Occurring at the wrong time; out of sync or mistimed, especially in biological or physiological processes.
From Greek dys- (bad) + chronos (time) + -ous (adjective suffix), a scientific term describing temporal misalignment or poor timing.
A dyschronous heartbeat is an arrhythmia where the heart's chambers don't beat in proper sequence—they're trying to pump blood at the wrong times, which is why it causes chest pain and shortness of breath.
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