tachycardia

noun

Etymology: Learned borrowing from New Latin tachycardia, from Ancient Greek ταχύς (takhús, “swift”) + καρδία (kardía, “heart”). By surface analysis, tachy- + -cardia. Compare French tachycardie.

1. A rapid resting heart rate, especially one above 100 beats per minute; palpitations.

   “The heart becomes irritable, there is nervous palpitation, or attacks of paroxysmal tachycardia.”

   “Tachycardias of all types reduce the cardiac output if the rate is high enough. […] The main difference between the tachycardias as regards the reduction of cardiac output is the rate at which they cause a significant reduction of cardiac output, and this depends on the type of tachycardia.”