The group of 683 patients with the significant narrowing (> 70%) of at least one coronary vessel diagnosed by coronarography performed between 1976-1988 in the Institute of Cardiology in Warsaw was followed during one to seven years. The number of patients with a poor left ventricular function was high in the group treated surgically and non surgically. Ejection fraction < 50% was found in 27% and 43% respectively, LVEDP > 12 mmHg (66% and 69%), EDVI > 100 ml/m2 (58% and 70%). Survival curves were calculated in the two different subsets of patients treated surgically and non surgically. Despite some favorite trend toward a better outcome for patients treated surgically the differences were not statistically significant for a whole group. However we showed a significantly higher probability of survival in the subgroup of the three vessel disease treated surgically compared to other treatment. There were no significant differences in survival in patients with one, two, or three vessel disease treated surgically (survival probability of 0.82; 0.78; 0.84 respectively after 7 years). In patients treated non surgically the growing number of diseased vessels worsened the prognosis (survival probability of 0.84; 0.78; 056 respectively). In our observation the differences for better outcome in patients with poor left ventricular function treated surgically did not reach a statistical significance.