The association between O₂-pulse slope ratio and functional severity of coronary stenosis: A combined cardiopulmonary exercise testing and quantitative flow ratio study.

Patients within the μQFR ≤ 0.8 group showed a trend towards lower peak VO 2 /kg of predicted value; however, this difference was not statistically significant compared to those in the μQFR > 0.8 group (70.14 ± 12.72 % vs. 75.27 ± 14.32 %, p = 0.086).

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