in an attempt to relieve ischaemic symptoms and to prevent progression to myocardial infarction , coronary angioplasty was attempted in 236 multivessel coronary heart disease patients with unstable angina , refractory to medical treatment including oral ca2+ antagonists , beta blockers and nitroglycerin drugs .
C0027051
myocardial infarction
C0017887
nitroglycerin