PMC6041817_01
Initial ECG with electric alternans.
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Acute ECG revealed sinus tachycardia, heart rate 125 b.p.m., Q-waves in the first four precordial leads (V1-V4), normal axis (78 degrees), and an electric alternans with borderline low-voltage pattern, consistent with pericardial effusion (Figure 1).
Initial chest x-ray with a left-sided pneumothorax (on the left) and a subsequent chest x-ray after placement of the tube (on the right).
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Acute chest x-ray confirmed tension pneumothorax with mediastinal displacement (Figure 2).