1 MCQs in Medicine for NEET PG
A 58-year-old man with metastatic lung cancer presents with acute dyspnea, hypotension (BP 88/56 mmHg), and elevated JVD. An ECG is obtained showing low-voltage QRS complexes across all leads. The structure marked **B** in the diagram demonstrates beat-to-beat variation in QRS amplitude. Which of the following best explains the mechanism underlying this ECG finding?
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