Fyfe T, Robinson J F
Br Heart J. 1986 Oct;56(4):391-3. doi: 10.1136/hrt.56.4.391.
A 74 year old man with a Quintech Tx pacemaker experienced a reduction in his exercise capacity because his heart rate failed to increase with effort. This was shown to be caused by the failure of the interval between the delivered stimulus and evoked T wave to decrease during effort where previously it had done so. Although the stimulus-T interval did not change during exercise, it did decrease in response to isoprenaline infusion and in response to pacing the heart at increasing rates. Catecholamine concentrations increased during exercise and the patient had normal thyroid function.
一名植入Quintech Tx起搏器的74岁男性，其运动能力下降，原因是心率无法随运动而增加。研究表明，这是由于运动时起搏脉冲与诱发T波之间的间期未能像之前那样缩短。尽管运动期间刺激-T间期未改变，但静脉输注异丙肾上腺素及以递增频率起搏心脏时，该间期缩短。运动期间儿茶酚胺浓度升高，且患者甲状腺功能正常。
