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. 2020 Feb;13(2):e009672.
doi: 10.1161/CIRCIMAGING.119.009672. Epub 2020 Feb 13.

Doppler-Derived Arterial Load Indices Better Reflect Left Ventricular Afterload Than Systolic Blood Pressure in Coarctation of Aorta

Alexander C Egbe  1 , Yogesh N V Reddy  1 , Masaru Obokata  1 , Barry A Borlaug  1
Affiliations

Doppler-Derived Arterial Load Indices Better Reflect Left Ventricular Afterload Than Systolic Blood Pressure in Coarctation of Aorta

Alexander C Egbe et al. Circ Cardiovasc Imaging. 2020 Feb.

Abstract

Background: Patients with vascular stiffening may display increased arterial afterload that is out of proportion to systolic blood pressure (SBP). Since vascular and endothelial dysfunction develop in patients with coarctation of aorta (COA), we hypothesized that for any SBP, patients with mild COA (COA peak velocity <2 m/s) will have a higher arterial afterload and increased left ventricular mass index (LVMI) compared with controls, and that Doppler-derived arterial load indices would be a better predictor of LVMI compared with SBP alone.

Methods: We studied 204 COA patients (age 35±12 y) and 204 matched controls. Doppler-derived arterial afterload was assessed using effective arterial elastance index and total arterial compliance index.

Results: Despite similar SBP, the mild COA group displayed higher arterial afterload as evidenced by a higher elastance index (3.3±0.9 versus 2.9±0.7 mm Hg/mL·m2; P<0.001) and lower total arterial compliance index (0.8±0.3 versus 1.2±0.5 mL/mm Hg·m2; P<0.001). This was associated with higher LVMI in COA (109±35 versus 93±32, g/m2; P<0.001). Compared with SBP (β=0.24 [95% CI, 0.02-0.45]), elastance index (β=20.2 [95% CI, 15.8-44.1]) and total arterial compliance index (β=-32.5 [95% CI, -43.8 to -123.6]) were better predictors of LVMI. Elastance index (but not SBP) was predictive of longitudinal increases in LVMI (r=0.43, P<0.001).

Conclusions: COA patients had higher arterial afterload compared with controls with similar SBP. In comparison to SBP, Doppler-derived arterial load indices correlate more strongly with LV hypertrophy. These data suggest that SBP may underestimate LV afterload in this population. This has important clinical implications since titration of antihypertensive therapy is currently based on SBP.

Keywords: aorta; aortic coarctation; blood pressure; hypertension; left ventricular hypertrophy.

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Figures

Figure 1:
Figure 1:
Bar graphs comparing the prevalence of LV hypertrophy between COA (red) and controls (black) for every SBP category
Figure 2:
Figure 2:
Box-and-whisker plot comparing effective arterial elastance index (EaI), (A); total arterial compliance index (TACI), (B); and systemic vascular resistance index (SVRI), (C) between patients with COA (red) and controls (black)
Figure 3:
Figure 3:
Linear regression of left ventricular mass index (LVMI) and EaI (A); LVMI and TACI (B); LVMI and SVRI (C); LVMI and systolic blood pressure (SBP), (D)
See this image and copyright information in PMC

Comment in

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