1 MCQs in Medicine for NEET PG
A 58-year-old man presents to the emergency department with acute-onset dyspnea and pleuritic chest pain for 2 hours. He returned from a 12-hour flight 3 days ago and has been immobilized with a leg fracture. His vital signs show HR 118/min, RR 24/min, BP 128/82 mmHg, SpO₂ 91% on room air. An ECG is obtained and shows the pattern marked **A** in the diagram. Which of the following best describes the pathophysiological mechanism underlying this ECG finding in acute pulmonary embolism?
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