index admission.