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Diagnosis of Vasospastic Angina by Analysis of Heart Rate Response to Exercise: Effects of Different Levels of Work Load

From the Research Institute and Department of Medicine, National Cardiovascular Center, Suita, Osaka, Japan

Yasuhiro Hasegawa, M.D.

From the Department of Physiology, Nagoya City University, Nagoya, Japan

Tohru Ohe, M.D.

From the Research Institute and Department of Medicine, National Cardiovascular Center, Suita, Osaka, Japan

Tohru Funahashi, M.D.

Research Institute and Department of Medicine, National Cardiovascular Center, Suita, Osaka, Japan

Yoshiaki Tomobuchi, M.D.

Research Institute and Department of Medicine, National Cardiovascular Center, Suita, Osaka, Japan

Katsuro Shimomura, M.D.

Research Institute and Department of Medicine, National Cardiovascular Center, Suita, Osaka, Japan

To examine alterations in control function of the heart, which may account for the pathophysiologic condition precipitating coronary arterial spasm, heart rate response to exercise in vasospastic angina was evaluated by using our previously developed method of frequency analysis. We also examined the effects of three different levels of work load on the heart rate response to treadmill exercise in 9 patients with vasospastic angina and 7 normal controls: stage 1 (2.5 Km/h, 10%), stage 3 (4.5 Km/h, 10%), and stage 5 (5.5 Km/h, 14%). The transfer function of heart rate control in vasospastic angina was characteristically different from that in normal controls: lower gain and more delayed phase angle of the system. Although this abnormality was observed in every test at 3 different levels of work load, the abnormality was more striking in tests at lower levels of work load: stage 1 or 3. The moderately light exercise test at stage 3 is most suitable as a test for detecting abnormal heart rate response to exercise in vasospastic angina because the exercise test at stage 1 had a poor S/N ratio.

Angiology, Vol. 36, No. 1, 9-18 (1985)
DOI: 10.1177/000331978503600102


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