provoked arrhythmias were observed to be more frequently nonreproducible ( as reflected in a major change in rate or duration , or both , of an induced ventricular arrhythmia between baseline tests ) as the number of extrastimuli increased from one ( 7 % ) to four ( 27 % ) .
C0003811
arrhythmias
C0085612
ventricular arrhythmia