高血圧症性心疾患患者運動負荷心電図の一観察例

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安静時心電図所見において心室性期外収縮と心筋傷害が認められる59才の男性の運動負荷中並びに回復過程の心電図変化について検討した。結果の概要は次のごとくであった。1)心拍数140/分に達する程度の負荷であったが,運動終了直後の回復が対照に比して遅かった。2)QTT間隔は運動中に約0.05秒程度の短縮を示し,時間経過にともなう変動は対照と同様であった。3)補正QTT間隔は0.35秒前後で対照の0.32秒前後よりも大であった。このことはR-R間隔にしめる弛緩期の割合が小であり、運動に適応しにくいことを示している。4)STは安静時の0.1mV降下が運動中には最大0.25mVまで降下した。また、回復期にも一時的に0.2mV程度の降下を示す時期があった。5)T波高が運動中に増高したが、対照では低下した。6)期外収縮は運動中にほとんど消失した。しかし、回復期には一時的に頻発した。The electrocardiogram of a 59-year-old male who had ventricular premature beats and coronary insufficiency electrocardiographically at rest was recorded during exercise and recovery course with a telemetered radioelectrocardiograph. The results are as follows: 1) The maximum heart rate as a work load is about 140 beats per minute. The decrease in heart rate just after the exercise is slow in comparison with controls. 2) The QTT intervals (from the onset of Q wave to the top of T wave) are shortened about 0.05 seconds during exercise. The changes in the QTT interval are similar to controls. 3) The corrective QTT intervals 〔QTTc=(QTT interval (in second))/(√<R-R interval (in secpnd)>)〕 are about 0.35 seconds throughout experiment. They are longer than controls of about 0.32 seconds. This indicates that the relaxation time in a R-R interval is relatively shorter and that the subject is hard to adapt for exercise. 4) The ST segments which have been depressed by 0.1 mV at rest are depressed by a maximum of 0.25 mV during exercise. They are depressed by 0.2 mV temporarily in the recovery course. 5) The T waves become tall during exercise, while those of controls become flat. 6) The ventricular premature beats which have been observed four times per minute at rest almost disappears during exercise. However, temporarily in the recovery course they appears more frequently than at rest.
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高血圧症性心疾患患者運動負荷心電図の一観察例

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