Palpitations were rapid and irregular beatings of the heart.
In 2268, Dr. Leonard McCoy asked Lieutenant Commander Montgomery Scott if he were experiencing palpitations after exposure to a gas grenade. (TOS: "Spectre of the Gun")
In 2370, Talur asked "Jayden" (Data) if he had experienced palpitations during her examination of him. (TNG: "Thine Own Self")
Soon after, Reginald Barclay believed that the palpitations he was experiencing were a symptom of the Terellian Death Syndrome. (TNG: "Genesis")
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