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Why do heart attacks happen at night?

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Why do heart attacks happen at night?

Researchers found that at around 6:30 a.m. the circadian system sends out an increased amount of PAI-1 cells which blocks blood clots from breaking down. The more PAI-1 cells in the blood, the higher the risk for a blood clot that leads to a heart attack

Last updated on 04 Jul 2025

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