A stress test was performed before and after by-pass grafts in 83 patients. Post-operatively, the number of painful stress tests fell from 68 to 28. Whatever the initial clinical picture (stable angina, anterior or inferior infarct), the improvements is significantly better when all of the lesions have been by-passed. Furthermores, there was no significant change in the maximal performance, but the appearance of pain occurred at much higher values, reflecting the improvement in coronary perfusion and the displacement of the point of appearance of ischaemia.
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