Key result
LA conduit strain differentiates MS from MR with ~82% diagnostic accuracy.
Why the study?
LA strain analysis is an emerging technique, but comparisons of LA strain parameters between mitral stenosis and mitral regurgitation to identify discriminators were needed.
Do left atrial strain parameters accurately differentiate between mitral stenosis and mitral regurgitation in patients with normal LVEF?
Cross-Sectional (n=88)
Blinded analysis of echocardiographic parameters
No
Do left atrial strain parameters accurately differentiate between mitral stenosis and mitral regurgitation in patients with normal LVEF?
Effect estimate: AUC 0.815 (95% CI 0.720-0.910)
Absolute Event Rate: -5.43% vs -12.97%
p-value: p=<0.001
Left atrial conduit strain (LAstrainCD) is a highly accurate echocardiographic parameter for differentiating mitral stenosis from mitral regurgitation, reflecting distinct atrial remodeling patterns in response to pressure versus volume overload.
May aid MS-MR differentiation by LA conduit strain in normal LVEF; leaves open prospective validation before adoption.
BACKGROUND: Left atrial (LA) strain analysis is an emerging echocardiographic technique for assessing LA function. This study aimed to compare LA strain parameters in patients with mitral stenosis (MS) and mitral regurgitation (MR) to identify discriminators between these conditions. METHODS: This cross-sectional study included 44 patients with moderate-to-severe MR and 44 patients with severe-to-very severe MS, all with normal left ventricular ejection fraction. Patients with left ventricular systolic dysfunction, ischemic mitral regurgitation, or atrial fibrillation were excluded. Clinical data were collected, and LA strain analysis was performed offline using EchoPAC software. The study analyzed LA reservoir, conduit, and contractile strain components.LAstrainSR, LAstrainCD and LAstrainCT were derived and analyzed for their diagnostic performance. Data were analyzed using SPSS version 26.0, with one-way ANOVA used to compare LA strain parameters between groups. RESULTS: LAstrainCD demonstrated the highest diagnostic accuracy (81.8%) for differentiating MS from MR, making it the most reliable strain parameter. LAstrainCT showed the best performance for assessing MR severity, with a moderate accuracy of 61.5%. CONCLUSION: This study elucidates the distinct impacts of mitral stenosis and regurgitation on left atrial function, as reflected by LA strain parameters. LAstrainCD emerges as a key discriminator between these conditions, highlighting differences in atrial remodeling due to pressure and volume overload. Furthermore, LAstrainCT's correlation with MR severity enhances our understanding of atrial adaptation to regurgitant volume. These findings advance the knowledge of mitral valve disease pathophysiology, providing a foundation for improved diagnostic and therapeutic strategies.
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Bayat et al. (2026) conducted a cross-sectional in Mitral stenosis and mitral regurgitation (n=88). Mitral stenosis vs. Mitral regurgitation was evaluated on Left atrial conduit strain (LAstrainCD) for differentiating MS from MR (AUC 0.815, 95% CI 0.720-0.910, p=<0.001). Left atrial conduit strain (LAstrainCD) demonstrated the highest diagnostic accuracy (81.8%, AUC 0.815) for differentiating mitral stenosis from mitral regurgitation.
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