P187 IN SEVERE AORTIC STENOSIS, DECREASED SYSTEMIC VASCULAR RESISTANCE IS ASSOCIATED WITH A LARGER, THICKER WALLED VENTRICLE EXCEPT FOR THE SEPTUM
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- 10.1016/j.artres.2017.10.188How to use a DOI?
- Abstract
Background: The ventricle in aortic stenosis (AS) is influenced by both valvular and vascular factors. The importance of afterload on left ventricular (LV) remodeling is not completely understood. Traditional imaging techniques which rely on geometric assumptions may not assess regional remodeling accurately.
Aim: To understand the influence of systemic vascular resistance (SVR), systemic arterial compliance (SAC), valvulo-arterial impedance (Zva) on LV remodeling using a cardiac atlas technique.
Methods: 109 patients with symptomatic severe AS awaiting surgical valve replacement (age 69±10y, 60% male, aortic valve area 0.7±0.3cm2, mean gradient 48±15 mmHg) underwent comprehensive clinical, echocardiographic and cardiovascular magnetic resonance (CMR) examinations. SVR, SAC and Zva were calculated as previously published (1). CMR LV short axis steady-state free precession cine images were segmented and co-registered using a cardiac atlas technique (2). Data were extracted and analysed using mass-univariate 3D regression modeling adjusted for age, sex, and height and accounting for multiple testing, presented as standardized ß.
Results: Lower SVR correlated with increased wall thickness and larger cavity volume. SVR related changes were more prominent in the lateral wall (ß −0.3 to −0.6, p = 0.04), with no discernable influence on the septum (Figure 1). With lower SVR, LV cavity enlargement was directed away from the septum (ß −0.17 to −0.56, p = 0.002). There was no influence of SAC or Zva on 3D parameters.
Conclusion: In severe AS there is an association between lower SVR and a larger, thicker walled ventricle except for the septum. The use of a cardiac atlas in aortic stenosis may offer new insights into regional LV remodeling.
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TY - JOUR AU - Anish Bhuva AU - Thomas Treibel AU - Georgia Doumou AU - Antonio De Marvao AU - Carlo Biffi AU - Timothy Dawes AU - Siana Jones AU - Declan O’Regan AU - James Moon AU - Alun Hughes AU - Charlotte Manisty PY - 2017 DA - 2017/12/06 TI - P187 IN SEVERE AORTIC STENOSIS, DECREASED SYSTEMIC VASCULAR RESISTANCE IS ASSOCIATED WITH A LARGER, THICKER WALLED VENTRICLE EXCEPT FOR THE SEPTUM JO - Artery Research SP - 107 EP - 107 VL - 20 IS - C SN - 1876-4401 UR - https://doi.org/10.1016/j.artres.2017.10.188 DO - 10.1016/j.artres.2017.10.188 ID - Bhuva2017 ER -