An equation that accurately estimates the glomerular filtration rate (GFR) in the Japanese population has been proposed; however, the prognostic significance of estimated GFR (eGFR) defined according to this equation has not been reported. In addition, the prognostic significance of eGFR during long-term follow-up after complete coronary revascularization remains unclear. We assessed the prognostic significance of eGFR values, estimated by the new Japanese equation, in a cohort of patients following complete coronary revascularization. We studied consecutive patients with complete revascularization from 1984 to 1992. Patients on dialysis were excluded. A novel Japanese equation was used to estimate the GFR: eGFR¼ 194Â(serum creatinine) À1.094 Â(age) À0.287 (Â0.739 if female). Multivariate Cox proportional hazards regression analyses were performed to determine all-cause and cardiac mortality. We analyzed data of 1809 patients, of whom 571 (31.6%) had an eGFR of X90 ml min À1 per 1.73 m 2 , 917 (50.7%) had an eGFR of 60-89 ml min À1 per 1.73 m 2 , 298 (16.5%) had an eGFR of 30-59 ml min À1 per 1.73 m 2 and 23 (1.3%) had an eGFR of o30 ml min À1 per 1.73 m 2 . During follow-up (11.4 ± 2.9 years), there were 397 (22.0%) all-cause and 123 (6.8%) cardiac deaths overall. Patients with an eGFR of 30-59 ml min À1 per 1.73 m 2 , and o30 ml min À1 per 1.73 m 2 revealed significantly greater risk of all-cause mortality than those with eGFR of X90 ml min À1 per 1.73 m 2 (hazard ratio (HR) 1.91, Po0.001, HR 3.35, Po0.001, respectively). Furthermore, incidence of cardiac death was higher in patients with an eGFR of 30-59 ml min À1 per 1.73 m 2 than those with an eGFR of X90 ml min À1 per 1.73 m 2 (HR 2.89, Po0.001). GFR as estimated using the new Japanese equation had a prognostic significance among patients with complete coronary revascularization.