[Mediastinitis].

Mediastinitis is defined as acute or chronic inflammation of the mediastinal structures and generally has a low incidence. The most frequent acute cause is sternotomy following cardiac revascularization surgery with both internal mammary arteries, with an incidence of 0.4% to 5% and a mortality of 16.5% to 47%. The most frequent vector is Staphylococcus aureus. Esophageal perforation, usually iatrogenic, is the second most frequent cause of acute mediastinitis, produced by common oropharyngeal flora, with a mortality rate of 20% to 60%, depending on the time of diagnosis. The third most frequent cause is descending necrotizing mediastinitis, the origin being an odontogenous focus in 60% and beta-hemolytic streptococcus the causative agent in 71.5% of cases. The most accurate diagnostic imaging technique is computed tomography. Treatment is almost always surgical and survival depends on its early performance. The worst postsurgical prognostic factor is septic shock.