Paramedics were racing a 59-year-old man to the hospital.
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He had a dangerously rapid heartbeat of 200 beats per minute.
When the ambulance hit a pothole, medics said the man's heartbeat suddenly returned to normal.
Doctors say this is rare, but it can happen.
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"One way to treat that is with an electrical shock. Classically, you'll see it on television. The paddles... Clear... And a big jolt. Turns out, you can do that with a pothole," one doctor said.
The man is expected to fully recover.
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