fifteen patients with no collaterals were compared with 35 patients with collaterals , and to a subset of 11 patients with very rich right-to-left collaterals , and there was no significant difference in historic or ecg evidence of old infarction , duration of angina , incidence of unstable angina , left ventricular end-diastolic pressure , cardiac index , ejection fraction , or segmental contraction abnormalities .
C0002962
angina
C0002965
unstable angina