Clinical Assessment and Significance of Left Atrium Function in Primary Hypertension
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Abstract:
The full left atrium function is essential to maintain the left ventricular force in hypertension patients.The left atrium is involved in three functions: conserving,piping and sub-pumping.Hypertension tends to increase left atrial volume and systolic pumping but decrease its passive emptying.Age,left ventricular mass index,left ventricular remodelling and the left atrial prosystolic volume index are important factors which influence the left atrial ejection fraction.This article assesses left atrial function,which can lead to earlier diagnosis of left ventricular dysfunction.Keywords:
Atrium (architecture)
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prevalence of diastolic dysfunctionwas 59% (n=71) in keeping with our findings using the Canadian consensusguidelines.Conclusions: Our findings question the reliability of commonly used echocardiographic criteria to diagnose diastolic dysfunction in early hypertension.Assessment of diastolic function should be based on a comprehensive echocardiographic study integrating all available data including tissue Doppler imaging which may alleviating the need to unmask a pseudo normal pattern with the valsalva manoeuvre.
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Ventricular Function
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Ventricular Function
Left behind
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Systole
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Left Ventricular Thrombus
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Objective:The present study is designed to investigate the relationship between the left atrium construction and hypertension.Methods:282 patients with hypertension and 100 healthy controls were studied by echocardiography.Results:The results showed that significant correlations were found between increased left atrium space (LAS) and duration of hypertension.Conclusion:The results suggest that left atrium enlargement is one of the earlier signs of hypertension and the change of LAS might be helpful to evaluate the disorder of left ventricular diastolic function.
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Left atrial enlargement
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Arterial hypertension determines distinct adaptive left ventricular geometric responses, which may differently affect left ventricular function and left atrial performance.In this study, the effect of left ventricular geometry on left atrial size and function, and the relationship between left atrial size and left ventricular mass were assessed in 336 patients with systemic arterial hypertension who had undergone Doppler echocardiography.Patients were classified into concentric (110 patients with concentric left ventricular geometry defined as relative wall thickness > or = 0.44) and eccentric groups (226 patients with relative wall thickness < 0.44). Comparison to the latter, the former had greater left atrial size, left atrial ejection force, left ventricular mass and lower left ventricular midwall fractional shortening. Left ventricular concentric, rather than eccentric, geometry emerged by multivariate analysis as a factor independently associated with the highest degree of left atrial ejection force. Left atrial size was positively related to left ventricular mass in the whole population (r = 0.65, SEE = 6 ml, P < 0.00001). This relationship was maintained in the subgroups with concentric (r = 0.65, SEE = 6 ml, P < 0.00001) or eccentric geometry (r = 0.59, SEE = 6 ml, P < 0.00001).Our results indicate that the relationship of left ventricular geometry to both left atrial size and ejection force in hypertensive patients is relevant. Concentric left ventricular geometry is associated with greater left atrial size and ejection force than eccentric geometry, suggesting that increased left ventricular stiffness has a greater effect in stimulating left atrial performance than left ventricular end-systolic stress. The degree of left atrial enlargement similarly depends on left ventricular mass in patients with concentric and eccentric geometry.
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Left atrial enlargement
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