Abnormal paroxysmal rapidity of cardiac action. The pulse may rise as high as 200 per minute. It is a comparatively rare affection, due to paralysis of the inhibitory nerve of the heart or to stimulation of the cardiac accelerator nerves. T., Essential Paroxysmal, tachycardia occurring in paroxysms and due to functional disturbance of the cardiac nerves. T., Paroxysmal, tachycardia occumug periodically in paroxysms. T. strumosa exophthal- mica. See Exophthalmic Goiter.
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