adrenergicbetablockers anginapectoris antagonists calcium calciumchannelblockers cardiovascularagents cardiovasculardiseases cardiovascularpharmacology cardiovascularsystem centralnervoussystem chemotherapy congresses coronarydisease coronaryheartdisease design diseases drugeffects drugs drugtherapy heart heartdiseases history medical nitrates pharmaceuticalpreparations qv132a24451981 qv132f917c1984 research sociology therapeuticuse wg298 wg300m4951992