What is the most common cause of acute mediastinitis?

What is the most common cause of acute mediastinitis?

• A. Esophageal perforation
• B. Pneumothorax
• C. Myocardial infarction
• D. Pulmonary embolism

Answer: (A)

Acute mediastinitis is an infection of the mediastinal space that spreads rapidly once contamination occurs. The esophagus is the most common source because a breach allows oral and gastric contents full of bacteria to spill directly into the mediastinum. This can happen with instrumentation or endoscopic procedures, or spontaneously after severe vomiting (boerhaave syndrome). The result is a fulminant infection of the mediastinal tissues. The other options—pneumothorax (air in the pleural space), myocardial infarction (heart muscle ischemia), and pulmonary embolism (clot in the lungs)—produce chest symptoms through different mechanisms and do not directly introduce infectious material into the mediastinum, so they are not the usual sources of acute mediastinitis.

Acute mediastinitis is an infection of the mediastinal space that spreads rapidly once contamination occurs. The esophagus is the most common source because a breach allows oral and gastric contents full of bacteria to spill directly into the mediastinum. This can happen with instrumentation or endoscopic procedures, or spontaneously after severe vomiting (boerhaave syndrome). The result is a fulminant infection of the mediastinal tissues. The other options—pneumothorax (air in the pleural space), myocardial infarction (heart muscle ischemia), and pulmonary embolism (clot in the lungs)—produce chest symptoms through different mechanisms and do not directly introduce infectious material into the mediastinum, so they are not the usual sources of acute mediastinitis.