Two patients (aged 46 and 49 years) are presented who gave a history of several years' duration of unsteadiness, dizziness, and syncopal attacks on standing. Both had orthostatic hypotension which was associated with the development of a unifocal paroxysmal ventricular tachycardia. There was no evidence of organic heart disease. In one of the patients the symptoms usually developed when standing after working in a crouched position. He responded to treatment with beta-adrenergic blockade. The other patient developed her symptoms on standing, after exercise or other stress. The paroxysmal ventricular tachycardia, which occurred in the upright position only, was accompanied by a marked rise in plasma adrenaline. In this patient one contributory factor was a low blood volume and she responded to plasma volume expansion. We wish to draw attention to the common neurological symptoms with which paroxysmal ventricular tachycardia may present. We suggest that paroxysmal ventricular tachycardia may result from ventricular sensitivity to circulating adrenaline and not due to aberrant innervation of the heart as has been suggested previously.
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