A 58-year-old man undergoes elective CABG for triple-vessel disease. On postoperative day 1, he develops hypotension (BP 88/52 mmHg), tachycardia (HR 118/min), and rising CVP (14 cmH₂O). Chest tube output was 280 mL/h for 3 hours, then suddenly decreased to 20 mL/h. CT chest shows the structure marked **A** as a hyperdense fluid collection (55 HU) with compression of the right atrium and right ventricle. Bedside echocardiography is technically limited due to post-sternotomy acoustic windows. Which of the following is the MOST appropriate next step in management?
A. Initiate high-dose tranexamic acid and aggressive FFP transfusion
B. Perform pericardiocentesis under fluoroscopic guidance
C. Immediate surgical re-exploration and mediastinal evacuation
D. Administer protamine 50 mg IV and observe for 2 hours
Explanation
Why "Immediate surgical re-exploration and mediastinal evacuation" is right
The clinical presentation meets multiple CRITICAL indications for re-exploration per STS 2023 CABG Guidelines: (1) hemodynamic instability (hypotension, elevated CVP, tachycardia) despite resuscitation, (2) cessation of previously brisk drainage (280 mL/h → 20 mL/h) suggesting chest tube obstruction with retained blood, and (3) imaging evidence of expanding hematoma (marked A) with compression of cardiac chambers indicating tamponade physiology. The hyperdense collection (55 HU) and RV/RA compression on CT are pathognomonic for post-CABG mediastinal hematoma with hemodynamic compromise. Even though echocardiography windows are poor, the combination of clinical instability + imaging + drainage cessation mandates urgent surgical intervention within 12 hours for optimal outcomes. Surgical re-exploration identifies the bleeding source (anastomotic leak, IMA bed, sternal wires) in 50–60% of cases.
Why each distractor is wrong
Administer protamine 50 mg IV and observe for 2 hours: While protamine reversal of residual heparin is part of pre-operative coagulopathy correction, it is NOT a substitute for surgical intervention in a hemodynamically unstable patient with tamponade physiology and imaging-confirmed hematoma. Observation delays definitive treatment and risks cardiac arrest.
Perform pericardiocentesis under fluoroscopic guidance: Pericardiocentesis is not standard management for post-CABG mediastinal hematoma because: (a) the collection is in the mediastinum, not purely pericardial; (b) post-sternotomy anatomy makes safe needle access difficult; (c) it does not address the bleeding source; (d) it may miss clotted blood that won't drain. Surgical evacuation is definitive.
Initiate high-dose tranexamic acid and aggressive FFP transfusion: Tranexamic acid and FFP are adjuncts for coagulopathy correction in the operating room or ICU, not primary management of hemodynamic instability from a retained hematoma with tamponade. Medical management alone will not resolve the mechanical obstruction or identify the bleeding source.
High-YieldNEET PG
Post-CABG mediastinal hematoma with hemodynamic instability, cessation of chest tube drainage, and imaging confirmation = URGENT SURGICAL RE-EXPLORATION (not observation, not pericardiocentesis, not medical management alone).
STS 2023 CABG Guidelines; post-cardiac surgery bleeding and tamponade physiology
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