further prospective studies are needed , including repeat coronary arteriograms to evaluate the cause of unstable angina , define the role of coronary thrombosis , and evaluate the cause of unstable angina , define the role of coronary thrombosis , and evaluate the efficacy of more aggressive treatment adding the use of prolong heparin and antiplatelet agents prior to coronary angioplasty .
C0002965
unstable angina
C0019134
heparin