Usefulness of the Valvuloarterial Impedance to Predict Adverse Outcome in Asymptomatic Aortic Stenosis
Zeineb Hachicha, MD,
Jean G. Dumesnil, MD* and
Philippe Pibarot, DVM, PhD*
Institut Universitaire de Cardiologie et de Pneumologie de Québec/Québec Heart and Lung Institute, Department of Medicine, Laval University, Québec City, Québec, Canada
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Figure 1 Distribution of Stenosis Severity and Paradoxical Low-Flow Pattern Versus Zva
Percentage of patients with moderate versus severe aortic stenosis (AS) (A) and with normal flow (NF) versus paradoxical low flow (PLF) (B) according to the level of valvuloarterial impedance (Zva) (low Zva  3.5, moderate 3.5 <Zva <4.5, high Zva  4.5). The numbers in the bars are percentages.
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Figure 2 Overall Survival Versus Zva
Overall survival as a function of the level of valvuloarterial impedance (Zva) (low Zva 3.5 [green line], moderate 3.5 < Zva <4.5 [blue line], high Zva 4.5 [red line]). Survival was compared with that in the general population in Quebec matched for age and sex (control group; black line).
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Figure 3 Overall Survival Versus Zva and Type of Treatment
Overall survival as a function of the level of valvuloarterial impedance (Zva) (low Zva 3.5 [green lines], moderate 3.5 < Zva <4.5 [blue lines], high Zva 4.5 [red lines]) and the type of treatment: medical (solid lines) versus surgical (dashed lines). Survival was compared with that in the general population in Quebec matched for age and sex (control group; black line).
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