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  • Title: Effects of diltiazem alone or with isosorbide dinitrate or with atenolol both acutely and chronically for stable angina pectoris.
    Author: el-Tamimi H, Davies GJ, Kaski JC, Vejar M, Galassi AR, Maseri A.
    Journal: Am J Cardiol; 1989 Oct 01; 64(12):717-24. PubMed ID: 2801521.
    Abstract:
    To establish the contribution of combination therapy in stable angina, the short- and long-term effects of diltiazem (120 mg and 360 mg/day, respectively), and the additive effects of sublingual isosorbide dinitrate, 10 mg, and atenolol, 100 mg, were studied in 11 patients with chronic stable angina using an open-label sequential design. All patients underwent exercise testing without therapy, and with each drug and their combinations. Exercise time and heart rate-blood pressure product were measured at 1-mm ST-segment depression, or at peak exercise if the test result was negative. Exercise time increased from a control value of 8.0 +/- 2.3 minutes (mean +/- standard deviation) to 11.4 +/- 2.4 minutes (p less than 0.0001) after the administration of isosorbide dinitrate, to 11.3 +/- 1.8 minutes (p less than 0.001) after short-term diltiazem and to 12.4 +/- 1.5 minutes (p less than 0.001) after long-term diltiazem. The rate-pressure product increased from a control value of 19,070 +/- 3,564 to 24,431 +/- 4,795 beats/min X mm Hg (p less than 0.0001) after isosorbide dinitrate, to 22,287 +/- 4,753 beats/min X mm Hg (p less than 0.01) after short-term diltiazem and to 21,812 +/- 3,976 beats/min X mm Hg (p less than 0.007) after long-term diltiazem. The addition of atenolol to long-term diltiazem significantly reduced the rate-pressure product compared with long-term diltiazem alone (21,812 +/- 3,976 vs 13,926 +/- 2,880 beats/min X mm Hg, (p less than 0.002), although there was no further significant increase in exercise time (12.4 +/- 1.5 vs 13.3 +/- 1.6 minutes).(ABSTRACT TRUNCATED AT 250 WORDS)
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