6 patients with atrial fibrillation and ventricular pre-excitation were given adenosine , with no effect on mean ventricular rate ( averaged over 3 s ) , although a significant , but short-lived , reduction in minimum rr interval was observed ( from 242 ms , sd 45 , to 217 ms , sd 39 ) .
C0004238
atrial fibrillation
C0001443
adenosine