A 64-year-old woman is evaluated in the emergency department 12 days after undergoing a coronary artery bypass grafting (CABG) procedure. She reports a 2-day history of increasing retrosternal pain, fever, and profound fatigue. Her temperature is 38.8°C (101.8°F), heart rate is 112/min, blood pressure is 105/65 mmHg, and respiratory rate is 18/min. Physical examination reveals erythema, induration, and a small amount of purulent drainage from the inferior aspect of the sternotomy incision. A palpable 'click' and abnormal movement are felt over the sternum during respiration. Arrange the following management steps in the most appropriate chronological order.
- 1Obtain blood cultures and aerobic/anaerobic deep wound cultures.
- 2Administer empiric broad-spectrum intravenous antibiotics.
- 3Obtain a computed tomography (CT) scan of the chest.
- 4Perform surgical exploration with sternal debridement and delayed closure.
Cevap
The correct chronological sequence for managing acute postoperative mediastinitis is to first obtain microbiological cultures, immediately follow with empiric broad-spectrum intravenous antibiotics, then obtain a computed tomography (CT) scan of the chest to delineate the infection, and finally proceed with definitive surgical exploration and debridement.
The presentation of fever, purulent wound drainage, and a 'clicking' sternum 12 days post-CABG is highly suspicious for acute postoperative mediastinitis complicated by sternal dehiscence. The standard of care mandates a strict chronological sequence to optimize patient outcomes. First, blood and deep wound cultures must be collected to ensure the causative organism (typically Gram-positive cocci such as Staphylococcus aureus or epidermidis) can be identified. Second, empiric broad-spectrum intravenous antibiotics are administered immediately after cultures to treat the severe systemic infection. Third, a CT scan of the chest is performed to evaluate the mediastinum for fluid collections and the extent of bone involvement, which directly guides the operative plan. Finally, urgent surgical exploration is performed to achieve definitive source control through rigorous debridement of necrotic bone and tissue, followed by stabilization or vascularized muscle flap reconstruction.
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Anahtar Kavram
The management of acute postoperative mediastinitis requires a rapid, standardized sequence: obtain cultures, initiate broad-spectrum antibiotics, obtain cross-sectional imaging for operative planning, and perform definitive surgical debridement.