Volume 48, Issue 2 pp. 166-174
MAIN TEXT

Depressive symptoms, right ventricular function, and muscular strength are associated with peak oxygen uptake in patients with implantable left ventricular assist devices

Kazufumi Kitagaki

Corresponding Author

Kazufumi Kitagaki

Faculty of Rehabilitation, Shijonawate Gakuen University, Daito, Japan

Department of Cardiovascular Rehabilitation, National Cerebral and Cardiovascular Center, Suita, Japan

Correspondence

Kazufumi Kitagaki, Faculty of Rehabilitation, Shijonawate Gakuen University, 5-11-10 Houjou Daito 574-0011, Osaka, Japan.

Email: [email protected]

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Tatsuo Aoki

Tatsuo Aoki

Department of Cardiovascular Rehabilitation, National Cerebral and Cardiovascular Center, Suita, Japan

Department of Cardiovascular Medicine, National Cerebral and Cardiovascular Center, Suita, Japan

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Hiroyuki Miura

Hiroyuki Miura

Department of Cardiovascular Rehabilitation, National Cerebral and Cardiovascular Center, Suita, Japan

Department of Cardiovascular Medicine, National Cerebral and Cardiovascular Center, Suita, Japan

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Yukihiro Shimada

Yukihiro Shimada

Department of Cardiovascular Rehabilitation, National Cerebral and Cardiovascular Center, Suita, Japan

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Harumi Konishi

Harumi Konishi

Department of Nursing, National Cerebral and Cardiovascular Center, Suita, Japan

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Yasumasa Tsukamoto

Yasumasa Tsukamoto

Department of Transplant Medicine, National Cerebral and Cardiovascular Center, Suita, Japan

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Teruo Noguchi

Teruo Noguchi

Department of Cardiovascular Medicine, National Cerebral and Cardiovascular Center, Suita, Japan

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First published: 03 November 2023

Abstract

Background

Left ventricular assist device (LVAD) implantation is among the most effective treatment options for patients with severe heart failure. Although previous studies have examined the factors related to peak oxygen uptake (peak VO2), they were limited by the few patients involved and their focus on medical and physical functions. Therefore, this study comprehensively examined the factors associated with peak VO2, which is an important prognostic factor in patients with implantable LVADs.

Methods

Eighty-nine patients who underwent initial LVAD implantation and were eligible for cardiopulmonary exercise testing (CPX) between May 2014 and September 2021 were included. The patients' mean age was 48 ± 12 years, and 70% were males. Based on previous studies, the cut-off was set at 12 and 14 mL/kg/min for patients taking β-blocker and those not taking β-blockers, respectively. Furthermore, factors associated with peak VO2 were examined using multivariate logistic regression analysis.

Results

The mean time from surgery to CPX administration was 73 ± 40 days. The high group had a higher cardiac index, right ventricular stroke work index (RVSWI), and isometric knee extensor muscular strength and lower Patient Health Questionnaire-9 (PHQ-9) and B-type natriuretic peptide values than the low group. Multivariate logistic regression analysis showed that RVSWI and KEMS were positively correlated, whereas PHQ-9 was negatively associated with peak VO2.

Conclusion

Right ventricular function, depressive symptoms, and lower limb muscular strength were associated with exercise capacity in patients with implantable LVADs.

CONFLICT OF INTEREST STATEMENT

The authors have no financial conflicts of interest to disclose concerning the study.

DATA AVAILABILITY STATEMENT

The data generated and/or analyzed during this research are available from the corresponding author upon reasonable request.

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