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Assessing Endothelial Vasodilator Function with the Endo-PAT 2000
Published on: October 15, 2010
Improvement of Cardiovascular Prognostic Value of Endothelial Function Tests by Repeated Measurements
Nobuyuki Masaki1, Yuko Higashimura1, Bonpei Takase1
1Department of Intensive Care Medicine, National Defense Medical College Saitama Japan.
Insights
Monitoring endothelial function using flow-mediated dilation (FMD) and reactive hyperemia index (RHI) helps predict cardiovascular events. Consistently good FMD predicted fewer cardiovascular events, while consistently abnormal RHI predicted higher mortality and heart failure.
Area of Science:
- Cardiovascular Medicine
- Vascular Biology
- Clinical Diagnostics
Background:
- The clinical utility of monitoring endothelial function for predicting cardiovascular events remains incompletely understood.
- Endothelial dysfunction is a key factor in the development of cardiovascular diseases, particularly in patients with diabetes and hypertension.
Purpose of the Study:
- To investigate the predictive value of repeated endothelial function measurements using flow-mediated dilation (FMD) and EndoPAT reactive hyperemia index (RHI) for cardiovascular outcomes.
- To compare the efficacy of FMD and RHI in predicting different types of cardiovascular events.
Main Methods:
- Longitudinal study involving patients with diabetes or hypertension, with periodic measurements of FMD and RHI over 3 years.
- Follow-up for 10 years post-examination to record major cardiovascular events, angina, all-cause mortality, and heart failure hospitalizations.
- Multivariate Cox analysis was used to assess the association between endothelial function parameters and clinical outcomes.
Main Results:
- Patients maintaining consistently high flow-mediated dilation (FMD >7%) showed significantly reduced risk of major cardiovascular events and angina pectoris (HR 0.216).
- Patients with consistently abnormal EndoPAT reactive hyperemia index (RHI <1.67) exhibited significantly higher all-cause mortality (HR 10.794) and heart failure incidence (HR 5.356).
Conclusions:
- Repeated endothelial function measurements enhance predictive accuracy for cardiovascular events.
- Flow-mediated dilation is a better predictor of coronary events, whereas EndoPAT RHI is more effective in predicting heart failure.
Background:
The clinical significance of monitoring endothelial function in predicting cardiovascular events has not yet been fully explored.
Methods And Results:
Patients with diabetes or hypertension were enrolled in this study. Three flow-mediated dilation (FMD) and 2 EndoPAT reactive hyperemia index (RHI) were measured periodically in 3 years at 1.5-year intervals. Patients were followed up for 10 years after the examination period. In the FMD study, 136 patients were classified as those with consistently good endothelial function, as defined by FMD >7% on 3 occasions (n=33), and those without (n=103). In multivariate Cox analysis, patients who maintained high FMD had less thromboembolic major cardiovascular events or angina pectoris (n=24; hazard ratio [HR] 0.216; 95% confidence interval [CI] 0.047-0.985; P=0.048). In the EndoPAT study, 120 patients were classified as those with consistently abnormal endothelial function, as defined by RHI <1.67 on 2 occasions (n=34), and those without (n=86). There were 9 all-cause deaths and 10 hospitalizations for heart failure. Patients with consistent RHI <1.67 had a higher mortality (HR 10.794; 95% CI 1.520-76.629; P=0.017) and incidence of heart failure (HR 5.356; 95% CI 1.301-22.052; P=0.020).
Conclusions:
Repeated measurements improved the predictive performance and revealed differences between FMD and EndoPAT RHI, which were better at predicting coronary events and heart failure, respectively.
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