ARVMI during AIMI has been claimed to increase the in-hospital morbidity and mortality. 117 patients hospitalized between March 1997 to April 1999 were enrolled in this study. 71 patients had no signs of right ventricular involvement (Group A), whereas 46 patients had AIMI with ARVMI (Group B). There were no sinificant differences between groups for age, gender and mean atherosclerotic risk factors. However, Group B had significantly higher in-hospital complications and hospitalization duration (43% vs 21%, p=0.009 and 10.4+/-4.2 vs 7.9+/-1.9 days, p<0.001). In-hospital mortality rate was higher in Group B (11% vs 6%, p=0.312), but the difference did not reach statistical significance. Group B had lower left ventricular ejection fraction than Group A. As a result, diagnosis of patients with AIMI complicated by ARVMI must be made earlier, and applied more effective care and treatment because ARVMI increases in-hospital complications, hospitalization duration and mortality rate.