Background: Median sternotomy wound infections are infrequent yet potentially fatal complication following cardiac surgery. The reported incidence of sternal infections ranges from 0.9 to 20%, and the incidence of mediastinitis is 1–2% in most studies. Several studies have examined and identified possible causes and risk factors associated with sternal infections. They include patient-related risk factors, and procedure-related factors. Aim of the study is the assessment of the patient's risk factors related to incidence of infection. Patients and Methods: ninety-eight cardiac surgery patients operated via median sternotomy were included in the study and the role of patient related factors (age, gender, obesity and diabetes mellitus) in the incidence of postoperative superficial and deep sternal wound infection was accessed. Results: Sternal wound infection (SWI) developed in 18 patients (18.36%). 15 patients (15.3%) had superficial SWI while 3 patients (3.06%) had deep SWI. The most common causative organism in our study was staph. aureus especially MRSA. Conclusion: Patient-related risk factors such as age, gender, obesity and diabetes mellitus are important risk factors in the development sternal wound infection.