Results: On average, complication occurred within 13 days after operation; in a total of 25 lethal cases (2.4%), deaths occurred in eight (32%). Several risk factors for mediastinitis were identified as follows: 56% diabetes, 56% smoking, 20% obesity, 16% chronic obstructive pulmonary disease, and 8% end-stage renal disease. Mediastinitis was reported in 21 (84%) patients submitted to coronary artery bypass grafting and it was related to a major risk for development of infection (IC 3.44-8.30, P=0.0001). High rates of complications were observed: respiratory failure (44%), stroke (16%), cardiogenic shock (12%), acute renal failure (28%), pulmonary infection (36%), multiple organs failure (16%), and sternal dehiscence (48%). Bacterial cultures of exudates were positive in 84% of patients; Staphylococcus aureus was the most frequently pathogen (28.8%) detected.Conclusion: Mediastinitis remains as a severe surgical complication and difficult to manage in postoperative cardiovascular surgery. The disease has low incidence rate but high lethality. Coronary bypass was associated to a major risk for development of infection.Descriptors: Infection. Mediastinitis. Cardiac surgical procedures.
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