We assessed the frequency,efficacy,predictors,and long-term success of repeat enhanced external counterpulsation (EECP) therapy in relieving angina in a large cohort of patients who had chronic angina pectoris and had undergone a full course of EECP.Within 2 years of the initial course of EECP,the rate of repeat EECP was 18%,which occurred at a mean interval of 378 days after initial EECP.Of those who underwent repeat EECP,70% had a decrease of >1 angina class at the end of repeat EECP with similar decreases in nitroglycerin use.