Heart flutter
A heart flutter was an abnormal rhythm that occurred in the atria or ventricles of the heart. Cordrazine was used to treat the condition. ()

In 2267, Doctor Leonard McCoy diagnosed a reviving Khan Noonien Singh with heart flutter and warned that he could die in seconds if they didn't get him out of his cryogenic stasis. ()

Later that year, Hikaru Sulu was diagnosed with a heart flutter after a technical malfunction on the bridge of the  caused his console to overload and explode in his face. ()

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Medical conditions