verapamil-treated dogs showed higher ph of ischemic subendocardium after 15 min ischemia ( 6.75 +/- 0.07 ) than did the nifedipine ( 6.48 +/- 0.04 ) or placebo ( 6.43 +/- 0.05 ) groups , even if the animals were paced ( 6.71 +/- 0.11 ) to prevent the negative chronotropic effect of verapamil ( p less than 0.01 ) .
C1372752
negative chronotropic
C0042523
verapamil