Left atrium reservoir function is central in patients with rheumatic mitral stenosis

Comparative assessment of left and right atrial deformation using 2D and 3D speckle-tracking echocardiography in healthy individuals and rheumatic mitral stenosis patients with/without atrial fibrillation

BACKGROUND

Rheumatic mitral stenosis continues to be a significant public health issue in developing countries. Advances in echocardiography have made it possible to non-invasively assess atrial physiomechanics. In our study, we aimed to evaluate the changes in left and right atrial phasic functions in patients with have mitral stenosis and to investigate the relationship of these changes with clinical signs, symptoms, and intervention decisions.

METHODS

Patients with rheumatic mitral stenosis who did not have comorbidities affecting cardiac function were included in this single-center, prospective study. The study population consisted of 122 subjects: 30 healthy controls with no chronic diseases and normal cardiac function confirmed by clinical and echocardiographic evaluations, 31 patients with moderate mitral stenosis, 31 patients with severe mitral stenosis and 30 patients with severe mitral stenosis with valvular atrial fibrillation. In addition to conventional echocardiographic parameters, biventricular deformation analyses were assessed using 2D-STE. Right and left atrial phasic functions were evaluated using both 2D and 3D-STE analysis and compared with clinical findings.

RESULTS

In the patient group with severe mitral stenosis in sinus rhythm, the contractile left atrial strain values were significantly higher. The left atrial peak longitudinal (reservoir) strain values were found to be significantly lowest in the group with severe mitral stenosis accompanied by atrial fibrillation. Similarly, in the group with severe mitral stenosis accompanied by atrial fibrillation, the right atrial phasic strain values were significantly lower in both 2D and 3D measurements.

CONCLUSION

Mitral stenosis, the increased left atrial afterload in patients with sinus rhythm is compensated by an increase in contractile function. However, this compensatory increase is insufficient to preserve left atrial reservoir function. Patients with mitral stenosis who develop atrial fibrillation lack the compensatory contractile function, and this deficiency underlies the increased clinical deterioration associated with the development of atrial fibrillation.

Ultrasound assessment of the association between left atrial remodeling and fibrosis in patients with valvular atrial fibrillation: a clinical investigation

BACKGROUND

Advanced heart failure in patients with valvular atrial fibrillation (VAF) poses a significant threat to human health. Noninvasive assessment of left atrial remodeling in various pathological conditions is instrumental in guiding clinical treatment decisions, evaluating efficacy, and predicting prognosis.

METHODS

The study enrolled 63 patients diagnosed with mitral stenosis (MS), among whom 44 presented concomitant atrial fibrillation (AF) and 19 had sinus rhythm. Left atrial volume and functional parameters were evaluated using real-time three-dimensional echocardiography (RT-3DE) and two-dimensional speckle tracking imaging (2D-STI) techniques, while left atrial stiffness index (LASI) was calculated accordingly. During surgery, left atrial myocardial specimens were obtained to determine the CVF through histopathological evaluation, reflecting the extent of left atrial myocardial fibrosis. Comparative analysis was conducted between the AF group and the control group regarding left atrial volume, functional parameters, LASI, as well as their correlation with CVF.

RESULTS

(1) Patients with MS combined with AF exhibit larger left atrial volume, decreased strain at all stages, reduced function, and increased stiffness of the left atrium compared to patients in sinus rhythm. (2) LASI was positively correlated with CVF in both the control and AF groups, exhibiting the highest correlation coefficient (p < 0.05).

CONCLUSION

The application of RT-3DE, 2D-STI, and LASI enables effective evaluation of left atrial structure and function changes in patients with VAF. LASI provides a more accurate indication of the extent of myocardial fibrosis.

CLINICAL TRIAL NUMBER

Not applicable.

The role of multi-modality imaging for the assessment of left atrium and left atrial appendage: a clinical consensus statement of the European Association of Cardiovascular Imaging (EACVI), European Heart Rhythm Association (EHRA) of the European Society of Cardiology (ESC)

Structural, architectural, contractile, or electrophysiological alterations may occur in the left atrium (LA). The concept of LA cardiopathy is supported by accumulating scientific evidence demonstrating that LA remodelling has become a cornerstone diagnostic and prognostic marker. The structure and the function of the LA and left atrial appendage (LAA), which is an integral part of the LA, are key elements for a better understanding of multiple clinical conditions, most notably atrial fibrillation, cardioembolism, heart failure, and mitral valve diseases. Rational use of various imaging modalities is key to obtain the relevant clinical information. Accordingly, this clinical consensus document from the European Association of Cardiovascular Imaging, in collaboration with the European Heart Rhythm Association, provides comprehensive, up-to-date, and evidence-based guidance to cardiologists and cardiac imagers for the best practice of imaging LA and LAA for the diagnosis, management, and prognostication of the patients.

Incremental diagnostic and prognostic utility of left atrial deformation in heart failure using speckle tracking echocardiography

Left atrium (LA) is a very important component of cardiovascular performance. The assessment of LA function has gathered the interest with expanding research supporting the utility as a biomarker for outcomes in heart failure (HF). Echocardiography is the main imaging modality which helps in a qualitative and quantitative assessment of the LA size and function. Recent advances in probe technology and software analysis have provided a better understanding of LA anatomy, physiology, pathology, and function. A variety of parameters have been defined as markers of LA function but there is no single parameter that best defines LA function. Speckle tracking echocardiography-derived analysis of LA deformation provides a window on all phases of LA function (reservoir, conduit, and booster pump). There is accumulative published data that supported the diagnostic and prognostic values of LA deformation integration during echo assessment of LA in HF. This review article summarized the clinical utility of LA deformation that may help in prediction, diagnosis, categorization, risk stratification, and guiding the proper selection of therapy in HF patients in daily practice.

Potential Diagnostic and Prognostic Values of Left Atrial Strain in Valvular Heart Disease

There has been increasing evidence supporting the importance of left atrial (LA) functional analysis and measurement in various physiologic and pathologic cardiovascular conditions due to its high diagnostic and prognostic values. Assessment of LA strain (LAS) has emerged as an early marker of subclinical LA dysfunction. Using speckle-tracking echocardiography, LAS can be measured in all phases of LA function (reservoir, conduit, and booster pump). In valvular heart disease (VHD), surgical and nonsurgical interventions should be performed before irreversible left ventricular (LV) and/or LA myocardial dysfunction. The current guidelines recommended using LV strain as a parameter for early detection and timely intervention. Currently, many published data have shown the diagnostic and prognostic values of LAS in VHD, which is encouraging to integrate LAS during echo assessment. In this review, we aim to collect the current data about the clinical utility of LAS changes in risk stratification, predicting outcome, and guiding the time of intervention in VHD. The review summarized these data according to the type of valve pathologies.

Reproducibility of transthoracic 3D echocardiography in the assessment of mitral valve area in patients with rheumatic mitral stenosis: real time versus ECG-gated 3D echocardiography

PURPOSE

To assess reproducibility of Real time 3D echocardiography (RT3D) and ECG-gated 3D echocardiography (EG3D) when measuring the mitral valve area (MVA) in rheumatic mitral stenosis (MS).

METHODS

MVA was assessed by three operators in 68 MS patients using RT3D and EG3D. Reproducibility of each technique was determined by calculating the standard error of measurements (SEM).

RESULTS

SEM was similar between RT3D and EG3D. MVA variability was of 0.4 cm² or 30% of any RT3D or EG3D measured MVA. The minimal change in MVA above which two measurements should be considered to differ significantly for the same operator was of 0.4 cm² for RT3D and 0.5 cm² for EG3D. For two different operators making successive measurements, the minimum significant change was of 0.5 cm² for RT3D and 0.6 cm² for EG3D. The minimum significant difference when switching from RT3D to EG3D or vice versa is of 0.6 cm². Low temporal resolution of 6 Hz has the least variability when using RT3D (0.19 cm² vs. 0.26 cm², p = 0.009) but significantly underestimated MVA (1.3 ± 0.4 cm² vs. 1.4 ± 0.4 cm², p < 10- 3) when compared to EG3D. MVA variability was significantly higher in mild MS when compared to severe MS whether it is RT3D (0.23 cm² vs. 0.18 cm², p = 0.02) or EG3D (0.27 cm² vs. 0.16 cm², p < 0.001).

CONCLUSION

RT3D and EG3D are equally reproducible in the assessment of MVA in patients with MS. Further measurements standardization is required to have a clinically acceptable estimations of the true 3D MVA and minimal detectable differences.

Atrial Cardiomyopathy in Valvular Heart Disease: From Molecular Biology to Clinical Perspectives

This review discusses the evolving topic of atrial cardiomyopathy concerning valvular heart disease. The pathogenesis of atrial cardiomyopathy involves multiple factors, such as valvular disease leading to atrial structural and functional remodeling due to pressure and volume overload. Atrial enlargement and dysfunction can trigger atrial tachyarrhythmia. The complex interaction between valvular disease and atrial cardiomyopathy creates a vicious cycle of aggravating atrial enlargement, dysfunction, and valvular disease severity. Furthermore, atrial remodeling and arrhythmia can predispose to atrial thrombus formation and stroke. The underlying pathomechanism of atrial myopathy involves molecular, cellular, and subcellular alterations resulting in chronic inflammation, atrial fibrosis, and electrophysiological changes. Atrial dysfunction has emerged as an essential determinant of outcomes in valvular disease and heart failure. Despite its predictive value, the detection of atrial fibrosis and dysfunction is challenging and is not included in the clinical routine. Transthoracic echocardiography and cardiac magnetic resonance imaging are the main diagnostic tools for atrial cardiomyopathy. Recently published data have revealed that both left atrial volumes and functional parameters are independent predictors of cardiovascular events in valvular disease. The integration of atrial function assessment in clinical practice might help in early cardiovascular risk estimation, promoting early therapeutic intervention in valvular disease.