Key result
Patients with aortic valve stenosis exhibited significantly reduced global longitudinal strain compared to controls (-15.2% vs -19.5%, p<0.001), with the degree of impairment correlating with the extent of left ventricular hypertrophy.
Why the study?
Does global longitudinal strain correlate with left ventricular mass index in patients with moderate to severe aortic stenosis and normal ejection fraction?
Observational (n=81)
No
Does global longitudinal strain correlate with left ventricular mass index in patients with moderate to severe aortic stenosis and normal ejection fraction?
Absolute Event Rate: -15.2% vs -19.5%
p-value: p=<0.001
In patients with moderate to severe aortic stenosis and normal ejection fraction, increased left ventricular mass index correlates with impaired global longitudinal strain, suggesting GLS may help identify early myocardial dysfunction.
GLS may flag early myocardial dysfunction in moderate-severe AS with preserved EF; leaves open its value for risk stratification or intervention timing.
BACKGROUND: Increased muscle mass index of the left ventricle (LVMi) is an independent predictor for the development of symptoms in patients with asymptomatic aortic stenosis (AS). While the onset of clinical symptoms and left ventricular systolic dysfunction determines a poor prognosis, the standard echocardiographic evaluation of LV dysfunction, only based on measurements of the LV ejection fraction (EF), may be insufficient for an early assessment of imminent heart failure. Contrary, 2-dimensional speckle tracking (2DS) seems to be superior in detecting subtle changes in myocardial function. The aim of the study was to assess these LV function deteriorations with global longitudinal strain (GLS) analysis and the relations to LVMi in patients with AS and normal EF. METHODS: 50 patients with moderate to severe AS and 31 controls were enrolled. All patients underwent echocardiography, including 2DS imaging. LVMi measures were performed with magnetic resonance imaging in 38 patients with AS and indexed for body surface area. RESULTS: The total group of patients with AST showed a GLS of -15,2 +/- 3,6% while the control group reached -19,5 +/- 2,7% (p < 0,001). By splitting the group with AS in normal, moderate and severe increased LVMi, the GLS was -17,0 +/- 2,6%, -13,2 +/- 3,8% and -12,4 +/- 2,9%, respectively (p = 0,001), where LVMi and GLS showed a significant correlation (r = 0,6, p < 0,001). CONCLUSIONS: In conclusion, increased LVMi is reflected in abnormalities of GLS and the proportion of GLS impairment depends on the extent of LV hypertrophy. Therefore, simultaneous measurement of LVMi and GLS might be useful to identify patients at high risk for transition into heart failure who would benefit from aortic valve replacement irrespectively of LV EF.
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Dinh et al. (2010) conducted an observational in Aortic valve stenosis with normal ejection fraction (n=81). Aortic valve stenosis and increased left ventricular mass index vs. Healthy controls and normal left ventricular mass index was evaluated on Global longitudinal strain (GLS) (p=<0.001). Patients with aortic valve stenosis exhibited significantly reduced global longitudinal strain compared to controls (-15.2% vs -19.5%, p<0.001), with the degree of impairment correlating with the extent of left ventricular hypertrophy.
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