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Why the sudden shock after a few days of malaise?

Dr. Smith's ECG Blog

It has been estimated that in the aggregate, they occur at a rate of about 3 per 1000 patients with acute MI, and most of these events occur in patients with STEMI. A mong patients with STEMI, ventricular septal rupture is the most common and free wall rupture is the least common.

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Chest pain followed by 6 days of increasing dyspnea -- what happened?

Dr. Smith's ECG Blog

50% of LAD STEMI have Q-waves by one hour. Smith : In limb leads, the ST vector is towards lead II (STE lead II STE lead III, which is more likely with pericarditis than with STEMI). This correlates with potentially salvageable myocardium. See Raitt et al.: These findings together are more commonly seen with pericarditis.