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Table 1 Classification of mediastinitis in patients undergoing cardiac surgery.

From: The concept of negative pressure wound therapy (NPWT) after poststernotomy mediastinitis – a single center experience with 54 patients

Class Description
Type I Mediastinitis presenting within 2 weeks after operation in the absence of risk factors
Type II Mediastinitis presenting at 2 to 6 weeks after operation in the absence of risk factors
Type IIIA Mediastinitis type I in the presence of one or more risk factors
Type IIIB Mediastinitis type II in the presence of one or more risk factors
Type IVA Mediastinitis type I, II, or III after one failed therapeutic trial
Type IVB Mediastinitis type I, II, or III after more than one failed therapeutic trial
Type V Mediastinitis presenting for the first time more than 6 weeks after operation
  1. According to El Oakley and Wright [8] mediastinitis is defined as wound infection associated with sternal osteomyelitis with or without infected retrosternal space. Incremental risk factors for mediastinitis are diabetes, obesity, and the requirement of immunosuppressive agents. Failed therapeutic trial includes any surgical intervention with intent to treat mediastinitis.