For the past two years, Jorge Gonzalez, 46, had done all kinds of things to improve his health.

He lost 60 pounds. He trained to run a 5K race. He focused on his health in matters big and small.

So imagine his bafflement when, one day at work, he suddenly began to feel particularly unwell. Even his colleague noticed it.

Gonzalez himself had to admit—the pounding in his chest couldn’t be ignored.

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