Key result
In patients with continuous-flow LVADs, heart rate reserve strongly correlated with V˙O2 reserve (R=0.75), serving as a good predictor of exercise intensity in unpaced patients.
Why the study?
Does heart rate reserve (%HRR) accurately predict percentage of V˙O2 reserve (%V˙O2R) during exercise in patients with continuous-flow LVAD?
Population
24 patients with continuous-flow left ventricular assist device (LVAD), including 7 females.
Design
Cross-sectional
Authors
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Supports %HRR-guided exercise in nonpaced LVAD patients; leaves open prospective outcome trials before practice change.
Observational (n=24)
Does heart rate reserve (%HRR) accurately predict percentage of V˙O2 reserve (%V˙O2R) during exercise in patients with continuous-flow LVAD?
Effect estimate: R = 0.75
p-value: p=0.002
In non-paced LVAD patients, %HRR is a good predictor of %V˙O2R, while RPE is a suitable surrogate measure of exercise intensity for paced patients.
Kerrigan et al. (2015) conducted an observational in Continuous-flow left ventricular assist device (LVAD) (n=24). Surrogate markers of exercise intensity (%HRR, Borg RPE, LVAD flow) was evaluated on Association between percentage of heart rate reserve (%HRR) and percentage of V˙O2 reserve (%V˙O2R) (R = 0.75, p=0.002). In patients with continuous-flow LVADs, heart rate reserve strongly correlated with V˙O2 reserve (R=0.75), serving as a good predictor of exercise intensity in unpaced patients.
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