retrospective review of hospital charts indicated that 3 clinical factors serve as effective markers in determining length of stay : need for amiodarone , induction of sustained ventricular tachycardia ( vt ) or ventricular fibrillation ( vf ) , and presence of serious other medical problems that require stabilization before electrophysiologic testing .
C0002598
amiodarone
C0042510
ventricular fibrillation