the mean blood pressure ( +/- se ) decreased in both the group that received verapamil ( from 171.4 +/- 3.2/93.0 +/- 2.5 mm hg to 142.9 +/- 2.8/79.0 +/- 2.0 mm hg ) and the group that received atenolol ( from 179.6 +/- 4.6/98.5 +/- 2.4 mm hg to 148.1 +/- 3.3/83.4 +/- 1.2 mm hg ) , but the atenolol-treated patients more frequently required the addition of chlorthalidone to achieve blood-pressure reduction ( p less than 0.01 ) .
C0004147
atenolol
C0020649
blood-pressure reduction