Left atrial minimum volume and reservoir function as correlates of left ventricular diastolic function: impact of left ventricular systolic function
Open Access
- 29 April 2012
- Vol. 98 (10), 813-820
- https://doi.org/10.1136/heartjnl-2011-301388
Abstract
Objective Left atrial (LA) maximum volume (LAVmax) is an indicator of left ventricular (LV) diastolic function. However, LAVmax is also influenced by systolic events, whereas the LA minimum volume (LAVmin) is directly exposed to LV pressure. The authors hypothesised that LAVmin may be a better correlate of LV diastolic function than LAVmax. Design Cross-sectional. Setting University hospital. Patients 357 participants from a community-based cohort study. Methods LA volumes and reservoir function, measured as total LA emptying volume (LAEV) and LA emptying fraction (LAEF), were assessed by real-time three-dimensional echocardiography. LV diastolic function was assessed by trans-mitral early (E) and late (A) Doppler velocities and mitral early diastolic velocity by tissue-Doppler (e'). LV systolic function was assessed by LV ejection fraction (LVEF) and global longitudinal strain (GLS) by speckle-tracking. Results LAVmin significantly increased with worsening diastolic dysfunction (pmax was less pronounced (p=0.07). LAEV and LAEF decreased with worsening diastolic dysfunction (both pmin and LAVmax were significant predictors of E/e', with higher parameter estimates for LAVmin. In multivariate models, LAVmin resulted strongly associated with E/e' (β=0.45, pmax was not (β=−0.16, p=0.08). LA reservoir function was better associated with GLS than LVEF. In multivariate analyses, GLS was significantly associated with LAVmax (β=−0.15, p=0.002), LAEV (β=−0.37, pmin. Conclusions LAVmin is a better correlate of LV diastolic function than LAVmax. The impact of LV longitudinal systolic function on LA reservoir function might explain the weaker relation between LAVmax and LV diastolic function.Keywords
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