conclusions the current study revealed that 44% of those who received prophylaxis did not need it. in the patients who received antibiotics, the most common mistakes were antibiotic selection followed by prolonged prophylaxis (> 24 hours) and excess dose. results of the total 8586 patients who took antibiotics for preventive purposes, 4815 (56%) required antimicrobial prophylaxis, and 3771 (44%...