Abstract
Introduction
Global left ventricular (LV) afterload as assessed by valvulo-arterial impedance (Zva),
may be an independent predictor of mortality in patients with severe aortic stenosis
(AS) and preserved LV ejection fraction (LVEF). However, its quantification using
echocardiography may be subject to error measurement.
We aimed to determine the prevalence and impact on long-term survival of high Zva,
purposely measured by cardiac catheterization.
Methods and results
676 patients with preserved LVEF and severe AS without other valvular heart diseases
underwent cardiac catheterization. Zva was derived from catheterization and calculated
as follows: mean aortic gradient + systolic blood pressure/indexed LV stroke volume. Zva was considered high when >5 mm Hg/mL/m2 based on previous studies.
Overall, high Zva was found in 42% of all AS patients. Four-year survival and 8-year
survival were significantly reduced in patients with high Zva (74 ± 3% and 57 ± 4%) as compared to those with low Zva (85 ± 2% and 74 ± 3%; p = 0.002). After adjustment for all other risk factors, Zva was independently associated
with reduced long-term survival (hazard ratio [HR] = 1.47 95% CI: 1.04–2.09; p = 0.029). Of interest, high Zva remained associated with reduced survival as compared
to low Zva, in patients with normal LV stroke volume, but was no longer significant
in low flow patients (p = 0.98).
Conclusion
High Zva, estimated invasively in our study, is frequent in patients with severe AS,
and appears as a robust and independent predictor of survival. Zva should be used
as an additional parameter for risk stratification of severe AS, more particularly
in patients with normal flow.
Keywords
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Article info
Publication history
Published online: November 26, 2014
Accepted:
November 23,
2014
Received:
October 8,
2014
Identification
Copyright
© 2014 Elsevier Ireland Ltd. Published by Elsevier Inc. All rights reserved.
