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?
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