Journal of Medicine and Life Science

Institute for Medical Science (제주대학교 의과학연구소)
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Comparison of the Korean Activity Status Index with cardiopulmonary exercise test in patients with acute myocardial infarction

  • Youn Ji Kim (Department of Rehabilitation Medicine, Jeju National University Hospital, Jeju National University College of Medicine) ;
  • Jun Hwan Choi (Department of Rehabilitation Medicine, Jeju National University Hospital, Jeju National University College of Medicine) ;
  • Bo Ryun Kim (Department of Physical Medicine and Rehabilitation, Korea University Anam Hospital) ;
  • So Young Lee (Department of Rehabilitation Medicine, Jeju National University Hospital, Jeju National University College of Medicine) ;
  • Hyun Jung Lee (Department of Rehabilitation Medicine, Jeju National University Hospital, Jeju National University College of Medicine) ;
  • Song-Yi Kim (Division of Cardiology, Department of Internal Medicine, Jeju National University Hospital, Jeju National University College of Medicine) ;
  • Jae-Geun Lee (Division of Cardiology, Department of Internal Medicine, Jeju National University Hospital, Jeju National University College of Medicine)
  • Received : 2022.03.04
  • Accepted : 2022.06.27
  • Published : 2022.08.31
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Abstract

This study aimed to compare the Korean Activity Status Index (KASI) with the cardiopulmonary exercise test (CPET) among patients with acute myocardial infarction. A total of 2,268 patients (85.4% male; mean age, 59.3±10.2 years; range, 23-90 years) diagnosed with acute myocardial infarction were enrolled in the Regional Center Myocardial Infarction Registry between July 2016 and June 2019. The KASI is a tool used to measure functional capacity by asking patients about their ability to perform specific activities and then scoring their responses. In contrast, CPET is the gold standard for assessing the objective functional capacity in patients undergoing cardiac rehabilitation. Peak oxygen uptake (VO2peak) was used to analyze the correlation. Patients who completed two consecutive KASI and CPET evaluations during their first (KASI_1, VO2peak_1) and second visits (KASI_2, VO2peak_2) for cardiac rehabilitation were included in the study. The mean KASI_1 and KASI_2 scores were 43.3±14.3 and 49.8±13.9, respectively, and the mean VO2peak_1 and VO2peak_2 scores were 25.9±8.0 and 28.5±8.3, respectively. Both the KASI scores were significantly correlated with the measured VO2peak during each visit, with correlation coefficients of 0.385 (P<0.001) and 0.346 (P<0.001), respectively. Moreover, the KASI score and VO2peak had a linear relationship (VO2peak_1=0.22×KASI_1+16.5, P<0.001; VO2peak_2=0.21×KASI_2+18.2,VO2peak_2=0.21×KASI_2+18.2, P<0.001). This study revealed that the KASI is a valid measure for the follow-up evaluation of the functional capacity of patients. These findings suggest that VO2peak can be predicted using the KASI score in patients who do not undergo CPET.

Keywords

Acknowledgement

This work was supported by a research grant from Jeju National University Hospital in 2019.

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