OBJECTIVES: Based on earlier studies it is known that certain harmful habits play an important role in the development of the cardiovascular diseases which influence development of complications and the successfulness of the rehabilitation after the operation. The aim of this study is to analyze whether the examined harmful habits and certain operative data influence the bleeding quantity after heart operation METHODS: Retrospective analysis was made on the University of Pécs Cardiotherapy Clinic among patients went through heart operation (n=611) between January 1, 2007 and December 31, 2007 in Hungary. Statistical tests: khí2 test, variance analysis (ANOVA), Pearson-Spearman correlation coefficient examination was made. Data processing was done with SPSS 15.0 and MS Excel programs. RESULTS: Significant difference was found between the total bleeding and the alcohol consumption habits (p=0.001). No connection was found with smoking habits (p>0.05). Direct proportion was found between aorta clinch time (p=0.03), the time of heart engine (0.039) and the use of the red blood cells. CONCLUSIONS: Postoperative bleeding is influenced by many factors: antecedents of patients, perioperative medication, operative data, and surgical technique. Based on the result of studies certain harmful habits and other operative data influence the postoperative bleeding in patients went through open heart operation.