frequency of angina , nitroglycerin consumption , exercise tolerance ( naughton protocol ) , and frequency of daily episodes of st segment deviations on the electrocardiogram ( 1 mm of st segment depression persisting for at least 1 min with and without chest pain ) on an ambulatory electrocardiographic monitor were assessed during the baseline placebo , active monotherapy , placebo withdrawal , and combination treatment phases .
C0002962
angina
C0017887
nitroglycerin