Highlights
- •Low-load exercise stress echocardiography is useful for heart failure patients.
- •Assessing right ventricular function during low-load exercise is important.
- •Right ventricular contractile reserve predicts heart failure readmission.
Abstract
Background
Exercise intolerance in patients with heart failure (HF) increases HF-associated readmission,
and right ventricular (RV) contractile reserve assessed by low-load exercise stress
echocardiography (ESE) is associated with exercise intolerance. This study investigated
the impact of RV contractile reserve evaluated by low-load ESE on HF readmission.
Methods
We prospectively examined 81 consecutive patients hospitalized for HF who underwent
low-load ESE under a stabilized HF condition between May 2018 and September 2020.
We performed a 25-W low-load ESE and defined RV contractile reserve as the increment
in RV systolic velocity (RV s′). The primary outcome was hospital readmission. Incremental
values of the change in RV s′ over a readmission risk (RR) score were analyzed using
the receiver operating characteristic (ROC) area under the curve; internal validation
using bootstrapping was performed. The association between RV contractile reserve
and HF readmission was illustrated with the Kaplan-Meier curve.
Results
Eighteen (22 %) patients were readmitted due to worsening HF during the observation
period (median 15.6 months). The cut-off value of 0.68 cm/s for the change in RV s′
to predict HF readmission with the ROC curve analysis indicated good sensitivity (100 %)
and specificity (76.2 %). The discriminatory ability for HF readmission was significantly
improved by adding the change in RV s′ to the RR score (p = 0.006), and the c-statistic using the bootstrap method was 0.92. The cumulative
survival rate free of HF readmission was significantly lower in patients with reduced-RV
contractile reserve (log-rank test, p < 0.001).
Conclusions
The change in RV s′ during low-load exercise had an incremental prognostic value for
predicting HF readmission. The results demonstrated the loss of RV contractile reserve
assessed by low-load ESE was associated with HF readmission.
Graphical abstract

Graphical Abstract
Keywords
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Article info
Publication history
Published online: March 17, 2023
Accepted:
February 17,
2023
Received in revised form:
February 13,
2023
Received:
December 9,
2022
Publication stage
In Press Corrected ProofIdentification
Copyright
© 2023 Japanese College of Cardiology. Published by Elsevier Ltd. All rights reserved.