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Comparison of the cardiovascular effects of nifedipine and nicardipine in the presence of atenolol

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Summary

A placebo controlled double blind crossover study was performed in 12 healthy volunteers to compare the cardiovascular effects of single oral doses of nifedipine (5, 10 and 15 mg) and nicardipine (20 and 30 mg) in the presence of atenolol 100 mg. Haemodynamic measurements were made by transthoracic electrical bioimpedance cardiography (TEBC) 2 h following drug administration during passive tilting, graded bicycle exercise (30–150 W), and recovery from exercise.

In the absence of calcium channel blockade, atenolol reduced mean blood pressure, heart rate, and cardiac index, and increased stroke volume, peripheral resistance, pre-ejection period, and ventricular ejection time, particularly during and after exercise. In comparison with atenolol alone, addition of nifedipine or nicardipine reduced peripheral resistance but did not produce significant changes in stroke volume, cardiac output, dZ/dt[max], pre-ejection period (PEP), Ventricular ejection time (VET), PEP/VET, or Heather index at any point in the experiment. Similar reductions in peripheral resistance were produced by nifedipine 10 mg and nicardipine 20 and 30 mg. These apparently equivalent doses of nifedipine and nicardipine had similar effects on stroke volume, cardiac index, PEP/VET and Heather index.

Thus the increases in ventricular performance previously demonstrated in association with nifedipine and nicardipine therapy were not observed in the presence of β-adrenoceptor blockade. Under these conditions no important differences have been observed in the cardiovascular effects of these two calcium channel blockers.

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  1. Division of Pharmacological Sciences and Toxicology, United Medical and Dental Schools (St. Thomas' Campus), London, UK

    S. H. L. Thomas

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Thomas, S.H.L. Comparison of the cardiovascular effects of nifedipine and nicardipine in the presence of atenolol. Eur J Clin Pharmacol 41, 201–206 (1991). https://doi.org/10.1007/BF00315430

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  • DOI: https://doi.org/10.1007/BF00315430

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